Biceps Tendinopathy: Long Head Pain at the Front of the Shoulder

Anatomy of the Long Head of Biceps

The biceps brachii has two proximal tendon origins. The short head arises from the coracoid process and is relatively protected from impingement by its extra-articular position. The long head originates from the supraglenoid tubercle and the superior glenoid labrum, passing intra-articularly through the glenohumeral joint before exiting the joint and entering the bicipital groove on the anterior humerus — a narrow bony channel formed by the greater and lesser tuberosities, held in place by the transverse humeral ligament and the subscapularis tendon medially. This anatomical course makes the long head of biceps tendon (LHB) uniquely vulnerable: it is subject to mechanical compression and friction within the bicipital groove, compression from adjacent rotator cuff pathology within the joint, and destabilisation when the groove's restraining structures are disrupted by subscapularis tears or transverse ligament damage. Long head biceps tendinopathy — and its more dramatic counterpart, LHB subluxation and rupture — are therefore frequently associated with rotator cuff pathology and must be assessed in that context.

Clinical Presentation and Differentiation

Long head biceps tendinopathy presents as anterior shoulder pain localised to the bicipital groove — the vertical groove palpable on the anterior humerus with the arm in approximately 10 degrees of internal rotation. The pain is reproduced by Speed's test (resisted forward flexion of the shoulder with elbow extended and forearm supinated) and Yergason's test (resisted supination of the forearm with the elbow at 90 degrees). Importantly, bicipital groove tenderness alone has poor specificity — differentiating LHB pathology from subscapularis tear, anterior capsular pathology, and subacromial pain requires a cluster of clinical tests and, when diagnosis remains uncertain, ultrasound or MRI. LHB rupture — the "Popeye deformity" — presents dramatically as sudden onset of anterior shoulder pain followed by bunching of the biceps muscle belly distally (the distal stump retracting), often with an audible pop. Despite the alarming appearance, isolated LHB rupture in older patients typically requires no surgical intervention — supination and elbow flexion strength are minimally affected due to the short head's contribution.

Treatment

Conservative management of LHB tendinopathy follows the principles applicable to all tendinopathies: reduce provocative loading acutely, then progressively reload the structure. Activity modification — temporarily reducing repetitive overhead, supination, and forward flexion loading — allows tendon reactivity to settle. Ultrasound-guided corticosteroid injection into the bicipital groove sheath provides effective short-term pain relief when the tendon is significantly reactive. Progressive strengthening — supination and elbow flexion loading under progressive resistance, combined with shoulder rehabilitation addressing the co-existing rotator cuff and scapular deficits — is the rehabilitative foundation. For persistent, painful LHB tendinopathy that fails conservative management, biceps tenodesis (surgical re-anchoring of the LHB tendon to the humerus, removing it from the glenohumeral joint) or tenotomy (simply releasing the tendon) are effective surgical options with reliable outcomes.