SLAP Lesion
Upper LimbOverview
A SLAP lesion is a tear of the superior glenoid labrum that extends from the anterior to posterior aspect, often involving the biceps tendon anchor. These injuries commonly occur in overhead athletes and from falls on an outstretched arm, causing significant shoulder dysfunction and instability.
Pathophysiology
The superior labrum acts as an anchor for the long head of biceps and contributes to glenohumeral stability. SLAP lesions typically result from repetitive microtrauma in overhead activities or acute trauma, causing the labrum to detach from the glenoid rim. This compromises the superior glenohumeral ligament and destabilizes the humeral head, leading to altered scapulohumeral rhythm, compensatory muscle tension, and progressive degenerative changes.
Patient Education
SLAP lesions often require activity modification and structured rehabilitation to restore scapular stability and neuromuscular control; surgical intervention may be necessary if conservative management fails after 3-6 months.
Typical Presentation
Site
Anterior and superior shoulder, often with deep intracapsular pain; may refer to posterior shoulder
Quality
Deep ache, instability sensation, clicking or clunking, sharp pain with specific movements
Intensity
Moderate to severe (5-8/10), worse with overhead activities and may improve with rest
Aggravating
Overhead throwing or reaching, carrying heavy objects, sleeping on affected shoulder, aggressive stretching, rapid acceleration movements
Relieving
Rest, arm support with sling, ice application, gentle range of motion exercises, scapular stabilization
Associated
Scapular dyskinesis, weakness in external rotators, positive O'Brien's test, dead arm sensation, possible apprehension or instability, clicking with movement, reduced overhead reach
Orthopaedic Tests
Crank Test (Abduction-External Rotation Test)
Procedure
Patient supine, shoulder abducted to 90°, elbow flexed to 90°. Examiner externally rotates the shoulder maximally while stabilizing the scapula.
Positive Finding
Reproduction of anterior shoulder pain or apprehension in the 12 o'clock to 1 o'clock position of the glenoid
Sensitivity / Specificity
72% / 97%
Liu et al., 1996, American Journal of Sports Medicine
Interpretation
Highly specific for SLAP lesion; positive result suggests biceps-labral pathology at the superior labrum. Excellent for ruling in SLAP when positive.
O'Brien's Test (Active Compression Test)
Procedure
Patient seated or standing, shoulder flexed 90°, internally rotated (thumb pointing down), elbow extended. Examiner applies downward pressure; test repeated with shoulder externally rotated.
Positive Finding
Deep anterior shoulder pain with thumb-down (internal rotation) position that improves or resolves with thumb-up (external rotation) position
Sensitivity / Specificity
72% / 95%
O'Brien et al., 1998, American Journal of Sports Medicine
Interpretation
Highly specific for SLAP lesion; compression in adduction mimics load on superior labrum. Positive result suggests biceps anchor pathology.
Anterior Slide Test
Procedure
Patient seated or standing, hands on hips with thumbs posteriorly. Examiner stabilizes scapula and applies anterosuperior force through the elbow in this position.
Positive Finding
Reproduction of anterior shoulder pain, clicking, or clunking in the glenohumeral joint
Sensitivity / Specificity
73% / 97%
Jobe et al., 1995, Clinics in Sports Medicine
Interpretation
Highly specific for SLAP pathology; tests load and shift of biceps anchor. Excellent specificity for ruling in SLAP when positive.
Biceps Load Test
Procedure
Patient supine, shoulder abducted to 120°, elbow flexed to 90°, externally rotated. Patient attempts elbow flexion against examiner resistance while maintaining arm position.
Positive Finding
Reproduction of deep anterior shoulder pain with resisted elbow flexion, indicating load on biceps anchor
Sensitivity / Specificity
71% / 97%
Kibler et al., 2009, American Journal of Sports Medicine
Interpretation
Excellent specificity for SLAP lesion; isolates force through biceps tendon anchor at superior labrum. Positive result strongly suggests SLAP pathology.
Speed's Test (Biceps Load Test II)
Procedure
Patient seated or standing, shoulder flexed to 90°, elbow extended, forearm supinated. Examiner applies downward pressure while patient resists.
Positive Finding
Anterior shoulder pain localized to the biceps groove or anterior joint line
Sensitivity / Specificity
50% / 53%
Interpretation
Low sensitivity and specificity for isolated SLAP; better used to assess biceps tendon pathology generally. May be positive in SLAP but not diagnostic.
Compression-Rotation Test (Crank Test with Load)
Procedure
Patient supine, shoulder abducted 90° and externally rotated 90°, elbow extended. Examiner applies axial compression through the humerus while performing gentle internal-external rotation oscillations.
Positive Finding
Reproduction of sharp superior or posterior shoulder pain, or sensation of catching/clicking within the joint
Sensitivity / Specificity
See current literature / See current literature
Interpretation
Compressive loading combined with rotation may elicit labral pathology. Clinical utility emerging but requires further validation in systematic reviews.
⚠ Red Flags
- •Severe acute trauma with immediate loss of function suggesting complete labral detachment
- •Neurovascular compromise (numbness, tingling, color changes)
- •Signs of infection (fever, expanding swelling, warmth)
- •Complete loss of active range of motion unresponsive to 2 weeks conservative care
- •Progressive neurological deficit or persistent paraesthesia in radial nerve distribution
⚡ Yellow Flags
- •Worker's compensation claim affecting motivation for rehabilitation
- •Fear-avoidance behavior limiting normal activity participation
- •Catastrophizing about shoulder function and return to sport
- •Dependence on passive modalities without active participation
- •Poor compliance with home exercise program
- •Psychological distress related to loss of athletic identity
- •Overtraining behaviors in athletes prior to injury
Osteopathic Techniques
Region
Scapulothoracic articulation and surrounding musculature
Technique
Soft Tissue
Rationale
Addressing myofascial restrictions in the scapular stabilizers (lower trapezius, serratus anterior, rhomboids) restores scapular mechanics and reduces compensatory tension that perpetuates labral irritation
Region
Glenohumeral joint and rotator cuff
Technique
Articulation
Rationale
Gentle progressive mobilization restores normal arthrokinematics, improves proprioception, and promotes synovial nutrition to the healing labrum without destabilizing forces
Region
Cervicothoracic spine and thoracic outlet
Technique
MET
Rationale
Releasing cervicothoracic restrictions and addressing upper crossed syndrome reduces neural tension on the brachial plexus and improves scapular positioning for optimal labral loading
Region
Posterior shoulder capsule and infraspinatus
Technique
Soft Tissue
Rationale
Posterior capsule tightness is common in overhead athletes and contributes to anterior labral stress; releasing this tissue reduces shear forces on the labrum
Region
Thoracic spine with emphasis on T4-T7
Technique
HVLA
Rationale
Restoring thoracic extension mobility improves scapular positioning and reduces compensatory stress through the glenohumeral joint; should only be applied in later rehabilitation stages
Region
Lymphatic drainage of shoulder girdle
Technique
Lymphatic
Rationale
Enhancing lymphatic drainage reduces post-inflammatory exudate and supports tissue healing in the labral region
Add-On Approaches
Chinese Medicine
Acupuncture targeting LI-15 (Jianyu) and SI-9 (Jianzhen) points combined with moxibustion to improve local circulation and reduce inflammation; herbal support with tonifying Yang and promoting blood flow
Chiropractic
Scapular manipulation techniques and glenohumeral mobilization combined with soft tissue therapy to restore joint mechanics; shoulder-specific adjustments may be considered in select cases
Physiotherapy
Progressive scapular stabilization exercises, rotator cuff strengthening, neuromuscular re-education, proprioceptive training, and sport-specific functional exercises; emphasis on eccentric loading for overhead athletes
Remedial Massage
Deep tissue work on scapular stabilizers, myofascial release of pectoralis minor and major, soft tissue mobilization of rotator cuff muscles, and trigger point therapy to reduce compensatory tension patterns
Rehabilitation Exercises
Pendulum Circles (Codman's Pendulum)
Posterior Shoulder Capsule Stretch (Cross-Body)
Prone Scapular Squeeze (Rhomboid Activation)
Prone Horizontal Abduction at 90°
External Rotation with Arm at Side (Lateral Rotation)
Prone External Rotation (90/90 Position)
Scapular Retraction Against Wall
Lower Trapezius Activation (Prone Y Position)
Serratus Anterior Punch (Modified Push-Up Plus)
Single-Arm Stability Ball Wall Holds
Eccentric External Rotation (Advanced Overhead)
Sleeper Stretch with Soft Tissue Release
Referral Criteria
- •Positive MRI or ultrasound confirming SLAP lesion with structural instability requiring imaging correlation
- •No improvement after 6-8 weeks of conservative osteopathic and physiotherapy management
- •Persistent instability or dead arm sensation affecting function or sport participation
- •Consultation with orthopedic surgeon if considering surgical intervention (SLAP repair or biceps tenodesis)
- •Positive or worsening neurological signs suggesting brachial plexus involvement
- •Return-to-sport decision for athletes requires sports medicine or orthopedic clearance
- •Chronic pain with significant disability warranting pain management specialist consultation