High Yield Overview

PARTIAL MENISCECTOMY

Standard anterolateral and anteromedial arthroscopic portals at joint line level lateral and medial to patellar tendon | intermediate

Critical Danger Structures

Danger Zone 1

Location: Saphenous nerve runs 2-3cm posterior to anteromedial portal, courses with great saphenous vein along medial calf

Protection: Keep anteromedial portal anterior at joint line, transilluminate skin before incision, use horizontal skin incision, avoid far medial portals; injury rate 0.5-2% causing medial leg numbness

Danger Zone 2

Location: Infrapatellar branch of saphenous nerve crosses anterior to anteromedial portal 1-2cm below joint line, running horizontally

Protection: Use horizontal (not vertical) skin incisions parallel to nerve, blunt dissection through subcutaneous tissues; injury common (up to 22%) causing numbness medial to tibial tubercle

Danger Zone 3

Location: Common peroneal nerve wraps around fibular neck 3-4cm below lateral joint line, superficial and vulnerable

Protection: Avoid far lateral portals beyond mid-patella, limit posterolateral procedures, maintain awareness during lateral compartment work; injury causes foot drop (0.1-0.3%)

Danger Zone 4

Location: Popliteal artery and vein lie 5-10mm posterior to posterior joint capsule at joint line level, closer in flexion

Protection: Use hand instruments (not motorized shaver) for posterior horn work, keep instruments anterior to capsule, avoid aggressive posterior dissection; catastrophic if injured

Danger Zone 5

Location: Articular cartilage of femoral condyles and tibial plateaus susceptible to iatrogenic damage during instrument manipulation

Protection: Maintain visualization at all times, gentle instrument handling, shaver away from cartilage surfaces, adequate joint distension, document pre-existing damage; iatrogenic chondral injury accelerates OA

Mnemonic

PRESERVEPRESERVE - Principles of Meniscectomy

Mnemonic

TEARSTEARS - Meniscal Tear Classification

Positioning and Preparation

Patient Position: Supine with leg in leg holder or hanging over table edge allowing knee flexion 0-90°, figure-of-four position for medial compartment access, tourniquet optional

Surgical Approach: Standard anterolateral and anteromedial arthroscopic portals at joint line level lateral and medial to patellar tendon

Incision: Two 5mm portal incisions: anterolateral portal 1cm lateral to patellar tendon at joint line, anteromedial portal 1cm medial to patellar tendon at joint line

Indications for Partial Meniscectomy

Primary Indications

TRUE Mechanical Symptoms (Post-FIDELITY Trial Evidence):

Definite locking with knee unable to fully extend
Catching sensation with reproducible mechanical block
Giving way episodes with meniscal instability
Failed conservative management (6-12 weeks minimum)
MRI confirmation of meniscal tear pattern

Tear Patterns Requiring Meniscectomy:

White-white zone tears (avascular, cannot heal)
Complex degenerative tears not amenable to repair
Horizontal cleavage tears with unstable inferior leaf
Radial tears extending into avascular zone
Failed meniscal repair with persistent symptoms

Age and Activity Considerations:

Young active patients: maximize preservation, consider repair
Middle-aged (40-60): balance symptoms vs OA risk
Elderly with degenerative tears: very selective, often non-operative
Athletes: return to sport goals vs long-term joint health

Contraindications

Absolute Contraindications:

Repairable tear in red-red or red-white vascular zone
Meniscal root tear (requires repair/reconstruction, not resection)
Active knee infection or septic arthritis
Degenerative tear with pain only (no mechanical symptoms)

Relative Contraindications:

Advanced osteoarthritis (grade 3-4) - consider TKA instead
Significant limb malalignment (address alignment first)
Unrealistic patient expectations
Previous extensive meniscectomy (consider MAT)
ACL deficiency without planned reconstruction
Poor patient compliance with rehabilitation

Evidence-Based Patient Selection

FIDELITY Trial Implications (Sihvonen et al. NEJM 2013):

No benefit over sham surgery for degenerative tears at 2 and 5 years
Reserve surgery for TRUE mechanical symptoms
Pain alone is NOT an indication
Conservative management first-line for degenerative tears

Predictors of Poor Outcome:

Degenerative tear pattern (vs traumatic)
Pre-existing chondral damage (grade 3-4)
>50% meniscal resection required
Lateral > medial meniscectomy
Concurrent ACL deficiency
Limb malalignment (varus/valgus)

Operative Technique

Step 1: Patient Positioning and Setup

Patient Positioning and Setup: Position patient supine with operative leg in leg holder or hanging over table edge, allowing full knee flexion and valgus/varus stress for compartment access. Apply tourniquet to proximal thigh (optional - usually not inflated for short procedures). Mark portals, bony landmarks, and joint line. Prepare and drape. Set up arthroscopy tower with pump pressure 40-60mmHg (higher if needed for haemostasis). Have shaver (4.5mm aggressive), basket forceps, arthroscopic probes, and biters readily available.

Exam Pearl

Technical Tip: EXAM KEY: 'I position the leg in a holder allowing FIGURE-OF-FOUR position for medial compartment access with valgus stress. I use PUMP PRESSURE 40-60mmHg to maintain visualisation. Tourniquet is OPTIONAL for meniscectomy - I often avoid it for short procedures to allow assessment of vascularity and reduce tourniquet-related complications.'

Dangers at this step

Inadequate positioning → poor compartment access, incomplete resection
Excessive pump pressure (>80mmHg) → fluid extravasation, compartment syndrome risk
Tourniquet time >90 mins → nerve palsy, muscle injury, increased VTE risk
Leg holder malposition → neurovascular compression, positioning injury

Step 2: Portal Establishment

Portal Establishment: Establish anterolateral portal first (viewing portal): 1cm lateral to patellar tendon, at joint line level, aim towards intercondylar notch. Make 5mm horizontal skin incision, use blunt dissection through subcutaneous tissue, confirm capsule penetration with "give". Insert scope with blunt obturator under pressure to enter joint. Establish anteromedial portal under direct visualisation: 1cm medial to patellar tendon, at joint line, using spinal needle to confirm trajectory before incision. Ensure horizontal skin incisions to minimize infrapatellar nerve injury. Avoid far medial or lateral portals that risk neurovascular structures.

Exam Pearl

Technical Tip: EXAM KEY: 'I establish the ANTEROLATERAL portal first as my viewing portal using a HORIZONTAL skin incision. I then create the ANTEROMEDIAL portal under DIRECT VISION using a SPINAL NEEDLE first to confirm correct trajectory. Horizontal incisions parallel to the infrapatellar nerve reduce injury risk from 22% to <5%. I transilluminate before medial portal to identify saphenous nerve course.'

Dangers at this step

Medial portal too posterior → saphenous nerve injury (2-3cm posterior to ideal location)
Vertical skin incisions → infrapatellar branch injury (up to 22% vs 5% with horizontal)
Instrument damage to articular cartilage during portal creation → iatrogenic chondral injury
Portal too proximal → suprapatellar pouch only, inadequate meniscal access
Portal too distal → fat pad interference, poor visualization

Step 3: Diagnostic Arthroscopy

Diagnostic Arthroscopy: Perform systematic diagnostic examination: Start in suprapatellar pouch (synovitis, loose bodies, plica), assess patellofemoral joint (tracking, chondral damage), examine medial compartment with valgus stress (meniscus, femoral condyle, tibial plateau), visualise intercondylar notch (ACL, PCL integrity), examine lateral compartment with varus stress (meniscus, condyles, plateau), assess posteriorly if needed. Document all pathology including ICRS chondral grading (0-4 scale). Probe menisci systematically to assess tear pattern, extent, stability, and critically determine reparability before considering resection.

Exam Pearl

Technical Tip: EXAM KEY: 'I perform a SYSTEMATIC diagnostic arthroscopy examining ALL compartments before treating the meniscus - this follows a consistent sequence: suprapatellar pouch, patellofemoral joint, medial compartment (with VALGUS stress), intercondylar notch (ACL/PCL), lateral compartment (with VARUS stress), posterior if needed. I use ICRS grading for chondral lesions (0=normal, 4=full thickness to bone). I PROBE the entire meniscus circumferentially to assess tear pattern, stability, and REPAIR POTENTIAL before proceeding with meniscectomy - repair always preferred if feasible.'

Dangers at this step

Missing associated ACL injury → accelerated OA post-meniscectomy without reconstruction
Incomplete chondral assessment → untreated pathology, persistent symptoms
Proceeding with meniscectomy when repair possible → suboptimal outcome
Missing loose bodies in gutters/posterior → persistent mechanical symptoms
Inadequate tear assessment → incomplete resection or excessive removal

Step 4: Tear Classification and Assessment

Tear Classification and Assessment: Classify tear by: LOCATION - peripheral (red-red, vascular), middle (red-white), central (white-white, avascular); PATTERN - vertical longitudinal (best for repair), radial (extends into avascular zone, disrupts hoop stress), horizontal cleavage (degenerative, resect inferior leaf), complex/degenerative (usually meniscectomy), bucket-handle (reduced longitudinal, may be repairable), root tear (NEVER resect - repair/reconstruct); STABILITY - probe to assess if fragment mobile and unstable (>3mm displacement abnormal). Document meniscus remaining thickness and tissue quality (degenerative vs traumatic). Critically assess if tear is REPAIRABLE: vertical longitudinal tears in red-red or red-white zones with stable peripheral rim and good tissue quality are best candidates. If repairable, proceed with repair rather than resection to preserve meniscal function and reduce OA risk.

Exam Pearl

Technical Tip: EXAM KEY: 'I classify tears using the TEARS mnemonic: Traumatic vs Degenerative, Extent (red-red/red-white/white-white zones), Anatomy of tear pattern, Root integrity, and Stability assessment. The RED-RED zone (peripheral 3mm, 10-25% of width) has best healing potential. VERTICAL LONGITUDINAL tears in vascular zone are most amenable to repair. HORIZONTAL CLEAVAGE tears are typically degenerative - I resect the inferior unstable leaf and preserve superior articular surface. RADIAL tears disrupt circumferential collagen fibres causing loss of hoop stress - very poor prognosis regardless of treatment. ROOT TEARS must be REPAIRED/RECONSTRUCTED, never resected, as root failure creates functional total meniscectomy. I always consider REPAIR before resection following the PRESERVE principle.'

Dangers at this step

Resecting repairable vertical longitudinal tear in red zone → suboptimal outcome, accelerated OA
Missing meniscal root tear → different management required (repair/reconstruction)
Underestimating tear extent → residual unstable fragments, persistent symptoms
Misclassifying degenerative vs traumatic → inappropriate patient selection
Inadequate stability assessment → incomplete resection or excessive removal

Step 5: Working Portal Selection

Working Portal Selection: Select optimal working portal based on tear location: for medial meniscus, work through anteromedial portal with scope in anterolateral, apply valgus stress and external rotation (figure-of-four position) to open medial compartment; for lateral meniscus, swap (scope in anteromedial, work through anterolateral), apply varus stress and internal rotation to open lateral compartment. For difficult posterior horn tears, consider accessory posteromedial or posterolateral portals if standard portals provide inadequate access. Use a probe in one portal to retract and manipulate tissue while resecting with instruments through the working portal. Optimize visualization with appropriate pump pressure, clear any bleeding with shaver or RF device.

Exam Pearl

Technical Tip: EXAM KEY: 'For MEDIAL MENISCUS posterior horn, I use the anteromedial portal as working portal with scope laterally, apply VALGUS STRESS and EXTERNAL ROTATION (figure-of-four) to open the medial compartment - this is critical for access. For LATERAL MENISCUS, I work through anterolateral portal with scope medially, use VARUS and INTERNAL ROTATION. I avoid excessive force which can cause MCL/LCL injury. A probe through the opposite portal helps retract and assess fragment stability. For very posterior horn tears, I may use an accessory POSTEROMEDIAL portal created under direct vision 1cm above joint line, 1cm posterior to femoral condyle, being aware of saphenous nerve posteriorly.'

Dangers at this step

Excessive valgus stress → MCL injury, particularly if repeated or prolonged
Excessive varus stress → LCL injury, peroneal nerve traction
Inadequate visualization → incomplete resection or iatrogenic chondral damage
Posterior portal placement without anatomic knowledge → neurovascular injury (saphenous nerve, popliteal vessels)
Instrument collision between portals → articular cartilage damage

Step 6: Meniscal Resection - Unstable Tissue Removal

Meniscal Resection - Unstable Tissue Removal: Begin resection by clearly identifying the tear margin and unstable tissue fragment. Use basket forceps or biters to remove unstable, torn meniscal fragments piece by piece in a controlled manner. For HORIZONTAL CLEAVAGE tears: resect the inferior unstable leaf completely while preserving the superior articular surface which maintains load distribution. For RADIAL tears: resect back to stable rim, contour edges smoothly, accept that circumferential fibre disruption causes poor biomechanical outcome. For DEGENERATIVE tears: remove all loose, fibrillated, unstable tissue that could cause mechanical symptoms. For BUCKET-HANDLE tears: reduce fragment and assess if repairable, if not reducible or in white zone, resect displaced fragment. Fundamental principle: PRESERVE MAXIMUM STABLE MENISCUS while removing all unstable tissue - avoid excessive resection which accelerates OA. Use hand instruments for controlled resection before using motorized shaver for contouring.

Exam Pearl

Technical Tip: EXAM KEY: 'The fundamental principle is PRESERVE MAXIMUM STABLE MENISCUS while removing all unstable tissue that could cause mechanical symptoms. I use HAND INSTRUMENTS (biters, basket forceps) first for controlled resection before the motorized shaver - this prevents inadvertent excessive tissue removal. For HORIZONTAL CLEAVAGE tears, I resect the INFERIOR LEAF completely and preserve the SUPERIOR ARTICULAR SURFACE which maintains contact area and load distribution. I resect back to stable tissue in ALL directions, checking stability with probe. Outcomes worsen significantly with >50% meniscal width resection - each 10% increase in resection increases contact stress proportionally. I document percentage of meniscus preserved for prognostication and medicolegal purposes.'

Dangers at this step

Excessive resection (>50% width) → accelerated osteoarthritis, poor functional outcome
Residual unstable fragment → persistent mechanical symptoms, reoperation
Instrument trauma to articular cartilage → iatrogenic chondral injury
Aggressive use of motorized shaver → uncontrolled tissue removal
Inadvertent root resection → functional total meniscectomy

Step 7: Contouring and Rim Stabilisation

Contouring and Rim Stabilisation: After removing unstable tissue with hand instruments, use motorized shaver (4.5mm aggressive blade) to contour the remaining meniscal rim to a smooth, stable edge without any loose or frayed tissue. The goal is a smooth transition zone with no unstable flaps that could cause mechanical symptoms or progressive tearing. Use gentle touch with shaver - hold away from remaining meniscus until blade engaging tissue, avoid pressing shaver directly into meniscal rim or articular cartilage. Create a gradual taper at resection edge rather than sharp step-off. Probe the remaining rim to confirm stability - should not displace >3mm with probing. Ensure no loose fragments remain in joint (check all gutters and recesses). CRITICAL: Preserve meniscal root attachments - do not resect into anterior or posterior root insertions as this eliminates hoop stress function and creates functional total meniscectomy.

Exam Pearl

Technical Tip: EXAM KEY: 'I contour to a SMOOTH, STABLE rim without frayed edges using the motorized shaver CAREFULLY - I hold the shaver away from tissue until blade is positioned, then engage gently, and immediately withdraw to avoid excessive contact. I create a GRADUAL TAPER rather than sharp step-off which could propagate tearing. The remaining meniscus should be STABLE with <3MM displacement on probing. I NEVER resect into MENISCAL ROOTS (anterior and posterior horn insertions) as this eliminates hoop stress function - root integrity is essential for meniscal biomechanics even if meniscal body is partially resected. I check stability of entire remaining rim circumferentially, document % preserved, and photograph final result.'

Dangers at this step

Aggressive shaving → excessive tissue loss beyond unstable zone
Articular cartilage damage with shaver → iatrogenic chondral injury, OA acceleration
Root injury during contouring → functional meniscectomy, rapid OA progression
Sharp step-off at resection edge → stress riser, propagation of tear
Residual frayed edges → persistent symptoms, re-tear

Step 8: Assessment of Remaining Meniscus

Assessment of Remaining Meniscus: Systematically assess the remaining meniscal rim: document percentage of meniscus remaining in anterior-to-posterior length and radial width (aim to preserve >50% width if possible for better outcomes), probe entire circumference for stability (no segment should displace >3mm), ensure no further unstable fragments that could cause ongoing symptoms. Check that resection extends to truly stable tissue in all directions - any questionable areas should be tested with probe and revised if unstable. Visualise articular surfaces thoroughly for any iatrogenic damage from instruments. Document findings comprehensively including: location and pattern of original tear, amount resected (% of meniscus), tissue quality (degenerative vs traumatic appearance), final meniscal rim stability, any associated pathology. Ensure no loose bodies remain in medial/lateral gutters, suprapatellar pouch, or posterior compartments by systematic examination and irrigation.

Exam Pearl

Technical Tip: EXAM KEY: 'I document the PERCENTAGE of meniscus remaining in both length and width - outcomes worsen significantly with <50% width preservation, each 10% increase in resection increases contact stress and OA risk. I probe the entire rim circumferentially confirming STABILITY (<3mm displacement). I systematically check for LOOSE BODIES in all gutters (medial, lateral), suprapatellar pouch, and posteriorly - these can cause persistent mechanical symptoms if missed. I assess tissue quality: DEGENERATIVE tissue (yellow, friable, horizontal cleavage pattern) suggests poorer prognosis vs TRAUMATIC tears (white, firm tissue, vertical pattern). I photograph the final meniscal rim from multiple angles for documentation and discuss prognosis with patient post-operatively including OA risk.'

Dangers at this step

Residual instability not detected → persistent mechanical symptoms, reoperation (5-10%)
Missed loose bodies → mechanical locking, repeat arthroscopy
Unrecognised root pathology → rapid OA progression
Inadequate documentation → medicolegal vulnerability
Overly optimistic prognosis communication → patient dissatisfaction

Step 9: Assessment of Associated Pathology

Assessment of Associated Pathology: Systematically assess and address associated pathology identified during diagnostic arthroscopy: CHONDRAL LESIONS - document with ICRS grading (grade 0=normal, 1=softening, 2=partial thickness <50%, 3=partial thickness >50%, 4=full thickness to bone), consider microfracture for focal full-thickness lesions <2cm² in appropriate patients; ACL DEFICIENCY - if present, counsel patient that meniscectomy without ACL reconstruction significantly accelerates OA and has worse outcomes, discuss staged reconstruction; PLICA - resect if thickened and symptomatic (popping, snapping); SYNOVITIS - consider partial synovectomy if significant, may indicate inflammatory pathology. LOOSE BODIES - remove any osteochondral fragments. If meniscal loss is substantial (>50%) and patient is young (<40 years), discuss future meniscal allograft transplantation as salvage option to delay OA. Photograph all key findings for comprehensive documentation and medicolegal protection.

Exam Pearl

Technical Tip: EXAM KEY: 'I assess for ASSOCIATED PATHOLOGY which significantly impacts prognosis: ACL deficiency with meniscectomy has WORSE OUTCOMES and accelerated OA - I discuss ACL reconstruction either concurrent or staged. For CHONDRAL LESIONS, I use ICRS grading systematically: Grade 1=softening, Grade 2=partial <50% depth, Grade 3=partial >50%, Grade 4=full thickness to bone. Focal grade 4 lesions <2cm² may benefit from MICROFRACTURE. In young patients (<40 years) with substantial meniscal loss (>50%), I discuss future MENISCAL ALLOGRAFT TRANSPLANT as salvage option to delay arthroplasty. I photograph all key findings from multiple angles including: original tear, final meniscal rim, any chondral damage (pre-existing and iatrogenic), ACL status - comprehensive documentation protects against medicolegal issues.'

Dangers at this step

Missing ACL injury → accelerated OA, patient dissatisfaction, potential litigation
Untreated chondral pathology → persistent pain despite meniscal treatment
Poor documentation of pre-existing vs iatrogenic damage → medicolegal vulnerability
Not discussing MAT option in young patients → missed opportunity for joint preservation
Overlooking inflammatory arthropathy (RA, gout) → systemic disease progression

Step 10: Haemostasis and Washout

Haemostasis and Washout: Perform thorough joint washout with minimum 2-3 litres of normal saline to remove all debris, blood clots, meniscal fragments, and loose particles. Systematically irrigate all compartments: suprapatellar pouch, medial gutter, lateral gutter, posterior recesses. Use combination of pump flow and manual syringe flushing for thorough clearance. Reduce pump pressure to 20-30mmHg and assess for bleeding points - small oozing usually settles with joint compression post-operatively. Persistent arterial bleeding should be addressed with radiofrequency cautery device on low setting (avoid excessive thermal damage). Ensure absolutely no residual loose bodies or meniscal fragments which could cause mechanical symptoms. Take final arthroscopic photographs/video clips documenting: complete removal of unstable tissue, smooth stable meniscal rim, no loose bodies, final appearance of all compartments. This documentation is essential for medicolegal purposes and quality assurance.

Exam Pearl

Technical Tip: EXAM KEY: 'I perform THOROUGH WASHOUT with minimum 2-3 litres checking ALL compartments systematically for debris and loose bodies - even small fragments can cause persistent mechanical symptoms. I reduce pump pressure to 20-30mmHg to assess for bleeding - most oozing settles with post-operative compression. Persistent bleeding is addressed with RADIOFREQUENCY cautery on LOW setting (avoid high settings which cause thermal necrosis and chondral damage). I take FINAL PHOTOGRAPHS documenting: the completed meniscal rim appearance from multiple angles, absence of loose bodies, all compartments clear of debris, any associated findings. This comprehensive photographic documentation protects against medicolegal claims and provides quality assurance record. Clear fluid outflow at end confirms adequate washout.'

Dangers at this step

Retained loose bodies → persistent mechanical symptoms, repeat arthroscopy
Haemarthrosis from inadequate haemostasis → pain, stiffness, prolonged recovery
Excessive RF thermal energy → chondral necrosis, synovial damage
Inadequate documentation → medicolegal vulnerability
Incomplete washout → debris, inflammatory reaction

Step 11: Portal Closure and Dressing

Portal Closure and Dressing: Remove instruments under direct vision to ensure no meniscal fragments are extracted inadvertently and no tissue trapped in portals. Evacuate fluid from joint by manual compression with knee in extension. Close portal incisions: 5mm portals typically heal well with adhesive strips (Steri-Strips) alone - formal sutures optional but can use single interrupted 4-0 nylon if preferred. Apply sterile island dressings over portals. Apply compression bandage from toes to mid-thigh (crepe or elasticated) to reduce post-operative swelling and haemarthrosis. No drain required for isolated meniscectomy. If tourniquet used (uncommon for meniscectomy), release before closure, achieve haemostasis, and document tourniquet time. Apply ice pack or cryotherapy device over knee (reduces pain and swelling first 48-72 hours). Elevate leg post-operatively.

Exam Pearl

Technical Tip: EXAM KEY: 'I remove instruments under DIRECT VISION to ensure no fragments extracted and no tissue trapped in portals. Portal incisions can be closed with STERI-STRIPS alone - arthroscopy portals heal very well without formal sutures. I evacuate joint fluid by MANUAL COMPRESSION with knee extended before closure. I apply a COMPRESSION BANDAGE from toes to thigh to reduce swelling - this significantly improves patient comfort. ICE/CRYOTHERAPY for first 48-72 hours helps minimize effusion and pain. I provide verbal and written post-operative instructions including: immediate weight-bearing allowed, ROM exercises from day 1, elevation for 48 hours, ice application, simple analgesia, red flags to watch for (increasing pain, fever, calf swelling suggesting DVT/compartment syndrome).'

Dangers at this step

Retained instrument fragment in joint (rare but serious) → foreign body reaction
Wound complications if excessive soft tissue handling or tension on closure
Swelling from inadequate compression → haemarthrosis, prolonged recovery
Inadequate post-op instructions → complications missed (DVT, infection, compartment syndrome)
Portal site infection if non-sterile technique (0.1-0.5% risk)

Step 12: Post-operative Instructions and Rehabilitation

Post-operative Instructions and Rehabilitation: Immediate post-op (day 0-1): Weight-bearing as tolerated from day 1 (no restrictions for isolated meniscectomy), crutches for comfort only (wean rapidly over 2-3 days), compression bandage maintained 48 hours, ice application 20 minutes every 2-3 hours for 48-72 hours, leg elevation above heart level when resting. Early rehabilitation (days 1-14): Begin ROM exercises immediately - ankle pumps, heel slides, passive knee extension (no flexion contracture), quadriceps sets, straight leg raises. Gentle progressive flexion to 90° by week 1, full ROM by week 2. Simple analgesia (paracetamol 1g QDS, ibuprofen 400mg TDS if no contraindications). Wound review 7-10 days, remove dressings day 3-5 when portal sites dry. Progressive strengthening (weeks 2-6): Physiotherapy referral for structured quadriceps strengthening program, stationary bike when comfortable (usually week 2), closed chain exercises (mini squats, step-ups), progress resistance. Return to desk work 3-5 days, manual labour 2-4 weeks depending on demands. Return to sport (weeks 6-12): Sport-specific training when full ROM achieved, no effusion, 90% quadriceps strength vs contralateral, functional testing passed. Return to full sport typically 4-8 weeks for isolated meniscectomy. Critical counselling: Inform patient about LONG-TERM OA RISK (15-40% at 15-20 years), risk proportional to amount resected, worse with lateral meniscectomy, concurrent ACL deficiency, limb malalignment. Document this counselling as part of informed consent process. Discuss activity modification, weight management, monitoring for progressive symptoms.

Exam Pearl

Technical Tip: EXAM KEY: 'Rehabilitation is RAPID after isolated meniscectomy - WEIGHT-BEARING AS TOLERATED from day 1, full ROM by 1-2 weeks, return to sport 4-8 weeks. This contrasts with meniscal REPAIR which requires 6 weeks non-weight-bearing and 4-6 months return to sport. Immediate ROM exercises are critical - I emphasize NO FLEXION CONTRACTURE as this causes long-term functional impairment. I counsel ALL patients about INCREASED OA RISK long-term (15-40% at 15-20 years) - this must be documented pre-operatively as part of informed consent. The FIDELITY trial showed meniscectomy for degenerative tears was NO BETTER than sham surgery at 2 and 5 years, reinforcing that surgery should be reserved for TRUE mechanical symptoms only. I recommend activity modification, weight management (BMI <30), and monitoring for progressive symptoms that might indicate developing OA. Young patients (<40) with substantial resection (>50%) may be candidates for future meniscal allograft transplant as salvage.'

Dangers at this step

Premature return to sport → re-injury, new meniscal tear (5-10% risk)
Flexion contracture from inadequate extension exercises → functional impairment
Patient not counselled about OA risk → dissatisfaction when OA develops, litigation risk
Inadequate rehabilitation → quadriceps weakness, instability, poorer functional outcome
Missed DVT (rare but serious) → PE, mortality; watch for calf swelling, pain

Exam Viva Scenarios

Practice these scenarios to excel in your viva examination

VIVA SCENARIOStandard

EXAMINER

"A 35-year-old recreational footballer presents with 3 months of medial knee pain and intermittent locking. MRI shows a posterior horn medial meniscus tear. How would you manage this patient?"

EXCEPTIONAL ANSWER

This is a young active patient with MECHANICAL SYMPTOMS (locking) and MRI-confirmed meniscal pathology - this is a potential surgical candidate post-FIDELITY trial as he has true mechanical symptoms, not just pain. My management would be: HISTORY: Duration, mechanism (acute vs insidious suggesting degenerative), true locking (unable to fully extend) vs pseudo-locking (pain limiting extension), catching, giving way, previous trauma, ACL injury history, conservative treatment tried. EXAMINATION: Effusion, joint line tenderness, McMurray's test (clicking with valgus/external rotation), Thessaly test, Apley's grind test, check ACL (Lachman, anterior drawer), assess alignment. INVESTIGATIONS: Weight-bearing AP, lateral, skyline XR (assess for OA, alignment), MRI review (tear pattern, location, red-red/red-white/white-white zones, ACL status, chondral damage, root tears). CONSERVATIVE TRIAL: If not already tried, 6-12 weeks physiotherapy (quadriceps strengthening), activity modification, NSAIDs. SURGICAL DECISION: If true mechanical locking persists despite conservative treatment, offer arthroscopy. At arthroscopy: SYSTEMATIC examination, classify tear by location (red-red/red-white/white-white) and pattern (vertical/horizontal/radial/complex). REPAIR vs RESECTION: If tear in red-red or red-white zone with vertical longitudinal pattern and good tissue quality, REPAIR is preferred. If in white-white avascular zone, complex/degenerative pattern, proceed with meniscectomy. TECHNIQUE: Preserve maximum stable meniscus (<50% resection target), remove unstable tissue only, smooth stable rim, assess for root tears (must repair, never resect). COUNSEL about OA risk long-term (15-40% at 15-20 years, worse with extensive resection). POST-OP: Weight-bearing day 1, ROM immediately, return to sport 6-8 weeks for meniscectomy (4-6 months if repair). If significant ACL laxity present, discuss reconstruction to prevent accelerated OA post-meniscectomy.

VIVA SCENARIOStandard

EXAMINER

"Tell me about the FIDELITY trial and how it has changed practice for meniscal surgery."

EXCEPTIONAL ANSWER

The FIDELITY trial (Sihvonen et al. NEJM 2013) was a landmark RANDOMISED CONTROLLED TRIAL comparing arthroscopic partial meniscectomy to SHAM SURGERY for degenerative meniscal tears. METHODS: 146 patients aged 35-65 with degenerative medial meniscus tear, no OA, randomized to partial meniscectomy vs sham surgery (skin incisions only, no arthroscopy). Both groups received identical post-op care. Primary outcome was Lysholm and WOMET scores at 12 months. RESULTS: At 12 months, there was NO SIGNIFICANT DIFFERENCE in outcomes between groups - both improved equally (likely placebo effect and natural history). This was maintained at 2-year and 5-year follow-up. Subsequent meta-analyses confirmed no benefit of meniscectomy over conservative treatment or sham for degenerative tears. PRACTICE CHANGE: This has fundamentally changed patient selection for meniscal surgery. We now reserve meniscectomy for patients with TRUE MECHANICAL SYMPTOMS (definite locking where knee cannot fully extend, catching with reproducible mechanical block, giving way) rather than pain alone. Patients with degenerative meniscal tears and primarily PAIN without mechanical symptoms should be managed conservatively (physiotherapy, activity modification, NSAIDs) - surgery offers no benefit and exposes to surgical risks plus long-term OA acceleration. CURRENT INDICATIONS: (1) True mechanical locking/catching/giving way, (2) Failed conservative management 6-12 weeks minimum, (3) MRI-confirmed tear in white-white avascular zone (if repairable tear in red zone, repair preferred), (4) No advanced OA (consider arthroplasty instead), (5) Realistic patient expectations. COUNSELLING: All patients must be counselled about long-term OA risk (15-40% at 15-20 years) - this should be documented as part of informed consent. The trial reinforces that meniscectomy is NOT a benign procedure and should be performed selectively for appropriate indications only.

VIVA SCENARIOStandard

EXAMINER

"What are the risk factors for accelerated osteoarthritis after meniscectomy and how would you minimize this risk?"

EXCEPTIONAL ANSWER

Post-meniscectomy osteoarthritis is the most significant LONG-TERM COMPLICATION occurring in 15-40% of patients at 15-20 years. BIOMECHANICAL BASIS: Normal meniscus transmits 50-70% of joint load and increases contact area by 50%, reducing peak cartilage stress. Each 10% meniscal resection increases contact stress proportionally. Total meniscectomy causes 235% increase in peak contact stress leading to cartilage degeneration. RISK FACTORS: SURGICAL factors - AMOUNT RESECTED (most important - outcomes worsen with >50% width resection), LATERAL > MEDIAL meniscectomy (lateral bears more load - 70% vs 60% plateau coverage), TOTAL > PARTIAL meniscectomy, ROOT INJURY (causes functional total meniscectomy). PATIENT factors - YOUNG AGE at time of meniscectomy (longer exposure to altered biomechanics), CONCURRENT ACL DEFICIENCY (biomechanical instability accelerates degeneration), PRE-EXISTING CHONDRAL DAMAGE (grade 3-4 on ICRS grading), LIMB MALALIGNMENT (varus increases medial compartment load, valgus increases lateral), OBESITY (BMI >30 increases joint load), HIGH ACTIVITY LEVEL (athletes with high-impact sports). TEAR factors - DEGENERATIVE > TRAUMATIC tears (underlying degeneration progresses), COMPLEX tear patterns (more tissue resection required). MINIMIZING OA RISK: PRE-OPERATIVE - (1) Appropriate patient selection using FIDELITY trial criteria (mechanical symptoms only), (2) Conservative trial first (6-12 weeks), (3) Consider REPAIR vs resection (repair preserves function), (4) Address ACL deficiency (concurrent or staged reconstruction), (5) Counsel about OA risk (informed consent). INTRA-OPERATIVE - (1) PRESERVE MAXIMUM MENISCUS (most critical - aim <50% resection), (2) Remove unstable tissue only, (3) NEVER resect roots (causes functional total meniscectomy), (4) Gentle technique (avoid chondral damage), (5) Assess and treat associated pathology (chondral lesions, plica). POST-OPERATIVE - (1) Activity modification (avoid high-impact repetitive loading), (2) Weight management (BMI <30 target), (3) Quadriceps strengthening (offloads joint), (4) Monitor for progressive symptoms, (5) Consider future MAT if substantial loss in young patient. SALVAGE OPTIONS if OA develops: Meniscal allograft transplant (MAT) in young patients <50 before advanced OA, realignment osteotomy if malalignment, unicompartmental or total knee arthroplasty for end-stage disease.