Arthroscopic SLAP Repair (Shoulder)

Surgical Indications

Absolute Indications

• Unstable Snyder type II SLAP lesion with greater than 5 mm detachment, positive peel-back sign, and symptoms refractory to 3-6 months of non-operative care including physiotherapy and activity modification
• Type II SLAP with associated paralabral cyst causing suprascapular nerve compression (cyst decompression and labral repair indicated)
• Type IV SLAP with greater than 30 percent biceps tendon involvement in a young patient with healthy tendon tissue suitable for repair

Relative Indications

• Type III bucket-handle tear with mechanical symptoms (resect or repair the fragment based on size and reducibility)
• Overhead athlete with documented type II SLAP and failed rehabilitation including posterior capsular stretching
• Concomitant pathology (partial cuff tear, Bankart lesion) requiring arthroscopic intervention where SLAP repair can be performed concurrently

Contraindications

Absolute:

• Asymptomatic SLAP lesion found incidentally on imaging (normal variants and degenerative changes are common and often asymptomatic)
• Patient older than 50 years with type II SLAP and biceps tendinopathy — biceps tenodesis is preferred

Relative:

• Isolated type I degenerative fraying without mechanical symptoms (debridement only if symptomatic)
• Worker's compensation or high-demand labourer without clear mechanical block (outcomes less predictable)
• Untreated GIRD greater than 20 degrees or scapular dyskinesis (address first)

Evidence for Non-Operative Treatment

Physiotherapy and Activity Modification

• Posterior capsular stretching and scapular stabilisation exercises improve symptoms in 50-70 percent of overhead athletes with type II SLAP at 3-6 months
• A prospective cohort (Edwards 2015) of 179 patients showed that 55 percent avoided surgery with a structured rehabilitation programme focusing on GIRD correction and rotator cuff endurance
• Key components: sleeper stretch, cross-body adduction, scapular retraction and external rotation strengthening; duration minimum 3 months before considering surgery

Role of Injections

• Corticosteroid injection into the glenohumeral joint or biceps sheath provides short-term relief in 40-60 percent but does not address the underlying labral detachment
• Not routinely recommended as definitive treatment; useful as a diagnostic test when pain relief correlates with improved function

Evidence for Surgery — Repair versus Tenodesis

Suture Anchor Repair Outcomes

• Level II evidence (Brockmeier 2009, AJSM) of 47 patients undergoing type II SLAP repair showed 87 percent good-to-excellent results at 2 years with return to sport in 74 percent of overhead athletes
• A systematic review (Gorantla 2010) of 8 studies (326 patients) reported mean ASES scores improving from 45 to 85 and 63-85 percent return to previous level of sport
• Complications: stiffness requiring re-operation in 5-10 percent; persistent pain in 10-15 percent; anchor-related chondral injury if placed too proud

Biceps Tenodesis versus Repair

• Multiple comparative studies (including Level I RCT by Cvetanovich 2020) demonstrate that biceps tenodesis in patients older than 40 years yields equivalent or superior patient-reported outcomes with lower re-operation rates for stiffness and failure
• Tenodesis eliminates the unstable pain generator and allows faster rehabilitation without biceps loading restrictions
• In overhead athletes under 30 years with isolated type II SLAP and healthy biceps, repair remains preferred to preserve the native anchor and throwing mechanics

Key Evidence

Superior Labrum and Biceps Anchor Anatomy

Biceps-Labral Complex

The long head of biceps originates from the supraglenoid tubercle and superior labrum. The superior labrum is a fibrocartilaginous structure continuous with the biceps tendon, providing stability to the biceps anchor and contributing to glenohumeral stability through the superior glenohumeral ligament and middle glenohumeral ligament.

• Vascular supply: The superior labrum receives blood from the suprascapular and subscapular arteries via the biceps tendon; the inner third is relatively avascular, explaining poor healing potential without repair.
• Innervation: Branches of the suprascapular nerve and lateral pectoral nerve provide proprioceptive feedback; SLAP lesions can produce referred pain to the lateral shoulder and biceps.

Normal Variants versus Pathologic Detachment

• Sublabral foramen: Present in 10-15 percent of shoulders; a recess exists between the anterosuperior labrum and glenoid but the biceps anchor remains attached. No peel-back. Do not repair.
• Buford complex: Absent anterosuperior labrum with a cord-like middle glenohumeral ligament running from the superior labrum to the subscapularis. Present in 1-2 percent. Repair causes loss of external rotation.
• Meniscoid labrum: Redundant superior labrum without detachment or peel-back. Common in young patients. Observe.
• True type II SLAP: Greater than 5 mm detachment of the biceps-labral complex from the glenoid with positive peel-back on abduction-external rotation.

Portal Anatomy for SLAP Repair

Standard shoulder arthroscopy portals are used with specific considerations for superior labral work.

• Posterior portal: 2 cm inferior and 1 cm medial to the posterolateral acromion corner. Primary viewing portal. Provides excellent visualisation of the superior labrum and biceps anchor with a 30-degree scope; switch to 70-degree for posterosuperior quadrant.
• Anterior portal: Lateral to the coracoid, through the rotator interval. Working portal for labral preparation and suture management. Place slightly superior for better angle on superior labrum.
• Anterosuperior (AS) portal: 1 cm lateral to the coracoid, through the rotator interval just anterior to the biceps tendon. Ideal for superior anchor placement and biceps tenodesis preparation.
• Neviaser (supraspinatus) portal: 1 cm medial to the acromion in the supraspinatus fossa. Useful for posterosuperior anchor placement and viewing the peel-back phenomenon.

Positioning and Preparation

Patient position: Lateral decubitus on a beanbag with the operative arm in 20-30 degrees abduction, 10 degrees forward flexion, and 5-10 pounds of traction. The lateral decubitus position allows dynamic testing of the peel-back phenomenon by bringing the arm into 90 degrees abduction and external rotation. Beach-chair is an acceptable alternative but limits the ability to assess peel-back dynamically.

Anaesthesia: General anaesthesia with interscalene block for postoperative analgesia. Hypotensive anaesthesia (MAP 60-70 mmHg) improves visualisation. No tourniquet.

Consent: Counsel regarding stiffness (5-10 percent requiring re-operation), persistent pain, biceps anchor failure, anchor pull-out or chondral injury, suprascapular or axillary nerve injury (less than 1 percent), and the possibility of conversion to biceps tenodesis intraoperatively if tissue quality is poor.

Step-by-Step Arthroscopic SLAP Repair (Type II)

Step 1: Diagnostic Arthroscopy and Dynamic Testing

Establish the posterior portal and perform a systematic 360-degree inspection. Probe the superior labrum to assess mobility. Bring the arm into 90 degrees abduction and external rotation while viewing from the posterior portal to elicit the peel-back sign. Document the extent of detachment (clock-face positions) and any associated pathology (Bankart, Hill-Sachs, cuff tear, paralabral cyst).

Step 2: Portal Placement and Labral Preparation

Establish the anterior working portal through the rotator interval. Use a shaver or radiofrequency device to debride degenerative tissue and create a bleeding bony bed on the glenoid. For type II lesions, elevate the labrum 5-8 mm medially to expose cancellous bone for healing. Avoid excessive medial debridement that risks suprascapular nerve injury.

Step 3: Anchor Placement

Typically two or three 1.4-1.8 mm all-suture or PEEK anchors are placed at the 10:30, 12:00, and 1:30 positions (right shoulder) or equivalent. Drilling angle must be 45 degrees or greater to the glenoid surface to avoid articular penetration. The anterosuperior or Neviaser portal provides the optimal trajectory for superior anchors.

Step 4: Suture Passage and Knot Tying

Pass sutures through the labrum using a suture lasso or penetrator, creating horizontal mattress or simple stitches that capture both the labrum and the biceps tendon fibres. Tie arthroscopic knots (usually SMC or Weston) on the capsular side to avoid prominence on the articular surface. Ensure the knots are not overtensioned, which can restrict external rotation.

Step 5: Biceps Tenodesis (When Indicated)

If tenodesis is chosen (older patient, poor biceps quality), release the biceps from the labrum, whipstitch the tendon, and secure it in the bicipital groove with an interference screw or cortical button via the anterosuperior portal. This eliminates the unstable anchor while preserving elbow flexion strength.

Step 6: Final Assessment and Closure

Reassess the repair with dynamic testing — there should be no peel-back and the biceps anchor should be stable with probing. Close portals with absorbable sutures. Apply a sling with abduction pillow.

Intra-operative and Early Complications

Anchor-Related Issues

• Articular penetration: Drill angle less than 45 degrees to the glenoid surface risks violating the articular cartilage. Incidence 1-3 percent in series; prevented by using a 70-degree scope and confirming drill trajectory on both AP and axillary views.
• Anchor pull-out: Occurs with poor bone quality or overtensioning. Rate less than 2 percent with modern all-suture anchors. Management: remove anchor, re-drill at a different angle or use a larger anchor.
• Proud anchor: Causes mechanical catching and chondral wear. Always countersink or use knotless anchors flush with the glenoid surface.

Nerve Injury

• Suprascapular nerve: At risk during medial debridement or anchor placement near the spinoglenoid notch. Incidence less than 1 percent. Presents with infraspinatus weakness and posterior shoulder pain. Most resolve with observation; exploration if no recovery at 3 months.
• Axillary nerve: Rare with superior labral work but possible with inferior extension or stray inferior portal. Monitor deltoid function postoperatively.

Post-operative Complications

Stiffness

The most common complication after SLAP repair, occurring in 5-15 percent of patients. Risk factors include age greater than 40, diabetes, and aggressive early rehabilitation. Management: prolonged physiotherapy with capsular stretching; manipulation under anaesthesia or arthroscopic capsular release if no improvement by 4-6 months.

Persistent Pain and Failure

• Causes: missed concomitant pathology (GIRD, Bankart, cuff), poor tissue quality, overtensioned repair, anchor chondral injury, or untreated biceps tendinopathy.
• Re-operation rate: 5-10 percent overall; higher in overhead athletes (up to 19 percent in some series).
• Revision options: biceps tenodesis (most common), capsular release, or debridement of failed repair.

Post-operative Protocol

Phase 1: Protection (Weeks 0-4)

• Sling with abduction pillow for 4-6 weeks (longer for overhead athletes)
• Pendular exercises and elbow/wrist ROM from day 1
• No active biceps contraction or resisted supination for 8 weeks
• Scapular setting and isometric rotator cuff exercises from week 2

Phase 2: Motion (Weeks 4-10)

• Wean sling at 4-6 weeks
• Begin passive and active-assisted forward flexion and external rotation at 0 degrees abduction
• Progress external rotation to 30-45 degrees by week 8
• Introduce horizontal adduction and sleeper stretch at week 8-10 if pain-free
• Scapular stabilisation and theraband external rotation from week 6-8

Phase 3: Strengthening (Weeks 10-16)

• Full active ROM expected by week 12
• Progressive rotator cuff and scapular strengthening with theraband and light weights
• Biceps isometrics at week 10; resisted elbow flexion/supination from week 12
• Address any residual GIRD with posterior capsular mobilisation

Phase 4: Sport-Specific (Weeks 16-6 months)

• Interval throwing programme begins at 4-5 months for overhead athletes
• Full return to competitive sport at 6-9 months once pain-free with sport-specific drills and symmetric strength
• Criteria: full painless ROM, greater than 90 percent strength symmetry, successful completion of interval programme

Special Considerations — Overhead Athletes

• Pre-operative GIRD greater than 20 degrees should be addressed with posterior capsular release at the time of SLAP repair.
• Biceps tenodesis is generally avoided in elite throwers under 30 years unless the biceps is clearly pathologic, as the native anchor contributes to dynamic stability during late cocking.
• Return-to-sport rates are lower (50-70 percent) in overhead athletes than in non-overhead patients (85-95 percent); realistic pre-operative counselling is essential.