High Yield Overview

MENISCAL REPAIR - ALL-INSIDE AND INSIDE-OUT TECHNIQUES

Arthroscopic via standard anterolateral viewing and anteromedial working portals. Additional posteromedial safety incision for inside-out medial repairs. All-inside technique uses implantable devices requiring only standard portals. | intermediate

Critical Danger Structures - 5 Specific Anatomical Zones

Popliteal Artery

Location: 1cm posterior to posterior capsule at level of PCL, courses through popliteal fossa medially

Risk: Penetration during posterior horn repairs if needles/devices directed >10mm posteriorly through capsule

Protection: Maintain knee flexion 70-90° during posterior horn repair (relaxes posterior structures), limit needle/device depth to <10mm past capsule, direct needles horizontally not posteriorly, use blunt retractor for inside-out technique

Injury Recognition: Pulsatile bleeding, expanding hematoma, loss of distal pulses - requires immediate vascular surgery consultation

Popliteal Vein

Location: Adjacent and lateral to popliteal artery in popliteal fossa, courses with artery

Risk: Similar to artery - penetration during posterior horn repairs, may be injured even if artery spared

Protection: Same precautions as popliteal artery - controlled depth, appropriate knee flexion, horizontal needle direction

Injury Recognition: Rapid hemarthrosis, non-pulsatile bleeding, may not be immediately apparent - monitor for post-operative swelling and compartment syndrome

Saphenous Nerve

Location: Descends 1-2cm posterior to MCL at joint line level, emerges between sartorius and gracilis tendons, travels with great saphenous vein superficial to deep fascia

Risk: 1-5% injury rate during inside-out medial meniscal repair despite retractor use, highest risk if incision placed >2cm posterior to MCL or retractor inadequate

Protection: Vertical posteromedial incision exactly 1cm posterior to MCL (palpate MCL edge), blunt retractor between capsule and neurovascular structures during needle passage, pass needles close to capsule not deep, palpate retractor position continuously

Injury Recognition: Immediate medial leg numbness, dysesthesia, burning pain - often permanent, no effective treatment, devastating for patients despite "minor" sensory nerve

Common Peroneal Nerve

Location: Wraps around fibular neck 2-3cm distal to joint line laterally, very superficial in subcutaneous tissue at risk zone

Risk: Injury during lateral meniscal inside-out repair (rarely performed for this reason), also at risk from lateral portal placement if too inferior

Protection: Inside-out lateral repair rarely performed - if necessary, make incision at joint line not distal, use retractor, pass needles horizontally. All-inside technique preferred for lateral repairs. Lateral portals placed at joint line level, not distal.

Injury Recognition: Foot drop, inability to dorsiflex ankle/extend toes, sensory loss dorsal foot - devastating motor injury requiring immediate decompression if acute compression, otherwise observation/bracing

Great Saphenous Vein

Location: Runs with saphenous nerve posteromedially, 1-2cm posterior to MCL, superficial to deep fascia

Risk: Transection during posteromedial incision for inside-out repair or by needles if retractor inadequate

Protection: Careful dissection during posteromedial incision identifying vein early, protect with retractor during needle passage

Injury Recognition: Bleeding from incision, post-operative hematoma formation, ecchymosis tracking down medial leg - usually managed conservatively with compression but may require evacuation if large

Mnemonic

REPAIR - Meniscal Repair Indications

Mnemonic

DANGERS - Neurovascular Structures at Risk

Ideal Candidates for Meniscal Repair

Age and Activity Level

Young patients <40 years (healing potential highest)
Active lifestyle with desire to return to sport/demanding activities
Motivated for extended rehabilitation (4-6 months vs 6-12 weeks for meniscectomy)
Understanding that repair has 10-20% failure risk requiring possible meniscectomy

Tear Characteristics - Critical Selection Criteria

Zone (Vascularity) - Most important factor:

Red-red zone (outer 0-3mm): Excellent vascularity, 90-95% healing, ideal for repair
Red-white zone (3-5mm from periphery): Moderate vascularity, 80-85% healing with ACL, reasonable for repair
White-white zone (inner >5mm): Avascular, <40% healing, generally NOT repairable (except with augmentation)
Assessment: Look for bleeding from tear edges (indicates red zone), measure distance from meniscocapsular junction with probe

Tear Pattern:

Vertical longitudinal: Best pattern for repair (oriented parallel to collagen fibers), 80-90% healing
Bucket-handle: Complete vertical longitudinal with displacement, excellent if reducible, 85-90% healing
Radial tear at root insertion: Specialized repair technique (pullout sutures to bone), 70-80% healing
Horizontal cleavage: Generally NOT repaired (degenerative), consider partial meniscectomy
Complex/degenerative: NOT repairable, meniscectomy
Radial mid-substance: Generally NOT repaired (poor healing due to perpendicular collagen orientation), meniscectomy

Tear Length and Stability:

Length >10mm: Sufficient for repair with multiple fixation points (4-5mm spacing)
Length <10mm: May heal spontaneously if stable, or single device sufficient
Unstable tear: Displacement >3mm with probing indicates need for repair
Stable tear: May observe if <10mm, acute, red-red zone

Tear Acuity:

Acute <12 weeks: Fresh tissue, good healing potential, 85-90% healing
Subacute 12 weeks to 6 months: Reasonable healing, 75-85% with ACL
Chronic >6 months: Poorer healing 60-70%, consider augmentation (trephination, PRP)

Tissue Quality:

Good quality: Firm, red appearance, bleeding edges, no fraying - proceed with repair
Poor quality: Degenerative, frayed, white/gray appearance, no bleeding - meniscectomy
Cannot assess quality until arthroscopy - intra-operative decision required

Associated ACL Reconstruction:

Concurrent ACL dramatically improves healing: 60-70% isolated to 80-90% with ACL
Mechanism: Blood and growth factors from tunnel drilling
Makes borderline tears (red-white, questionable tissue, chronic) much better candidates
40-50% of ACL tears have associated meniscal tears - always examine both menisci systematically

Contraindications - When to Perform Meniscectomy

Absolute:

White-white zone location (avascular, won't heal)
Degenerative complex tear (macerated tissue, multiple planes)
Unreducible tear (cannot restore anatomy)
Active infection

Relative:

Age >50 years (lower healing potential, lower demand)
Sedentary lifestyle (repair benefit reduced)
Chronic tear >12 months with poor tissue quality
Radial mid-substance tear (poor healing due to collagen orientation)
Previous failed repair (revision repair has lower success 50-70%)
Patient unable/unwilling to comply with extended rehabilitation

Decision-Making Framework

High priority for repair (80-90% success):

Red-red zone, vertical longitudinal, acute <12 weeks, age <30, concurrent ACL, good tissue

Reasonable for repair (70-80% success):

Red-white zone, bucket-handle, subacute <6 months, age 30-40, concurrent ACL

Borderline for repair (60-70% success):

Red-white zone, chronic, age 40-50, no ACL - consider augmentation (trephination)

Not suitable for repair (<40% success):

White-white zone, degenerative, complex, radial mid-substance, age >50 - perform meniscectomy

Counseling Patients

Benefits of repair vs meniscectomy:

Preserves meniscal function (shock absorption, load distribution, joint stability)
Reduces long-term OA risk (meniscectomy increases OA 5-10x at 10-20 years)
Lateral meniscectomy worse than medial (>200% vs >50% contact pressure increase)
Even partial meniscectomy accelerates cartilage degeneration

Trade-offs of repair:

Extended rehabilitation 4-6 months vs 6-12 weeks for meniscectomy
ROM restriction controversial (0-90° for 4-6 weeks traditional vs full ROM modern)
10-20% failure risk requiring possible later meniscectomy
Slightly higher complication risk (neurovascular injury 1-5% for inside-out)
Additional cost for all-inside devices ($500-800 per device)

Expected outcomes:

80-90% healing with concurrent ACL reconstruction at 2-5 years
60-70% healing for isolated repair without ACL
If failure occurs, typically within first year (70-80% of failures)
Failed repair can still undergo meniscectomy - no harm trying if criteria met
Return to sport 4-6 months minimum (vs 6-12 weeks for meniscectomy)

Step-by-Step Operative Technique

Step 1: Diagnostic Arthroscopy & Tear Assessment

Systematic diagnostic arthroscopy via standard anterolateral viewing portal and anteromedial working portal. Examine: suprapatellar pouch, patellofemoral joint, medial gutter, medial meniscus (posterior horn, body, anterior horn with probe), lateral gutter, lateral meniscus, intercondylar notch (ACL/PCL), chondral surfaces all compartments. Assess meniscal tear comprehensively: Location (posterior horn/body/anterior horn), Zone (red-red/red-white/white-white based on distance from periphery and vascularity - look for bleeding edges indicating red zone), Pattern (vertical longitudinal, bucket-handle, radial, horizontal, complex, degenerative), Length (measure with arthroscopic ruler or probe - need >10mm for repair), Stability (probe test - displacement >3mm indicates unstable tear requiring repair), Tissue quality (firm/friable, vascular/avascular, acute/degenerative appearance), Reducibility (can displaced fragment be restored to anatomic position). Document thoroughly with photos and measurements.

Exam Pearl

Technical Tip: EXAM KEY - Systematic tear assessment determines repairability. I evaluate zone (vascularity) by observing for bleeding from tear edges and measuring distance from meniscocapsular junction with probe - red-red zone (outer 0-3mm) has active bleeding and 90-95% healing; red-white zone (3-5mm) may have minimal bleeding with 80-85% healing with ACL; white-white zone (inner >5mm) has no bleeding and <40% healing without augmentation. I assess pattern - vertical longitudinal and bucket-handle are favorable (oriented with collagen fibers) with 80-90% healing; radial mid-substance is unfavorable (<40%) due to perpendicular orientation. I probe the tear to assess stability and reducibility - must be able to restore anatomic position with probe for successful repair. Concurrent ACL reconstruction improves healing dramatically (60-70% to 80-90%) making borderline tears better candidates.

Dangers at this step

Inadequate assessment leading to inappropriate meniscectomy - missing repairable tear removes meniscus unnecessarily increasing long-term OA risk 5-10x
Overestimating repairability - attempting repair of white-white zone degenerative tear leads to failure and patient dissatisfaction
Missing concurrent ACL injury - affects decision-making and healing potential significantly
Iatrogenic chondral damage during probing - use gentle technique to avoid creating new pathology
Misidentifying tear pattern - complex degenerative tears are NOT repairable despite potentially appearing as vertical longitudinal

Step 2: Tear Preparation & Debridement

Prepare tear edges to create optimal healing environment. Using arthroscopic shaver at low speed or motorized burr, gently debride any frayed or degenerated tissue from tear edges while preserving maximum meniscal substance (unlike meniscectomy where goal is removal - here goal is minimal debridement). Use meniscal rasp (hand instrument with small teeth) to abrade both sides of tear creating raw bleeding surfaces - this is critical as healing depends on bleeding surface apposition. Use rasp on peripheral capsular surface of meniscus to enhance vascular supply from meniscocapsular junction - gentle multiple passes create punctate bleeding. For bucket-handle tears, reduce displaced fragment back to anatomic position using probe or grasper - may require flexion/extension and varus/valgus stress to achieve reduction. Assess reduction stability - fragment should stay reduced without constant pressure. If cannot achieve stable reduction, tear is not suitable for repair. Create bleeding surface but preserve tissue - excessive debridement defeats purpose of repair.

Exam Pearl

Technical Tip: EXAM KEY - Tear preparation is critical for healing success. I use meniscal rasp to abrade tear edges and peripheral capsule creating bleeding surface - this brings vascularity and healing cells to avascular tear site. The rasp creates controlled micro-trauma without removing tissue. I minimize shaver use (only for obviously frayed tissue) because excessive debridement removes meniscal substance reducing function. For bucket-handle tears, achieving anatomic reduction is essential - I manipulate the knee into flexion/extension and varus/valgus while using probe to guide fragment back to normal position. If reduction cannot be maintained with probe alone, the tear likely has associated tissue damage making repair less favorable. Healing depends on: bleeding surface contact, vascularity, anatomic reduction, stable fixation.

Dangers at this step

Excessive debridement removing too much meniscus - defeats purpose of repair which is to preserve meniscal function
Inadequate abrading resulting in poor healing surface - smooth non-bleeding edges will not heal together
Cannot achieve stable reduction in bucket-handle tear - contraindication to repair, should consider meniscectomy
Damage to articular cartilage from shaver or rasp - use controlled technique and protect cartilage
Creating unstable meniscal remnant - excessive debridement may destabilize even if repair successful

Step 3: All-Inside Repair Technique (Most Common Current Practice)

Select all-inside device based on tear location and surgeon preference (Fast-Fix, FiberStitch, Sequent, Omnispan, etc. - all have similar results). Insert device through working portal (anteromedial for medial meniscus, anterolateral for lateral meniscus). Position device across tear perpendicular to meniscal surface - this is critical for proper anchor deployment. Deploy first anchor on capsular (peripheral/inferior) side of tear - advance device trigger to release anchor which should deploy OUTSIDE joint capsule (confirm arthroscopically by switching portals). Advance device across tear to opposite (central/superior) side. Deploy second anchor on central side of tear. Tensioning mechanism pulls anchors together compressing tear - some devices have adjustable tension, others pre-set. Remove device deployment system. Verify both anchors properly positioned OUTSIDE joint and tear edges well-approximated. Repeat device insertion for additional fixation points along tear length - typical spacing 4-5mm between devices. For 15mm tear, use 3-4 devices; for 25mm tear, use 5-6 devices. Too few devices (spacing >5mm) results in inadequate compression and healing failure. Visualize from opposite portal to confirm capsular anchor deployment and no intra-articular implant. Test repair stability with probe - should resist moderate force without gapping.

Exam Pearl

Technical Tip: EXAM KEY - All-inside technique has become my preferred method for most meniscal repairs due to equivalent healing rates (80-90% with ACL) without accessory incision and neurovascular risk. Critical technical points: (1) Ensure anchors deploy OUTSIDE joint capsule not inside - switch portals to visualize capsular side and confirm anchor position outside joint; intra-articular anchor causes chondral damage and failure. (2) Maintain device perpendicular to meniscal surface during deployment - angled deployment causes anchor malposition. (3) Adequate number of devices - I place device every 4-5mm along tear (closer spacing provides better compression); insufficient devices is common technical error leading to failure. (4) Verify compression - tear edges should be in contact with <1mm gap; visible gap indicates failure risk. Main limitations: Implant cost ($500-800 per device, need 3-6 devices typically = $1500-4000), difficult access to far posterior horn (>10mm posterior to PCL), implant complications (migration/prominence 2-5%).

Dangers at this step

Anchor deployment inside joint space - CRITICAL ERROR causing chondral damage, loose body, catching, pain; requires device removal and re-repair; prevented by confirming capsular deployment from opposite portal before advancing
Incomplete anchor deployment - device failure with anchor not fully released; cannot provide fixation; must remove and replace device
Too few devices or excessive spacing (>5mm) - inadequate compression leads to gap >1mm and healing failure; need device every 4-5mm along tear
Anchor penetration through capsule injuring neurovascular structures - rare but reported; usually saphenous nerve (medial) or peroneal nerve (lateral); prevented by controlled anchor deployment depth
Device breakage during deployment - rare with modern devices; requires removal of broken components and replacement; maintain smooth trigger activation

Step 4: Inside-Out Repair Technique (For Posterior Horn or Revision)

Create posteromedial safety incision for medial meniscal repair: 3-4cm vertical incision positioned exactly 1cm posterior to palpable MCL at joint line level (mark MCL edge with skin marker before incision). Dissect through subcutaneous tissue carefully identifying and protecting great saphenous vein and saphenous nerve (usually travel together 1-2cm posterior to MCL). Incise deep fascia longitudinally. Blunt dissection down to joint capsule. Insert curved blunt retractor (Army-Navy or custom meniscal repair retractor) between capsule and neurovascular structures - this protects saphenous nerve during needle passage. Palpate retractor position to confirm covering neurovascular zone. Inside knee: Insert meniscal repair needle system through cannula in working portal. Using straight or curved cannulated needles (choose based on tear location and access angle) pre-loaded with 2-0 non-absorbable suture (Ethibond preferred), pass needle from inside knee through meniscal tear (penetrate meniscus 3-4mm from tear edge on both sides), through capsule, exiting at posteromedial incision OVER the protective retractor. Advance needle completely until tip visible outside. Repeat needle passage for additional sutures - typically place 2-4 sutures depending on tear length at 4-5mm spacing. Outside incision: Retrieve all needle tips ensuring they exited safely over retractor. Secure sutures using tying posts or pass ends through small capsular drill holes and tie directly over capsule. Tie sutures with knee flexed 30-40° to avoid over-compression. Cut suture tails. Remove retractor. Test repair stability arthroscopically.

Exam Pearl

Technical Tip: EXAM KEY - Inside-out is historical gold standard with longest follow-up data (85-90% healing at 5-10 years) and I use for far posterior horn tears where all-inside access is difficult, or for revision repairs. Critical safety: Posteromedial incision MUST be exactly 1cm posterior to MCL (more posterior increases nerve injury risk); I palpate and mark MCL edge before incision. Blunt retractor between capsule and neurovascular structures is mandatory but does NOT eliminate nerve injury risk (still 1-5% injury rate). I ensure needles pass close to capsule (not deep where vessels are) and exit over retractor by palpating retractor continuously and checking needle tips as they emerge. I tie sutures over capsule (not just tying posts) for stronger fixation. Multiple sutures at close spacing (4-5mm) provide better compression than single suture. Lateral inside-out rarely performed due to common peroneal nerve wrapping around fibular neck - all-inside preferred for lateral tears.

Dangers at this step

Saphenous nerve injury - occurs in 1-5% despite retractor protection; incision >2cm posterior to MCL increases risk; injury causes permanent medial leg numbness/dysesthesia; no effective treatment; devastating despite "minor" sensory nerve
Inadequate neurovascular protection - retractor must be positioned between capsule and nerve/vein; palpate retractor continuously during needle passage; if needle does not exit over retractor, at high risk for nerve injury
Needles directed too posteriorly - penetrating deep to capsule toward popliteal vessels (1cm posterior to capsule); catastrophic vascular injury though rare; maintain horizontal needle direction not posterior angulation
Great saphenous vein injury - causes hematoma; usually managed conservatively but may require evacuation
Sutures too far apart (>5mm spacing) - inadequate compression results in gap >1mm and healing failure; need close spacing for good compression

Step 5: Implant Verification & Repair Assessment

After completing all-inside device deployment or inside-out suture passage, meticulously verify repair quality before concluding procedure. Switch between viewing portals (view from anterolateral and anteromedial) to visualize repair from both sides. For all-inside repairs: Confirm all anchors deployed OUTSIDE joint capsule on meniscocapsular junction - see anchor footprint on capsular side, no anchors visible intra-articularly. Verify no protruding implants or suture loops in joint. Check tear edges well-approximated with <1mm gap throughout length. For inside-out repairs: Ensure all needles exited at posteromedial incision safely over retractor. Verify sutures not twisted or caught on other structures. Arthroscopically confirm sutures visible on capsular side compressing tear. Assess meniscal reduction: Displaced fragments (bucket-handle) restored to anatomic position with smooth meniscal contour. Test stability: Probe repair gently then progressively with more force - well-fixed repair should resist moderate probing without gapping >1mm. Move knee through ROM: Full extension to 120° flexion - repair should remain stable without impingement or catching. Check for pulsatile bleeding suggesting arterial injury (rare but critical to identify). Document repair quality with arthroscopic photos from multiple portals showing pre-repair tear, repair configuration, final result.

Exam Pearl

Technical Tip: EXAM KEY - Verification is critical because technical errors (intra-articular anchor, inadequate compression) if not corrected immediately will lead to early failure. I systematically verify from BOTH portals: (1) Anterolateral view shows meniscal surface and tear approximation; (2) Anteromedial view (for medial meniscus) or anterolateral view (for lateral meniscus) allows visualization of capsular side confirming anchors outside joint. Cannot adequately assess from single portal - must switch. I probe the repair testing stability - stable repair resists moderate force; if probe easily gaps tear >1mm, fixation is inadequate requiring additional device or re-repair. I look for well-approximated edges with good compression - visible gap indicates healing failure risk. ROM testing: Repair should remain stable through full motion; if impingement or loss of motion occurs, repair may be over-compressed or mal-positioned requiring revision. Any concern about implant position mandates device removal and replacement - cannot accept suboptimal repair.

Dangers at this step

Implant inside joint space - causes chondral damage, catching, pain; requires removal; prevented by viewing from opposite portal before completing repair
Inadequate compression with gap >1mm between tear edges - indicates likely healing failure; must place additional device or revise technique immediately
Missed neurovascular injury - check for pulsatile bleeding suggesting arterial penetration (rare but catastrophic); non-pulsatile rapid hemarthrosis suggests venous injury
Accepting unstable repair - probe testing showing easy gapping indicates fixation failure; will fail early; should revise immediately rather than accept poor quality
Loss of motion - repair should not limit ROM; restriction suggests impingement or over-compression requiring revision

Step 6: Biological Augmentation (Selective Use for High-Risk Tears)

Consider biological augmentation for tears with suboptimal healing potential - NOT routine for standard red-red or red-white zone tears with ACL reconstruction. Trephination (marrow venting) technique: Using 1-2mm drill bit or awl, create 2-3 small channels from peripheral meniscus perpendicular to tear plane reaching subchondral bone of tibial plateau. Channels allow bone marrow blood and stem cells to reach tear site. Typically drill through meniscus 5-10mm from tear site to access bone. Observe marrow bleeding from channels ("marrow venting"). Indications: White-white zone tears (normally unrepairable), chronic tears >6 months, revision repairs, tears without concurrent ACL. Evidence mixed - some studies show improved healing from 40% to 60-70%, others no benefit. Fibrin clot technique: Draw 10-20ml patient blood in sterile syringe, create clot by gentle agitation, place clot in tear gap before fixation providing scaffold for cell migration. Historically used extensively but now less common with modern compression devices. PRP injection: Inject platelet-rich plasma (prepared from patient blood via centrifugation) into repaired tear site at surgery conclusion. Contains growth factors (PDGF, TGF-β, VEGF) theoretically promoting healing. Limited evidence - small studies suggest possible benefit, no large RCTs. I use trephination selectively for borderline tears (white-white zone that patient insists on attempting repair, chronic >6 months without ACL, revision). I do not use PRP routinely (unproven benefit, additional cost).

Exam Pearl

Technical Tip: EXAM KEY - For standard red-red or red-white zone tears with concurrent ACL reconstruction, biological augmentation is NOT necessary as baseline healing rate is 80-90%. I consider augmentation for higher-risk scenarios where baseline healing is 40-60%: white-white zone location (normally unrepairable), chronic tear >6 months without ACL, revision repair, isolated repair in older patient. Trephination is my preferred augmentation - creates channels from tear to vascularized bone allowing marrow elements to reach avascular zone. Technique: 1-2mm drill bit, 2-3 channels spaced 5mm apart, perpendicular to tear, reaching subchondral bone. Evidence is limited but suggests possible improvement from ~40% to 60-70% healing. Over-reliance on augmentation is mistake - cannot salvage truly unrepairable tears (degenerative complex, massive tissue loss). Most important healing factors remain: vascular zone, tear pattern, patient age, concurrent ACL - augmentation cannot overcome poor fundamentals.

Dangers at this step

Over-reliance on augmentation for inappropriate tears - cannot salvage white-white zone degenerative complex tears; augmentation may marginally improve healing but cannot overcome poor fundamentals
Excessive trephination creating too many or large holes - weakens meniscal structure; limit to 2-3 small 1-2mm channels
PRP/biological injections without evidence - increased cost and complexity without proven benefit in routine cases; I avoid unless research protocol
Delaying appropriate meniscectomy - attempting repair of truly unrepairable tear with augmentation gives false hope; better to perform meniscectomy if clearly not suitable
Drilling through articular cartilage - trephination must access bone through peripheral meniscus not through cartilage

Step 7: Concurrent ACL Reconstruction (Common Scenario)

When meniscal repair performed with concurrent ACL reconstruction: Complete meniscal repair FIRST before ACL reconstruction. Rationale: Better visualization with intact ACL, no graft to avoid during meniscal work, can assess meniscal stability before ACL reconstruction. Alternative approach: Some surgeons perform ACL first for knee stability during meniscal probing - valid but I prefer meniscal repair first. After meniscal repair verification, proceed with ACL reconstruction: Femoral and tibial tunnel drilling/reaming, graft passage, fixation using standard technique. The ACL reconstruction process (drilling, reaming, bone debris) creates blood flow and growth factors that enhance meniscal healing - this is well-established effect improving healing from 60-70% isolated to 80-90% with ACL. Mechanism: Bone marrow elements (blood, stem cells, growth factors including BMPs, TGF-β, PDGF) from tunnel drilling reach meniscal tear via hemarthrosis and synovial circulation. Effect is so significant that borderline tears (red-white zone, chronic, questionable tissue quality) become much better candidates with concurrent ACL. During ACL graft passage and fixation, protect meniscal repair - avoid excessive force that might disrupt repair. After ACL reconstruction completion, re-examine meniscal repair to ensure still stable. 40-50% of ACL tears have associated meniscal tears (medial posterior horn most common pattern) - always examine both menisci systematically during ACL surgery.

Exam Pearl

Technical Tip: EXAM KEY - Concurrent ACL reconstruction is single strongest predictor of meniscal repair success, improving healing from 60-70% to 80-90%. This makes tears that might be borderline for isolated repair (red-white zone, chronic >6 months, questionable tissue quality) much better candidates with ACL. I have low threshold for attempting repair during ACL surgery. I counsel patients: Meniscal repair adds 15-20 minutes to surgery and requires extended rehab (4-6 months vs 3-4 months for isolated ACL) but preserves meniscal function long-term. Even if repair fails (10-20% risk), delayed meniscectomy has similar outcomes to primary meniscectomy, so no harm in attempting. Meniscectomy accelerates cartilage degeneration even with stable ACL reconstruction - medial meniscectomy increases contact pressure >50%, lateral >200%. During ACL surgery, I always examine both menisci systematically - approximately 40-50% have tears requiring decision about repair vs meniscectomy vs observation.

Dangers at this step

Missing meniscal tear during ACL surgery - failure to systematically examine both menisci means potentially repairable tear gets missed; later presents as post-ACL pain
Inappropriate meniscectomy - removing repairable meniscus during ACL surgery worsens long-term outcomes; ACL effect makes repair more favorable
Damage to meniscal repair during ACL reconstruction - graft passage and fixation can disrupt repair if not careful; protect repair during subsequent steps
Not counseling about extended rehabilitation - meniscal repair requires 4-6 months protected ROM vs 3-4 months for isolated ACL; patient must understand trade-off
Over-aggressive early rehab - ACL protocols often emphasize early ROM but meniscal repair may require restriction; individualize protocol

Step 8: Final Assessment & Comprehensive Documentation

Perform systematic final assessment before concluding procedure: (1) Repair integrity - all sutures/anchors secure, no loose devices, no broken implants; (2) Tear approximation - edges in contact with <1mm gap throughout length; (3) Stability testing with probe - resist moderate force without gapping; (4) ROM testing - knee through full passive extension to >120° flexion without repair impingement, catching, or loss of motion; (5) Meniscal reduction - displaced fragments (bucket-handle) anatomically reduced with smooth contour; (6) No loose bodies - no implants, debris, or broken instruments in joint; (7) Other compartments - re-examine medial/lateral compartments and patellofemoral joint for iatrogenic injury; (8) Hemostasis - no active bleeding, no pulsatile bleeding suggesting vascular injury. Document meticulously with arthroscopic photographs: Pre-repair tear (multiple views showing location, zone, pattern), repair configuration (fixation points, technique used, device type/number), final result (tear approximation, meniscal reduction). Operative note documentation: Tear characteristics (location: posterior horn/body/anterior horn; zone: red-red/red-white/white-white with distance from periphery; pattern: vertical longitudinal/bucket-handle/radial; length: measured in mm; stability: unstable/stable); tissue quality (good/fair/poor; vascular/avascular); repair technique (all-inside specific devices and number, or inside-out number of sutures); concurrent procedures (ACL reconstruction); post-op plan (ROM restrictions, weight-bearing, brace use, rehab protocol). This documentation is critical for follow-up management if symptoms recur - knowing exact repair configuration helps assess for failure vs new tear.

Exam Pearl

Technical Tip: EXAM KEY - Thorough final assessment prevents technical errors from being missed. I systematically verify: stability (probe test should show solid repair), ROM (full extension to >120° flexion without catching - limited ROM indicates problem), tear approximation (<1mm gap predicts healing), no intra-articular implants (causes chondral damage). I document extensively with photos and detailed operative note. This is important because if patient has symptoms at 3-6 months follow-up, I need to know: exact tear location and repair configuration to determine if symptoms represent failure at repair site vs new tear elsewhere; technique used (affects interpretation of MRI findings); baseline tissue quality (poor quality may have been marginal for repair, lower threshold for accepting failure). Testing stability: gentle probe test first (should be stable), then progressively more force (well-fixed repair resists moderate force). Testing ROM: Repair should NOT limit motion - if flexion <120° or extension lacking, suggests impingement or over-compression requiring revision immediately.

Dangers at this step

Inadequate documentation - makes follow-up management difficult if symptoms recur; cannot determine if failure, new tear, or unrelated pathology without knowing baseline
Loss of motion - meniscal repair should not limit ROM; restriction suggests impingement, over-compression, or associated pathology requiring revision
Accepting unstable repair - probe test showing easy gapping indicates fixation failure; will fail early; should revise immediately rather than hope for healing
Missing concurrent pathology - always re-examine all compartments after repair; easy to focus on meniscal repair and miss chondral damage, other meniscal tear, loose body
Not testing ROM - assuming ROM will be normal without checking; limitation may require revision or indicate technical problem

Step 9: Irrigation, Closure & Post-operative Immobilization

Copious arthroscopic irrigation with 2-3 liters normal saline via arthroscopic pump to remove blood, debris, and inflammatory mediators (reduces post-operative synovitis and pain). Inject intra-articular local anesthetic for post-operative pain control: 20ml 0.25% marcaine (bupivacaine) with epinephrine 1:200,000 into joint and portal sites (lasts 6-12 hours, reduces immediate post-op pain significantly). For inside-out repairs: Close posteromedial incision in layers to prevent hematoma and wound complications: (1) Capsule with 2-0 absorbable suture (Vicryl) - interrupted or running; (2) Deep fascia with 2-0 Vicryl; (3) Subcutaneous tissue with 3-0 Vicryl - minimize dead space; (4) Skin with 3-0 monocryl subcuticular or 3-0/4-0 nylon interrupted or staples. Meticulous hemostasis in layers. For all-inside repairs: No incision beyond portals. Close arthroscopic portals: Single 3-0 or 4-0 nylon interrupted suture each portal (anterolateral, anteromedial). Apply sterile dressing: Gauze over portals/incisions, elastic bandage compression dressing (reduces swelling), or bulky dressing. Apply cryotherapy device if available (reduces pain and swelling). Post-operative immobilization (CONTROVERSIAL - surgeon-dependent): Traditional approach: Hinged knee brace locked in extension for ambulation, unlock to 0-90° for sleep and early exercises - continue 4-6 weeks for large posterior horn tears. Modern approach: No brace, or brace unlocked 0-90° immediately allowing controlled ROM from day 1. My approach: Individualize based on tear pattern and repair stability - large posterior horn tear (>15mm, far posterior) gets brace with 0-90° ROM restriction for 4-6 weeks; small/moderate body or anterior horn tear (<15mm, good stability) gets no brace or early ROM unrestricted.

Exam Pearl

Technical Tip: EXAM KEY - Thorough irrigation reduces inflammatory response and post-op pain. I inject 20ml 0.25% marcaine with epinephrine intra-articularly and into portals - this provides excellent immediate post-op analgesia (6-12 hours) allowing patient comfort and early exercises. For inside-out repairs, meticulous layered closure of posteromedial incision is important to prevent hematoma (which can cause pain, nerve irritation, infection risk) - I ensure hemostasis at each layer and close deep fascia separately from subcutaneous. Portal closure prevents synovial fistula formation (rare but problematic if occurs). Post-operative bracing is controversial area with mixed evidence. Traditional teaching: restrict ROM to 0-90° for 4-6 weeks to protect repair during healing (based on biomechanical data showing meniscal stress increases >90° flexion). Modern challenge: RCTs show no difference in healing between restricted vs unrestricted ROM. I individualize: Large posterior horn tears where I have concern about stability get 0-90° brace for 4-6 weeks; smaller tears with excellent stability after repair get full ROM immediately. All patients avoid deep flexion/squatting until 4-6 months regardless of brace use.

Dangers at this step

Inadequate irrigation - increased post-operative synovitis, pain, and potentially adhesion formation
Poor closure of inside-out incision - hematoma formation (painful, infection risk, nerve irritation), wound dehiscence
Synovial fistula from portals - persistent drainage from portal sites; prevented by proper portal closure with suture; if occurs, requires secondary closure
Over-aggressive early ROM without individualization - theoretical risk of repair disruption for large unstable posterior horn tears; safe approach is to restrict ROM for concerning tears
Too conservative ROM restriction unnecessarily - causes stiffness without benefit for small stable tears; need to balance protection vs mobility

Step 10: Post-operative Instructions & Rehabilitation Protocol

Provide detailed post-operative instructions to patient and physiotherapist (critical for success as meniscal repair requires PROTECTED rehabilitation unlike meniscectomy): Weight-bearing: WBAT (weight-bearing as tolerated) with crutches for comfort 1-2 weeks, progress to full weight-bearing without aids by 2 weeks. Some surgeons restrict to partial weight-bearing (50%) for 4 weeks but evidence does not support benefit (meniscal stress primarily from ROM not axial loading). ROM (Range of Motion) - CONTROVERSIAL: Traditional protocol: 0-90° flexion restriction for 4-6 weeks (especially large posterior horn tears) using hinged brace, rationale is biomechanical data showing meniscal stress increases >90° flexion. Modern protocol: Full ROM immediately allowed including flexion >120°, based on RCTs showing no difference in healing rates. My approach: INDIVIDUALIZED - Large posterior horn repair (>15mm, far posterior): 0-90° restriction with brace for 4-6 weeks, then gradual increase; Small/moderate body or anterior horn repair (<15mm): Full ROM from day 1 including >120° flexion. All patients regardless of protocol: Avoid deep flexion >120° and squatting/kneeling until 4-6 months (maximal meniscal hoop stress occurs at deep flexion and with rotation). Exercises week 0-2: Quadriceps sets (isometric) 10 reps every hour preventing atrophy, ankle pumps 20 reps every 2 hours preventing DVT, straight leg raises when quad control adequate (day 2-3), hamstring sets gentle isometric. Week 2-6: Stationary cycling (light resistance, seat high if ROM restricted), closed chain exercises (wall squats 0-60°, leg press 0-60°, step-ups low step), pool exercises. Week 6-12: Progress to full ROM unrestricted, deeper squats/lunges, single-leg exercises, proprioception training, sport-specific preparation. Month 3-4: Running program if criteria met. Month 4-6: Return to sport if healing confirmed and functional criteria met (strength >85%, hop testing >85%, no pain/swelling). Analgesia: Multimodal - paracetamol 1g QID regular, NSAIDs short-term 5-7 days (celecoxib 200mg BD or ibuprofen 400mg TDS), opioids PRN minimal (endone 5-10mg, avoid routine use, 3-5 days maximum). Ice therapy 20 minutes every 2-3 hours for 48-72 hours. VTE prophylaxis: Mechanical (TED stockings, intermittent pneumatic compression if available), early mobilization most important, pharmacological NOT routine for arthroscopy unless high-risk patient (previous VTE, obesity, cancer, prolonged immobility). Follow-up schedule: 2 weeks - wound check and suture removal, assess ROM/effusion/quad function; 6 weeks - clinical exam, assess ROM/strength, X-ray if concurrent ACL (tunnel position); 4-6 months - assess healing clinically, consider MRI if symptoms or borderline for sport clearance, functional testing for return to sport clearance. Return to sport: Minimum 4 months from surgery (prefer 6 months for competitive athletes), must meet objective criteria (full ROM, strength >85% contralateral, hop testing >85%, no pain/swelling, completed sport-specific training), gradual return over 2-4 weeks (non-contact → limited contact → full contact). Counseling: Emphasize that meniscal repair rehabilitation is MORE restrictive and LONGER (4-6 months) than meniscectomy (6-12 weeks) to protect repair during healing. Trade-off is meniscal preservation reducing long-term arthritis risk. Failure risk 10-20% may require later meniscectomy but attempting repair does not worsen outcomes. Compliance with restrictions critical for success - patients who return to sport early (<4 months) or deep squat early (<4-6 months) have higher failure rates.

Exam Pearl

Technical Tip: EXAM KEY - Post-operative rehabilitation for meniscal repair is MORE restrictive than meniscectomy and this must be clearly explained to patient pre-operatively. The extended rehab (4-6 months vs 6-12 weeks for meniscectomy) is trade-off for meniscal preservation and reduced long-term OA risk. ROM protocol is controversial: Traditional strict restriction (0-90° for 4-6 weeks) based on biomechanics vs modern unrestricted based on RCTs showing no difference. I individualize: Large posterior horn tears get restriction (these have highest stress in flexion), small tears get full ROM. All patients avoid deep flexion/squatting until 4-6 months regardless (maximal meniscal stress). Weight-bearing I allow WBAT immediately (evidence shows no benefit to restriction, meniscal stress primarily from ROM not loading). Return to sport minimum 4 months requires objective criteria (ROM, strength, hop testing, imaging if borderline) - early return (<4 months) increases failure risk. Patient compliance is critical - non-compliance with deep flexion restriction or early sport return common causes of failure.

Dangers at this step

Too aggressive rehabilitation - theoretical risk of repair failure especially for large posterior horn tears; deep flexion/squatting before 4-6 months creates maximal meniscal stress potentially disrupting repair
Too conservative rehabilitation unnecessarily - excessive ROM restriction (beyond 6 weeks) or prolonged weight-bearing restriction causes stiffness and weakness without proven benefit
Patient non-compliance with restrictions - very common problem; patients feel good at 6-8 weeks and resume activities too early; need extensive counseling about extended timeline and failure risk with early return
Early return to sport before 4 months - increases failure risk; need minimum healing time regardless of functional status; also need objective criteria (imaging if borderline)
Inadequate counseling about extended rehab - patients unprepared for 4-6 month timeline become frustrated; must explain trade-off (extended rehab vs meniscal preservation) pre-operatively

Complications - Recognition, Prevention, Management

Meniscal Repair Complications

Exam Viva Scenarios

Practice these scenarios to excel in your viva examination

VIVA SCENARIOStandard

EXAMINER

"A 28-year-old competitive footballer presents with 6-week history of medial knee pain and catching after twisting injury. MRI shows 18mm vertical longitudinal tear of medial meniscus posterior horn in red-white zone with concurrent ACL tear. How would you manage this? Discuss your surgical approach and technique."

EXCEPTIONAL ANSWER

This is an ideal candidate for meniscal repair with concurrent ACL reconstruction - young active patient, acute injury <12 weeks, suitable tear pattern (vertical longitudinal), appropriate tear length (18mm allows multiple fixation points), red-white zone location (vascular enough for healing especially with ACL), and concurrent ACL (dramatically improves meniscal healing from 60-70% to 80-90%). I would counsel about attempting repair rather than meniscectomy to preserve meniscal function and prevent long-term OA (meniscectomy increases OA risk 5-10x at 10-20 years). The trade-off is extended rehabilitation (4-6 months vs 6-12 weeks for meniscectomy) and 10-20% failure risk, but attempting repair does not worsen outcomes if it fails - can still do meniscectomy later with similar results to primary meniscectomy. Surgical technique: Arthroscopy via standard anterolateral viewing and anteromedial working portals. Systematic examination confirming MRI findings. I would assess meniscal tear repairability: zone (measure distance from periphery with probe - red-white zone at 3-5mm), pattern (vertical longitudinal is favorable), length (18mm suitable), stability (probe test for displacement), tissue quality (should be good in acute injury), reducibility. I would prepare tear by abrading edges with meniscal rasp creating bleeding surfaces and rasp peripheral capsule to enhance vascularity. For 18mm posterior horn tear, I have two technique options: All-inside (my preference for most tears) using specialized devices like Fast-Fix or FiberStitch, placing 4 devices at 4-5mm spacing along tear - advantages are no accessory incision, lower morbidity, equivalent healing rates (80-90% with ACL); or Inside-out if tear extends far posterior (>10mm from PCL) where all-inside access is difficult - requires 3-4cm posteromedial incision with retractor to protect saphenous nerve, pass cannulated needles from inside to outside with 2-0 non-absorbable sutures. For this 18mm posterior horn tear, if it's within 10mm of PCL I would use all-inside (faster, lower nerve risk); if extends far posterior I might use inside-out or hybrid approach for posterior aspect. I would verify repair meticulously from both portals ensuring: anchors deployed outside capsule (not intra-articular which causes chondral damage), tear edges well-approximated with <1mm gap, repair stable with probe testing, full ROM without impingement. Then proceed with ACL reconstruction (femoral/tibial tunnels, graft passage, fixation) - the drilling creates blood and growth factors enhancing meniscal healing. Post-operatively: For this posterior horn tear I would use 0-90° ROM restriction with brace for 4-6 weeks (high stress location), then gradual increase to full ROM. Weight-bearing as tolerated with crutches progressing to full by 2 weeks. Avoid deep flexion/squatting until 4-6 months. Return to sport minimum 4-6 months with objective criteria (ROM, strength >85%, hop testing >85%, no symptoms). Expected outcome: 80-90% healing rate with concurrent ACL, excellent long-term function if successful, preserves meniscus reducing arthritis risk. If fails (10-20% risk, usually within first year), can perform meniscectomy with similar outcomes to primary meniscectomy - therefore no harm in attempting repair.

VIVA SCENARIOStandard

EXAMINER

"Compare all-inside and inside-out meniscal repair techniques. What are the indications, advantages, disadvantages, and outcomes of each? Which do you prefer and why?"

EXCEPTIONAL ANSWER

All-inside and inside-out are the two main techniques for meniscal repair, with all-inside now most commonly used (70-80% of repairs) but inside-out still has specific indications. All-inside technique uses specialized devices (Fast-Fix, FiberStitch, Sequent, Omnispan, many others) that deploy anchors on both sides of the meniscal tear through arthroscopic portals only without accessory incision. Insert device through working portal, position across tear perpendicular to meniscus, deploy anchors on capsular and central sides of tear with tensioning system compressing tear, repeat for multiple devices along tear at 4-5mm spacing. Indications: Vertical longitudinal or bucket-handle tear in body or mid-posterior horn (within 5-10mm of PCL), red-red or red-white zone, young patient, good tissue quality. Suitable for most meniscal repairs. Not suitable for far posterior horn tears (>10mm posterior to PCL) where access is difficult. Advantages: (1) No accessory incision beyond portals - lower morbidity, less pain, faster recovery; (2) Lower neurovascular injury risk (<1% vs 1-5% for inside-out) - no nerve exposure; (3) Faster procedure (30-40 minutes vs 50-60 for inside-out); (4) Equivalent healing rates - 80-90% with ACL at 2-5 years; (5) Easier learning curve than inside-out. Disadvantages: (1) High implant cost - $500-800 per device, typically need 3-5 devices = $1500-4000 vs $50-100 for inside-out sutures; (2) Implant-related complications 2-5% - migration, prominence, intra-articular placement causing chondral damage, synovitis, device fracture; (3) Difficult access to far posterior horn - cannot reach tears >10mm posterior to PCL; (4) Shorter follow-up data - 2-5 years vs 5-15 years for inside-out. Inside-out technique uses cannulated needles passed from inside knee through meniscal tear and capsule to outside incision where sutures are tied. Requires 3-4cm posteromedial incision (for medial meniscus) or lateral incision (for lateral rarely done), blunt retractor protecting neurovascular structures, pass multiple 2-0 non-absorbable sutures at 4-5mm spacing, tie over capsule or tying posts. Indications: Far posterior horn tear (>10mm posterior to PCL) where all-inside cannot access, large complex tear requiring precise suture placement, revision repair (can remove old devices and place sutures precisely), cost-conscious setting (low implant cost). Advantages: (1) Excellent access to far posterior horn - can reach even most posterior tears; (2) Precise fixation - can place sutures exactly where needed; (3) Longest follow-up data - 5-15 years showing 85-90% healing with ACL; (4) Low implant cost - sutures and needles <$100 vs $1500-4000 for all-inside; (5) No implant complications - suture-only fixation; (6) Historical gold standard - benchmark for comparison. Disadvantages: (1) Neurovascular injury risk 1-5% - saphenous nerve injury despite retractor causing permanent medial leg numbness/dysesthesia; common peroneal nerve injury (<1%) for lateral repair; (2) Accessory incision morbidity - pain, hematoma, wound complications; (3) Slower procedure - 50-60 minutes vs 30-40 for all-inside due to incision, retractor, needle passage; (4) Steeper learning curve - requires mastery of incision placement, retractor use, needle passage. Outcomes comparison: Multiple RCTs and meta-analyses comparing all-inside vs inside-out show no significant difference in healing rates for suitable tear patterns (body and mid-posterior horn). Both achieve 80-90% healing with ACL reconstruction at available follow-up. All-inside has lower morbidity and complications (excluding implant issues), inside-out has longer durability data. My preference: I use all-inside for 70-80% of my meniscal repairs - specifically for vertical longitudinal and bucket-handle tears in body or mid-posterior horn (within 10mm of PCL). Advantages outweigh disadvantages for most tears: no incision, lower nerve risk, faster, equivalent healing. I accept implant cost and potential device complications because overall morbidity is lower. I use inside-out for 20-25% of repairs - specifically for far posterior horn tears (>10mm from PCL) where all-inside access is difficult, or revision repairs where I want precise suture placement. I rarely use inside-out for primary repairs unless truly cannot access with all-inside, because nerve injury risk (1-5% despite careful technique) and incision morbidity are significant.

VIVA SCENARIOStandard

EXAMINER

"What are the neurovascular dangers of meniscal repair and how do you protect against them? Describe the relevant anatomy, injury rates, recognition, and management of complications."

EXCEPTIONAL ANSWER

Meniscal repair has several important neurovascular structures at risk, with injury rates varying by technique and location. I'll discuss each danger structure systematically. Saphenous nerve is the most commonly injured structure at 1-5% for inside-out medial repairs despite retractor protection. Anatomy: Descends posteromedially with great saphenous vein, located 1-2cm posterior to MCL at joint line level, emerges between sartorius and gracilis tendons, courses superficial to deep fascia down medial leg to medial malleolus, purely sensory innervating medial leg and foot. At risk during: Inside-out medial meniscal repair when needles/sutures penetrate capsule without adequate protection, or if posteromedial incision placed >2cm posterior to MCL directly over nerve. Protection: (1) Posteromedial incision positioned exactly 1cm posterior to palpable MCL edge (mark before incision) - more posterior increases risk; (2) Careful dissection identifying nerve early; (3) Blunt retractor (curved Army-Navy or meniscal repair retractor) positioned between capsule and neurovascular structures during all needle passages; (4) Palpate retractor continuously ensuring protective position; (5) Pass needles close to capsule horizontally (not deep/posterior); (6) Check needle tips exit over retractor; (7) Alternative - use all-inside technique (nerve injury <0.5% due to no incision and limited penetration depth). Recognition: Immediate post-operative numbness/dysesthesia medial leg from knee to medial malleolus, burning pain, allodynia, hypersensitivity, positive Tinel's sign at incision or joint line. Management: Usually permanent - sensory nerves recover poorly. Symptomatic treatment with neuropathic pain medications (gabapentin 300-900mg TDS, pregabalin 75-150mg BD, amitriptyline 10-25mg nocte), desensitization therapy. Surgical exploration rarely helps. Counsel patient: likely permanent, no definitive treatment, may improve slightly over 6-12 months but unlikely to resolve completely. Devastating complication despite being 'minor' sensory nerve - patients have constant awareness of numbness, painful dysesthesia affecting quality of life. Popliteal artery and vein are at risk during posterior horn repairs, though injury is rare (<0.1%) but catastrophic. Anatomy: Vessels course through popliteal fossa approximately 1cm posterior to posterior capsule at level of PCL, artery more medial than vein, surrounded by adipose tissue. At risk during: Posterior horn meniscal repair if needles/devices directed >10mm posteriorly through capsule, especially if knee extended (posterior structures closer to capsule). Protection: (1) Maintain knee flexion 70-90° during posterior horn repair (relaxes posterior capsule, moves vessels posteriorly away from capsule); (2) Limit needle/device penetration depth to <10mm past capsule; (3) Direct needles/devices horizontally across meniscus (not posteriorly/deep); (4) Use blunt retractor for inside-out providing some posterior protection; (5) Consider all-inside for most repairs (less depth penetration risk than inside-out); (6) Know anatomy - vessels approximately 1cm posterior to capsule. Recognition: Intra-operative pulsatile bleeding, rapidly expanding hemarthrosis, loss of distal pulses (dorsalis pedis, posterior tibial), pale cool foot, expanding popliteal hematoma, post-operative compartment syndrome. Management: EMERGENCY - immediate vascular surgery consultation. If instrument impaling vessel, leave in place (do not remove). Prepare for open vascular repair. Convert to posteromedial or posterolateral approach depending on vessel location. Direct pressure for hemostasis. Vessel repair or bypass if transected. If recognized post-operatively: urgent vascular assessment (ABI, Doppler ultrasound, CT angiography), emergency repair if ischemia, fasciotomy if compartment syndrome. Prognosis depends on timing - delayed recognition leads to limb ischemia, compartment syndrome, possible amputation. Common peroneal nerve at risk during lateral meniscal repair, though lateral inside-out rarely performed for this reason. Anatomy: Wraps around fibular neck 2-3cm distal to joint line laterally, very superficial in subcutaneous tissue, divides into deep and superficial branches, supplies ankle dorsiflexion and toe extension (deep) and foot eversion and sensation dorsal foot (superficial). At risk during: Inside-out lateral meniscal repair if incision placed too distal or needles penetrate laterally; also from lateral portal placement if too inferior. Protection: (1) Inside-out lateral repair rarely performed - all-inside preferred; (2) If inside-out necessary, make incision at joint line level (not distal), use retractor, pass needles horizontally; (3) Lateral portals placed at joint line (not distal); (4) Know anatomy - nerve wraps around fibular neck 2-3cm distal to joint line. Recognition: Post-operative foot drop, inability to dorsiflex ankle/extend toes, weakness with eversion, sensory loss dorsal foot. Devastating motor injury. Management: If acute compression (hematoma), urgent decompression; otherwise observation, ankle-foot orthosis (AFO) for functional bracing, physiotherapy, possible tendon transfers if no recovery at 6-12 months. Recovery variable - complete transection unlikely to recover, neuropraxia may recover over 3-12 months. Great saphenous vein travels with saphenous nerve posteromedially. At risk during: Posteromedial incision for inside-out repair or needle penetration without retractor. Protection: Careful dissection during incision identifying vein early, protect with retractor during needle passage. Recognition: Bleeding from incision, post-operative hematoma, ecchymosis tracking down medial leg. Management: Usually conservative with compression, ice, elevation; may require hematoma evacuation if large or infected. Overall neurovascular injury prevention strategy: (1) Use all-inside technique for most repairs (nerve injury <0.5%, limited depth penetration reducing vessel risk); (2) If inside-out required, meticulous technique with proper incision placement, retractor use, needle direction; (3) Maintain appropriate knee flexion during posterior horn repair; (4) Know anatomy thoroughly; (5) Lower threshold for all-inside over inside-out to avoid nerve injury risk.