Biceps Tendinopathy and Subluxation: Yergason's Test and Bicipital Groove Mechanics
In short
Transverse humeral ligament rupture allows the long head of the biceps to subluxate out of its groove; Speed's and Yergason's tests identify sheath instability.
In this guide (4 sections)
Anatomy of the Bicipital Groove and Pulley System
The Long Head of the Biceps (LHB) tendon traverses an extraordinarily tortuous path. Originating from the supraglenoid tubercle and superior labrum, it travels intra-articularly across the top of the humeral head, makes a 90-degree turn, and exits the joint capsule into the narrow bicipital groove between the greater and lesser tuberosities.
Stability of the LHB tendon inside the groove depends on a delicate soft-tissue 'pulley complex' composed of the superior glenohumeral ligament, coracohumeral ligament, and fibers from the subscapularis tendon. If the subscapularis tears or the transverse humeral ligament ruptures, the biceps tendon slips medially out of its groove (biceps subluxation), generating painful mechanical popping with every shoulder rotation.
Diagnostic Special Testing Battery
| Clinical Test | Examination Technique | Positive Test Criteria | Specific Pathology Identified | |
|---|---|---|---|---|
| Yergason's Test | Elbow flexed 90°, forearm pronated; examiner resists active supination while patient externally rotates shoulder | Palpable snap/pop of tendon jumping out of groove, or localized groove pain | Identifies transverse ligament tear and medial biceps subluxation | |
| Speed's Test | Shoulder forward flexed 90°, elbow fully extended, forearm fully supinated; examiner pushes arm down against resistance | Sharp, localized pain directly over the bicipital groove | High sensitivity (85%) for bicipital tenosynovitis and labral junction irritation | |
| Biceps Groove Palpation | Arm positioned in 10° internal rotation; examiner palpates directly between tuberosities | Exquisite focal tenderness as the arm is gently rotated internally and externally | Confirms localized tenosynovitis within the fibrous sheath |
Physiotherapy Management Protocols
- Restoring Scapular Kinematics and Posture: Anterior head carriage and protracted shoulders tilt the acromion forward, severely narrowing the bicipital groove outlet; train pectoralis minor stretching and lower trapezius retraction.
- Rotator Cuff Depression and Humeral Centering: Strengthen the subscapularis and infraspinatus to dynamically depress the humeral head, relieving compressive friction on the intra-articular biceps tendon.
- Biceps Tenodesis vs Tenotomy Rehabilitation: If conservative therapy fails and surgical tenodesis (anchoring the tendon outside the joint) is performed, avoid active resisted elbow flexion for 6 weeks to allow bony anchor incorporation.
Frequently Asked Questions
Why does the front of my shoulder click and pop when I reach behind me?
You may have a subluxating biceps tendon. The fibrous roof that holds your biceps tendon in its groove has torn, allowing the tendon to physically slip in and out of the bone groove with an audible snap.
What is the difference between Speed's test and Yergason's test?
Speed's test checks for inflammation (tendinitis) by pressing down on your straight, palm-up arm. Yergason's test checks for tendon dislocation (subluxation) by having you twist your wrist against resistance while the therapist feels for the tendon popping out.
What is a 'Popeye muscle' after a biceps tear?
If a chronically inflamed long head of the biceps snaps completely, the muscle belly retracts downward toward your elbow, forming a distinct bulge resembling Popeye's cartoon arm. It causes cosmetic changes but surprisingly little long-term loss of strength.
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