High Yield Overview

ARTHROSCOPIC SUBACROMIAL DECOMPRESSION (ACROMIOPLASTY) FOR IMPINGEMENT SYNDROME

Arthroscopic via standard portals: posterior viewing portal, lateral working portal, anterior portal as needed. Focus on subacromial space for decompression. | intermediate

Critical Danger Structures

Axillary Nerve

Location: Courses 5-7cm distal to lateral acromion edge, wrapping posteriorly to anteriorly around surgical neck of humerus through quadrangular space

Protection: Position lateral portal 2-3cm (not >5cm) below lateral acromion edge, use outside-in technique with spinal needle localization, avoid excessive distal instrumentation

Deltoid Origin (Anterior Acromion)

Location: Originates from anterior border and superior surface of acromion extending 2-3cm posteriorly, provides primary shoulder abduction power

Protection: During acromioplasty, remain on inferior (undersurface) bone only, limit anterior resection to 5-7mm, burr should never extend beyond anterior acromion edge, preserve superior periosteum

Suprascapular Nerve

Location: Passes through suprascapular notch beneath superior transverse scapular ligament, innervates supraspinatus (50%) then curves around spinoglenoid notch to infraspinatus (50%)

Protection: Avoid excessive medial dissection beyond scapular base, limit burr use near scapular spine medially, maintain visualization during medial acromioplasty

Rotator Cuff (Supraspinatus/Infraspinatus)

Location: Supraspinatus lies directly beneath subacromial space inserting on superior facet greater tuberosity, infraspinatus posteriorly on middle facet, critical interval between them posteriorly

Protection: During bursectomy use shaver with suction on oscillating mode (not aggressive), burr for acromioplasty should face superiorly (toward acromion) never inferiorly, probe cuff before and after to detect iatrogenic injury

Musculocutaneous Nerve

Location: Pierces coracobrachialis 5-8cm distal to coracoid tip (average 6cm), anterior portal placement risk if excessively medial or distal

Protection: Anterior portal if needed should be lateral to coracoid tip, stay above subscapularis upper border, use outside-in with spinal needle localization, avoid blind trocar insertion

Mnemonic

B.U.R.S.A.BURSA Principles

Mnemonic

P.O.R.T.A.L.S.PORTALS for Shoulder Arthroscopy

Bigliani Acromion Morphology Classification

Critical for surgical decision-making in subacromial impingement:

Type I - Flat (10%)

Smooth flat undersurface
Minimal impingement risk
Often does NOT require acromioplasty
Consider other causes if symptomatic (internal impingement, cervical referred pain)

Type II - Curved (40%)

Gentle curved undersurface
Moderate impingement risk
May benefit from conservative anteroinferior decompression
Assess for associated spur formation

Type III - Hooked (50%)

Prominent anteroinferior hook
HIGHEST impingement risk
Clear mechanical block requiring acromioplasty
Primary indication for surgical decompression
Strong correlation with rotator cuff tears

Neer Impingement Staging System

Guides treatment selection and prognostication:

Stage I - Edema and Hemorrhage

Age typically <25 years
Acute inflammation of bursa and cuff
Reversible pathology
Treatment: conservative (rest, NSAIDs, PT)
Surgery rarely indicated
Prognosis excellent with non-operative management

Stage II - Fibrosis and Tendinitis

Age typically 25-40 years
Chronic bursal thickening
Rotator cuff fibrosis
Partial-thickness cuff tears may develop
Treatment: initial conservative 3-6 months, then consider surgery
PRIMARY surgical candidates for isolated SAD
Good surgical outcomes if mechanical impingement confirmed

Stage III - Bone Spurs and Tendon Rupture

Age typically >40 years
Irreversible changes
Anteroinferior acromial osteophytes
Full-thickness rotator cuff tears common
AC joint arthritis often present
Treatment: surgery usually required (SAD + cuff repair + DCE)
Outcomes dependent on cuff tear size/reparability
Higher complexity procedures

Coracoacromial Ligament Management Strategies

Traditional Approach - Complete Release

Historical teaching: release CA ligament improves decompression
Technique: electrocautery detachment from anteroinferior acromion
Advantage: maximal subacromial space volume
Concern: loss of superior humeral restraint

Modern Approach - Preservation

Current evidence-based trend: preserve CA ligament
Rationale: superior restraint especially with cuff deficiency
Technique: debride only thickened/calcified portions
Advantage: maintains superior stabilizer preventing escape
Critical with massive irreparable cuff tears

Middle Ground - Selective Debridement

Remove only mechanically impinging portions
Preserve lateral CA ligament fibers
Balance decompression with stability
Individualize based on cuff status

Exam Pearl

Classification Impact on Management: Bigliani Type I acromion with impingement symptoms should prompt search for alternative diagnoses (internal impingement, SLAP lesions, cervical pathology). Type III hooked acromion with positive impingement signs represents clear mechanical pathology amenable to surgical decompression. Recent evidence questions SAD benefit without structural acromion abnormality.

Positioning and Preparation

Patient Position: Beach chair position at 60-70° upright OR lateral decubitus with arm traction (10-12lbs). Beach chair preferred for conversion to open if needed, easier anatomic orientation. Arm in pneumatic holder allowing free movement.

Surgical Approach: Arthroscopic via standard portals: posterior viewing portal, lateral working portal, anterior portal as needed. Focus on subacromial space for decompression.

Incision: Multiple small arthroscopic portals (5-8mm): posterior viewing portal (soft spot), lateral working portal (2-3cm below lateral acromion), +/- anterior portal if needed for visualization or instrumentation.

Operative Technique

Step 1: Patient Positioning and Surface Marking

Patient Positioning and Surface Marking: Position in beach chair at 60-70° upright (preferred) or lateral decubitus with arm traction. Beach chair: head in gel donut/holder, arm in pneumatic arm holder allowing abduction/rotation. Mark ALL bony landmarks: anterior acromion edge, lateral acromion edge, posterior acromion edge, clavicle, AC joint, coracoid process, scapular spine. Mark planned portals: posterior (soft spot), lateral, anterior if needed.

Exam Pearl

Technical Tip: EXAM KEY: 'I use beach chair positioning which allows easy conversion to open if needed and provides anatomic orientation. I mark the acromion extensively - ANTERIOR edge (deltoid origin at risk), LATERAL edge (portal reference), POSTERIOR edge (portal site), and AC joint (medial limit). The soft spot is 2cm inferior and 1cm medial to posterolateral acromion corner for posterior portal.'

Dangers at this step

Hypotensive event with beach chair positioning (cerebral hypoperfusion) - ensure adequate blood pressure monitoring, consider vasopressors
Inadequate landmark identification leading to malpositioned portals and neurovascular injury
Patient positioning instability during procedure causing movement and visualization difficulty

Step 2: Establish Posterior Portal and Diagnostic Glenohumeral Arthroscopy

Establish Posterior Portal and Diagnostic Glenohumeral Arthroscopy: Create posterior portal at soft spot (2cm inferior, 1cm medial to posterolateral acromion corner). Enter glenohumeral joint directed toward coracoid. Perform systematic glenohumeral examination: biceps tendon, superior labrum, anterior labrum/capsule, subscapularis (look for partial tears), inferior pouch, posterior structures, rotator cuff articular surface (assess for partial-thickness tears >50% = repair), humeral head and glenoid cartilage.

Exam Pearl

Technical Tip: EXAM KEY: 'I start with diagnostic glenohumeral arthroscopy even though this is primarily a subacromial procedure. This identifies: (1) articular-sided cuff tears >50% thickness requiring repair, (2) biceps pathology requiring tenotomy/tenodesis, (3) labral tears, (4) arthritis. These findings may change surgical plan. I document all pathology systematically.'

Dangers at this step

Missed intra-articular pathology requiring treatment (partial articular-sided cuff tears, SLAP lesions, biceps pathology)
Cartilage damage from instruments during diagnostic arthroscopy
Inadequate assessment leading to wrong diagnosis or incomplete treatment

Step 3: Establish Lateral Portal

Establish Lateral Portal: Create lateral portal under direct arthroscopic visualization OR using anatomic landmarks. Position: 2-3cm distal to lateral acromion edge, in line with posterior border of clavicle. Use outside-in technique with spinal needle for localization, or establish from inside-out after entering subacromial space. This is primary WORKING portal for bursectomy and acromioplasty. Critical: stay >5cm from lateral acromion edge (axillary nerve).

Exam Pearl

Technical Tip: EXAM KEY: 'The lateral portal is my primary working portal for subacromial work. I position it 2-3cm below the lateral acromion edge, in line with the posterior clavicle. This gives optimal angle for acromioplasty. AXILLARY NERVE is 5-7cm below acromion - I ensure portal stays above this safety zone. I can localize with spinal needle under visualization after entering subacromial space.'

Dangers at this step

Axillary nerve injury from portal placed too distal (>5cm from acromion) - causes deltoid paralysis and shoulder abduction weakness
Poor working angle from portal too proximal or posterior making acromioplasty technically difficult
Deltoid injury from portal creation especially if multiple attempts

Step 4: Enter Subacromial Space

Enter Subacromial Space: Transition scope from glenohumeral joint to subacromial space. Technique: redirect scope posteriorly and superiorly from posterior portal, feel 'pop' as enter subacromial space. Alternatively, create new lateral or posterolateral portal directly into subacromial space. Subacromial space is potential space between acromion above and rotator cuff below, filled with bursa.

Exam Pearl

Technical Tip: EXAM KEY: 'I transition to the subacromial space from the posterior portal. As I redirect the scope superiorly and posteriorly, I feel a POP as I enter the space between the acromion and cuff. This is a potential space filled with inflamed bursa in impingement. I can also enter via lateral portal if established.'

Dangers at this step

Difficulty entering space from adhesions and severe inflammation requiring gentle blunt dissection
Cuff injury during entry particularly with forceful scope advancement
Wrong space identification (intra-deltoid plane) from incorrect trajectory

Step 5: Subacromial Bursectomy

Subacromial Bursectomy: Perform COMPLETE bursectomy using shaver and/or radiofrequency device to visualize anatomy. Remove all inflamed, hypertrophic bursal tissue. Start laterally, work medially to AC joint and anteriorly to CA ligament. Bursectomy is essential for visualization. Once bursa removed, can clearly see: acromion undersurface, CA ligament, cuff (bursal surface), greater tuberosity, AC joint. Maintain hemostasis.

Exam Pearl

Technical Tip: EXAM KEY: 'COMPLETE bursectomy is the MOST IMPORTANT step - without it, cannot see anatomy for safe acromioplasty. I use shaver and radiofrequency to remove all bursal tissue. In chronic impingement, bursa is massively hypertrophic. Once cleared, I can see the undersurface of the acromion, identify the CA ligament anteriorly, and assess the cuff. The bursa itself is often the pain generator.'

Dangers at this step

Incomplete bursectomy causing poor visualization and unsafe acromioplasty with risk of cuff injury
Cuff injury with aggressive shaver use - use oscillating mode with suction portal oriented away from cuff
Bleeding obscuring view requiring meticulous hemostasis with radiofrequency or epinephrine irrigation
Excessive fluid extravasation into soft tissues from prolonged high pump pressure

Step 6: Identify Acromial Anatomy and Assess Impingement

Identify Acromial Anatomy and Assess Impingement: After bursectomy, systematically identify: (1) Acromion undersurface - flat, curved, or hooked (Bigliani Type I, II, III), (2) Anteroinferior acromial spur (if present), (3) CA ligament insertion on anterior acromion, (4) AC joint medially, (5) Rotator cuff condition (intact, partial tear, full tear). Assess impingement: spur present, Type II/III acromion creating mechanical block, CA ligament thickened/calcified.

Exam Pearl

Technical Tip: EXAM KEY: 'I assess the acromion morphology: Type I FLAT (no impingement), Type II CURVED (mild), Type III HOOKED (significant mechanical impingement). I look for anteroinferior SPUR which is often the main impinging structure. The CA ligament may be thickened or calcified. I assess cuff from bursal side for partial or full-thickness tears. This assessment determines extent of decompression needed.'

Dangers at this step

Failure to identify true pathology leading to inappropriate or inadequate decompression
Unnecessary decompression in Type I acromion where impingement is not mechanical cause
Missing full-thickness cuff tear requiring repair not just decompression

Step 7: Coracoacromial Ligament Management

Coracoacromial Ligament Management: CA ligament management is CONTROVERSIAL. Options: (1) PRESERVE ligament (newer trend) - it provides superior restraint especially if cuff deficient, (2) RELEASE ligament (traditional) - improves decompression, or (3) DEBRIDE thickened portion only. If releasing: use electrocautery or radiofrequency to detach CA ligament from anteroinferior acromion. Release from lateral to medial. Preserve deltoid attachment above.

Exam Pearl

Technical Tip: EXAM KEY: 'CA ligament management is debated. TRADITIONAL teaching: release CA ligament for decompression. CURRENT trend: PRESERVE CA ligament as it acts as superior humeral head restraint, especially important with rotator cuff deficiency. I generally preserve or debride only thickened portion. If massive cuff tear present, I definitely preserve CA ligament as superior stabilizer.'

Dangers at this step

Deltoid detachment from aggressive anterior dissection extending beyond anteroinferior acromion edge
Loss of superior restraint if CA ligament released with massive cuff tear causing anterosuperior escape
Bleeding from CA ligament release requiring careful hemostasis

Step 8: Anteroinferior Acromioplasty - Initial Shaping

Anteroinferior Acromioplasty - Initial Shaping: Use motorized burr (typically 5.0-5.5mm round or oval burr) to perform acromioplasty. Start at ANTEROINFERIOR corner - this is primary impingement site. Goal: create FLAT Type I acromion undersurface. Remove anteroinferior spur and any hooked portion. Work from lateral to medial. Stay on BONE (protecting deltoid above). Limit resection to 5-7mm maximum thickness to preserve bone stock and deltoid origin.

Exam Pearl

Technical Tip: EXAM KEY: 'I use a burr to reshape the anteroinferior acromion. The goal is Type I FLAT undersurface. I start anterolaterally where impingement is worst and work medially. I stay directly ON BONE to protect deltoid origin which is on the superior surface. I limit resection to 5-7mm - over-resection causes deltoid dysfunction and acromion fracture. I create smooth contour, no sharp edges.'

Dangers at this step

Over-resection exceeding 7mm thickness causing deltoid dysfunction and acromion fracture risk
Deltoid detachment from burr extending off anterior edge onto superior surface
Inadequate decompression from too conservative resection leaving residual impingement
Acromial fracture during surgery or post-operatively from excessive bone removal
Burr injury to cuff below from improper burr orientation - always face cutting surface superiorly

Step 9: Complete Acromioplasty - Smooth Contouring

Complete Acromioplasty - Smooth Contouring: Continue acromioplasty working systematically from anterior to posterior, lateral to medial. Create smooth continuous flat undersurface. Remove all osteophytes. Test with probe - should have smooth gliding surface without catching. Common areas: anteroinferior corner (primary), lateral edge, anterior transition to CA ligament attachment. Stop medially at AC joint - do not enter joint unless diseased.

Exam Pearl

Technical Tip: EXAM KEY: 'I complete the acromioplasty by creating a smooth continuous flat surface. I test with probe - should glide smoothly without any catching or rough areas. The anteroinferior region is most critical but I ensure entire undersurface is flat. I stop at the AC JOINT medially - no reason to enter unless there is AC joint pathology.'

Dangers at this step

Irregular surface with rough areas causing recurrent symptoms and persistent impingement
AC joint violation when unnecessary causing post-operative AC joint pain
Excessive bleeding from bone requiring bone wax or epinephrine irrigation
Asymmetric resection creating unbalanced mechanics

Step 10: Assess Rotator Cuff from Bursal Surface

Assess Rotator Cuff from Bursal Surface: With clear visualization after bursectomy and acromioplasty, assess cuff thoroughly from bursal surface. Look for: full-thickness tears (already assessed from articular side), bursal-sided partial tears, cuff thinning, degenerative changes. Probe cuff to assess integrity. If full-thickness tear found: document size, consider repair. If partial bursal-sided tear <50%: debride only. If >50%: consider completion and repair.

Exam Pearl

Technical Tip: EXAM KEY: 'With excellent visualization, I thoroughly assess the cuff from the bursal surface. I probe the cuff to identify: full-thickness tears (felt tear extending through), bursal-sided partial tears (visible fraying), thinning. Combined with articular-side assessment, I determine if repair needed. PARTIAL tear <50% thickness from one side: DEBRIDEMENT only. Partial >50% or combined articular + bursal >50% total: consider REPAIR.'

Dangers at this step

Missing full-thickness tear requiring repair leading to poor outcomes
Underestimating partial tear depth causing inadequate treatment
Unnecessary completion of partial tear when debridement sufficient
Iatrogenic cuff injury from probing or instrumentation

Step 11: Distal Clavicle Excision (if indicated)

Distal Clavicle Excision (if indicated): If AC joint arthritis present (osteophytes, pain with cross-body test), perform distal clavicle excision. Identify AC joint capsule medially on acromion. Use burr to resect distal 5-7mm of clavicle. Resection creates 5-7mm gap. Preserve SUPERIOR and POSTERIOR capsule for stability. Remove anterior-inferior bone. Test stability - should have <5mm translation. If unstable, consider CA ligament preservation/reconstruction.

Exam Pearl

Technical Tip: EXAM KEY: 'I perform DCE if AC joint arthritis present - identified by osteophytes, joint space narrowing, positive cross-body test. I resect 5-7mm of distal clavicle using burr. CRITICAL: preserve SUPERIOR and POSTERIOR capsule to prevent AC joint instability. I remove anterior and inferior bone only. Post-op gap is 5-7mm. Inadequate resection (<5mm) causes persistent pain; excessive (>10mm) causes instability.'

Dangers at this step

AC joint instability from excessive resection or superior/posterior capsule violation causing cosmetic deformity and pain
Inadequate resection less than 5mm causing persistent AC joint pain
Superior capsule violation causing vertical instability
Excessive bleeding from clavicle bone requiring careful hemostasis

Step 12: Hemostasis and Final Assessment

Hemostasis and Final Assessment: Achieve hemostasis using radiofrequency, electrocautery, or epinephrine irrigation. Reduce arthroscopic pump pressure to identify bleeding. Remove any loose bone fragments or debris. Final assessment: smooth acromion undersurface, no residual spur or osteophytes, intact rotator cuff (or repaired if torn), adequate subacromial space created, AC joint resected if needed. Test impingement signs: abduction and rotation should not cause mechanical block.

Exam Pearl

Technical Tip: EXAM KEY: 'I achieve meticulous hemostasis - post-op hematoma causes pain and stiffness. I reduce pump pressure to unmask bleeding sources. I remove all debris and loose fragments. Final check: smooth acromion, no mechanical block with motion, cuff intact. I test impingement - with decompression, cuff should glide freely under acromion through full ROM.'

Dangers at this step

Persistent bleeding causing post-operative hematoma, pain and stiffness
Retained loose bodies causing mechanical symptoms and chondral damage
Incomplete decompression from inadequate assessment
Missed pathology not addressed during surgery

Step 13: Assess Range of Motion

Assess Range of Motion: Test passive ROM: forward flexion, abduction, internal and external rotation. Should achieve full or near-full ROM smoothly without mechanical impingement. No catching or grinding. If limited ROM, assess for: inadequate decompression, adhesive capsulitis requiring manipulation, cuff pathology. Document ROM. Gentle manipulation can be performed under anesthesia if frozen shoulder component identified.

Exam Pearl

Technical Tip: EXAM KEY: 'I test passive ROM with decompression complete. Should achieve smooth full motion without catching. If ROM limited: assess reason - inadequate decompression (revise), adhesive capsulitis (gentle manipulation), or cuff tear (repair). I document final ROM. Gentle manipulation under anesthesia is safe and effective for concomitant stiffness.'

Dangers at this step

Forceful manipulation causing iatrogenic fracture (proximal humerus, acromion) or cuff tear
Unrecognized inadequate decompression causing persistent symptoms
Brachial plexus injury from aggressive manipulation especially in stiff shoulders

Step 14: Closure and Injection

Closure and Injection: Irrigate subacromial space thoroughly to remove debris. Inject long-acting local anesthetic with epinephrine into subacromial space for post-operative pain control (e.g., 20mL 0.25% Marcaine with 1:200,000 epinephrine). Consider corticosteroid injection (controversial - may impair healing). Remove instruments under direct visualization. Remove cannulas. Close portals with nylon or absorbable suture. Apply sterile dressings.

Exam Pearl

Technical Tip: EXAM KEY: 'I irrigate thoroughly and inject long-acting local anesthetic into the subacromial space - this provides excellent post-operative pain control for 12-18 hours. I typically inject 20mL of 0.25% Marcaine with epinephrine. Corticosteroid injection is CONTROVERSIAL - may improve pain but concerns about healing impairment especially if cuff repair performed. I close portals with simple sutures.'

Dangers at this step

Inadequate irrigation leaving debris causing inflammation
Local anesthetic toxicity from excessive dose (rare but serious - cardiac toxicity)
Skin bridge necrosis if portals placed too close together
Infection risk from inadequate sterile technique

Step 15: Post-operative Protocol and Patient Education

Post-operative Protocol and Patient Education: Apply sling for COMFORT only (not mandatory). Initiate early mobilization protocol: IMMEDIATE active and passive ROM exercises (no restriction for isolated SAD). PT starting day 1-2. Strengthening at 2-4 weeks. Return to activity 4-8 weeks. Emphasize: this is low restriction surgery if isolated decompression. Educate on wound care, pain management, therapy compliance. Different protocol if concurrent cuff repair.

Exam Pearl

Technical Tip: EXAM KEY: 'Post-operative protocol for isolated SAD is MINIMAL restriction. Sling for comfort only 1-3 days. I encourage IMMEDIATE ROM - both active and passive. This is fundamentally different from cuff repair which requires protection. Early motion prevents stiffness. PT focuses on ROM first, then rotator cuff and scapular strengthening. Most patients return to full activity 6-12 weeks. Success depends on appropriate patient selection and addressing true mechanical impingement.'

Dangers at this step

Over-protection causing iatrogenic stiffness and frozen shoulder
Inadequate therapy compliance leading to poor outcomes
Wrong patient expectations regarding pain resolution timeline (gradual over 3-6 months, not immediate)
Recurrence if underlying biomechanics (scapular dyskinesis, poor posture) not addressed with therapy

Complications

Major Complications: Recognition, Prevention, and Management

Additional Complications:

Recurrent impingement from inadequate decompression (incomplete spur removal, insufficient acromioplasty)
Suprascapular nerve injury from excessive medial dissection (rare <0.5%)
Infection deep or superficial (0.5-1% - lower than open surgery)
AC joint instability if DCE performed with excessive resection >10mm or capsule violation
Bleeding/hematoma requiring drainage if massive
Instrument breakage with retained fragment
Fluid extravasation into soft tissues (extensive subcutaneous emphysema, pneumothorax rare)

Post-operative Care

ISOLATED SUBACROMIAL DECOMPRESSION (No Cuff Repair):

Sling for comfort only: 1-3 days (remove when comfortable)
ROM: IMMEDIATE active and passive exercises - NO restrictions
Physical therapy: Start day 1-2, focus on ROM restoration
Strengthening: Begin 2-4 weeks with rotator cuff and scapular stabilizers
Return to work: Sedentary 1-2 weeks, manual labor 6-8 weeks
Return to sport: Non-contact 6-8 weeks, contact 10-12 weeks
Key message: Early motion prevents stiffness, this is NOT a protected procedure

WITH CONCURRENT ROTATOR CUFF REPAIR:

Sling immobilization: 4-6 weeks continuous
ROM: Passive only 0-6 weeks, active-assisted 6-12 weeks, active after 12 weeks
Physical therapy: Controlled passive ROM only, protect repair
Strengthening: Delayed until 12+ weeks
Return to activity: Prolonged 4-6 months
Different protocol - repair protection takes precedence

Pain Management:

Multimodal analgesia: acetaminophen, NSAIDs (if no contraindication)
Opioids: minimal use, 3-5 days maximum
Subacromial local anesthetic injection provides 12-18 hours excellent pain control
Ice therapy first 48-72 hours
Expect gradual pain improvement over 3-6 months (not immediate resolution)

Wound Care:

Waterproof dressings 48 hours
Shower after 48 hours, no submersion 2 weeks
Suture removal 10-14 days if non-absorbable
Monitor for infection signs (increasing pain, erythema, drainage, fever)

Follow-up Schedule:

2 weeks: wound check, suture removal, ROM assessment
6 weeks: pain and function assessment, advance strengthening
3 months: outcome evaluation, return to activity clearance
6-12 months: final outcome assessment

Exam Viva Scenarios

Practice these scenarios to excel in your viva examination

VIVA SCENARIOStandard

EXAMINER

"A 52-year-old manual laborer presents with 18 months of anterolateral shoulder pain worse with overhead activities. He has failed 6 months of physiotherapy and two subacromial corticosteroid injections. Examination shows positive Neer and Hawkins signs, full passive ROM, and 4/5 strength in abduction. MRI shows subacromial bursal thickening, Bigliani Type III hooked acromion with anteroinferior spur, and intact rotator cuff without tears. How would you manage this patient?"

EXCEPTIONAL ANSWER

This patient has classic subacromial impingement syndrome with appropriate conservative management failure and clear structural pathology making him a good surgical candidate. I would confirm the diagnosis and surgical indication, then proceed with arthroscopic subacromial decompression. For diagnosis confirmation, I would verify the MRI findings showing Type III hooked acromion with anteroinferior spur - this represents TRUE mechanical impingement. The intact rotator cuff is important - this is isolated impingement, not cuff tear pathology. I would perform a diagnostic/therapeutic subacromial injection with local anesthetic and corticosteroid - if he achieves significant temporary pain relief (>50% improvement for several weeks), this confirms subacromial pathology and predicts good surgical outcome. Given 18 months symptoms, failed adequate conservative treatment (PT and injections), positive clinical examination (Neer and Hawkins signs), and structural abnormality (Type III acromion with spur), I would offer arthroscopic subacromial decompression. The surgical technique would include: (1) diagnostic glenohumeral arthroscopy to confirm intact cuff from articular side and rule out other pathology, (2) entry into subacromial space with complete thorough bursectomy to visualize anatomy, (3) identification of Type III hooked morphology and anteroinferior spur, (4) arthroscopic acromioplasty using burr to create flat Type I undersurface removing spur and hook, limiting resection to 5-7mm maximum, (5) preservation of coracoacromial ligament (modern approach) or debridement of only thickened portions, (6) assessment for AC joint arthritis requiring distal clavicle excision if present. Post-operatively with isolated SAD, early mobilization protocol with immediate ROM exercises and sling for comfort only 1-3 days. I would counsel realistic expectations - gradual pain improvement over 3-6 months with 75-85% good-excellent results in appropriately selected patients. I would also discuss recent evidence from CSAW trial showing no benefit over placebo in unselected patients, but emphasize his Type III acromion with visible spur represents true mechanical impingement likely to benefit from decompression.

VIVA SCENARIOStandard

EXAMINER

"You perform arthroscopic subacromial decompression on a 48-year-old patient with 2-year history of shoulder impingement. At 6 months post-operatively, the patient returns with persistent anterolateral shoulder pain unchanged from pre-operative levels. He has been compliant with physiotherapy. How would you approach this patient?"

EXCEPTIONAL ANSWER

This represents failed subacromial decompression - a challenging scenario requiring systematic evaluation to determine the cause of persistent pain and appropriate next steps. My approach would be comprehensive re-evaluation to identify why the surgery failed. First, I would obtain detailed history: confirm pain location and character (is this the same pain or different?), assess for new symptoms suggesting complications, review operative report to understand what was done surgically (extent of acromioplasty, CA ligament management, concurrent procedures), and evaluate therapy compliance and post-operative course. Second, thorough physical examination: assess active and passive ROM (stiffness suggesting frozen shoulder complication?), strength testing with cuff lag signs (missed or new cuff tear?), impingement signs (Neer, Hawkins - still positive suggests inadequate decompression), AC joint examination with cross-body adduction test (missed AC pathology?), cervical spine examination for referred pain, and palpation for focal tenderness. Third, advanced imaging: AP, axillary lateral, and scapular-Y radiographs to assess acromial morphology (was adequate bone resected?), anteroinferior spur still present, os acromiale previously missed, AC joint arthritis, and rule out acromion fracture. CT scan provides excellent bone detail showing extent of previous acromioplasty, residual spur, and os acromiale. MRI evaluates cuff integrity (new tear, progression of partial tear), bursal recurrence, and other soft tissue pathology. Fourth, diagnostic injection: subacromial injection with local anesthetic - if achieves temporary relief, suggests mechanical problem still present (inadequate decompression, residual impingement). Fifth, differential diagnosis consideration: inadequate initial decompression (most common - retained anteroinferior spur, insufficient acromioplasty), wrong initial diagnosis (pain not from mechanical impingement - cervical referred pain, fibromyalgia, complex regional pain syndrome), missed pathology (os acromiale causing unstable fragment impingement, AC joint arthritis, full-thickness cuff tear), complications (deltoid dysfunction from over-resection, frozen shoulder from over-protection, acromion fracture), or multifactorial pain (psychological factors, secondary gain, worker's compensation). Management depends on findings: if inadequate decompression confirmed on imaging (residual spur, minimal bone resection) AND positive injection test, consider revision arthroscopic SAD with more aggressive acromioplasty. If os acromiale identified, surgical options include ORIF if unstable or excision if small. If AC joint pathology, arthroscopic DCE. If frozen shoulder, manipulation under anesthesia and capsular release. If wrong diagnosis or non-mechanical pain, avoid further surgery - focus on conservative management, pain psychology referral, treat underlying conditions. I would counsel realistic expectations - revision SAD has lower success rate (60-70%) than primary surgery, and eliminating non-mechanical causes is critical before revision.

VIVA SCENARIOStandard

EXAMINER

"You are performing arthroscopic subacromial decompression. During the acromioplasty with the burr, you notice significant bleeding obscuring your view. When you finally achieve hemostasis and clear visualization, you probe the rotator cuff and identify a 2cm full-thickness supraspinatus tear that you believe is iatrogenic. How would you manage this intra-operative complication?"

EXCEPTIONAL ANSWER

This is a serious intra-operative complication requiring immediate recognition, honest assessment, and appropriate surgical management to optimize patient outcome. My immediate response would be methodical and systematic. First, I would stop the acromioplasty immediately and control bleeding using radiofrequency ablation and epinephrine irrigation (1:200,000) to achieve clear visualization. Second, I would perform thorough cuff assessment: size of tear (measure in AP and medial-lateral dimensions), shape (crescent vs U-shaped vs L-shaped), quality of tissue (good, fair, poor), reducibility to footprint on greater tuberosity (mobile vs retracted), and examine from both bursal and articular sides. The tear appears to be 2cm which is medium-sized and likely repairable. Third, I would consider my options: (A) Proceed with immediate repair - preferred option if patient consented for possible cuff repair, surgeon capable of performing repair, appropriate instruments available, and patient medically stable for longer procedure. (B) Abort procedure and stage repair - only if unable to repair (inadequate consent, lack of expertise/equipment), but this is suboptimal. Fourth, assuming I proceed with repair, I would execute standard arthroscopic rotator cuff repair technique: prepare footprint on greater tuberosity with shaver removing soft tissue and slight decortication to bleeding bone, insert suture anchors (typically 2-3 for 2cm tear) in appropriate positions on medial greater tuberosity, pass sutures through torn cuff using various techniques (simple suture, mattress), reduce cuff to footprint anatomically, and tie sutures securing repair. I would assess repair integrity: probe repair to ensure secure fixation, test ROM to ensure no excessive tension, and confirm footprint coverage. Fifth, post-operative management changes substantially: convert to rotator cuff repair protocol NOT isolated SAD protocol - sling immobilization 4-6 weeks, passive-only ROM 0-6 weeks protecting repair, active-assisted ROM 6-12 weeks, strengthening delayed until 12+ weeks, and return to full activity 4-6 months. Sixth, critical communication: inform patient immediately post-operatively about complication, explain iatrogenic tear was recognized and repaired, document thoroughly in operative report, and discuss changed rehabilitation protocol and timeline. Seventh, document meticulously in operative report: describe mechanism of injury (burr injury during acromioplasty), tear characteristics, repair technique performed, and post-operative discussion with patient. This is a medical-legal situation requiring complete honesty and documentation. I would also reflect on prevention: this injury likely occurred from improper burr orientation or inadequate visualization. For future cases, ensure complete bursectomy before acromioplasty, orient burr cutting surface SUPERIORLY toward bone never inferiorly toward cuff, probe cuff before and after acromioplasty, and maintain meticulous hemostasis throughout.

Arthroscopic Subacromial Decompression - Exam Summary

High-Yield Exam Summary

References

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Arthroscopic Subacromial Decompression (Acromioplasty) for Impingement Syndrome