Proximal Biceps Ruptures

Proximal biceps tendon rupture predominantly involves the long head of the biceps (LHB). It is frequently a degenerative process associated with chronic shoulder impingement and rotator cuff disease.

Pathophysiology:

• The LHB tendon intra-articular portion is vascularly compromised and subject to shear forces.
• Usually occurs at the proximal bicipital groove entrance or near the supraglenoid tubercle.
• "Autotenotomy": Spontaneous rupture often relieves the deep anterior shoulder pain of chronic biceps tendinitis.

The long head of biceps (LHB) tendon fails through a predictable degenerative cascade rather than a single traumatic event in most patients.

• Mechanical environment: The intra-articular LHB makes a near 90-degree turn at the rotator interval to enter the bicipital groove. This turn is a chronic shear and friction point ("pulley" zone).
• Vascular factors: The proximal intra-articular segment lies in a relative hypovascular watershed zone, limiting healing and predisposing to attritional degeneration.
• Degenerative sequence: Tenosynovitis (tendinitis) progresses to tendinosis with collagen disorganisation, then partial and finally complete rupture - typically near the supraglenoid tubercle or groove entrance.
• Impingement linkage: Subacromial impingement and rotator cuff disease accelerate LHB degeneration, which is why proximal rupture is a sentinel sign of cuff pathology over the age of 40.
• Instability mechanism: Because the transverse humeral ligament is reinforced by subscapularis fibres, a subscapularis tear allows the LHB to sublux/dislocate medially before it ruptures.
• "Autotenotomy": Once the tendon ruptures, the inflamed intra-articular pain generator is unloaded, which is why chronic anterior shoulder pain often improves after the rupture event.

The pathophysiology and classification refer to the "pulley lesion" and to medial subluxation with subscapularis tears — here is the pulley anatomy and the instability it governs.

• The reflection pulley. At the rotator interval the LHB is held at its turn into the groove by a fibrous sling — the biceps reflection pulley — formed by the superior glenohumeral ligament (SGHL) and coracohumeral ligament (CHL), reinforced anteriorly by fibres of subscapularis and posteriorly by supraspinatus.
• Why instability is (almost always) medial. Because the anterior wall of the pulley and groove is reinforced by the subscapularis, a subscapularis (with SGHL) tear lets the LHB sublux or dislocate medially — riding over or under the torn subscapularis — often before the tendon frankly ruptures. Medial biceps dislocation is therefore a strong indirect sign of a subscapularis tear.
• Classifying the lesion. Pulley lesions are commonly graded by the Habermeyer classification (types I-IV) according to which structures are involved (isolated SGHL, SGHL plus the supraspinatus side, SGHL plus the subscapularis side, or both), which predicts the pattern of biceps instability.
• Management. Address the unstable biceps (tenodesis or tenotomy) AND repair the subscapularis / anterior pulley — leaving the pulley or subscapularis lesion untreated allows persistent pain and re-subluxation. Detailed subscapularis repair is developed in the subscapularis-tears topic.

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Special Tests (Pre-rupture / Contralateral): Tests are often negative AFTER complete rupture.

1. Speed's Test: Pain with forward flexion against resistance (elbow extended, supinated).
2. Yergason's Test: Pain with supination against resistance (elbow 90 deg). Specific for groove pathology.
3. Ludington's Test: Hands on head, flex biceps. Palpate for absence of tendon (specific for rupture).

The "Popeye" arm and acute anterior shoulder pain have a short but exam-relevant differential. The single most important distinction is proximal vs distal biceps rupture, because their management algorithms are opposite.

The tenotomy technique warns about an "hourglass" biceps and the evidence base includes it — the entity deserves developing, because it changes the operation.

• What it is. A hypertrophic intra-articular segment of the long head of biceps that becomes too bulky to slide down into the bicipital groove when the arm is elevated. On elevation the tendon buckles and is squeezed (incarcerated) between the humeral head and glenoid — an intra-articular mechanical block, likened by Boileau to a bucket-handle meniscal tear locking the knee.
• How it presents. Anterior shoulder pain with a 10-20 degree loss of active AND passive elevation (a true mechanical block, not just weakness), usually with coexisting rotator cuff disease.
• How it is confirmed. The intraoperative "hourglass test" — forward elevation with the elbow extended reproduces the buckling and incarceration of the tendon within the joint.
• Why it changes management. Simple tenotomy at the origin does NOT relieve the block — the hypertrophic intra-articular portion is still incarcerated. The bulky intra-articular segment must be excised (a "bipolar" tenotomy) or removed as part of a tenodesis. Recognising it converts an unexplained stiff, painful shoulder into a treatable mechanical lesion.

Note for Tenotomy: Immediate active ROM is allowed as tolerated. No specific restrictions other than pain.

Evidence summary (consolidated from Level I RCTs and meta-analyses):

• Functional scores equivalent — ASES, WORC and Constant-Murley scores do not differ between tenotomy and tenodesis in pooled Level I data.
• Popeye deformity is the one reproducible difference — roughly 23-33% after tenotomy vs 7-10% after tenodesis.
• Strength — most RCTs show no difference in elbow flexion or supination strength; only isolated trials show marginally higher supination strength after tenodesis (clinical relevance debated).
• Cramping — historically attributed to tenotomy, but high-level RCTs found cramping rates similar between groups.
• Trade-offs — tenotomy is faster with simpler rehab; tenodesis better preserves cosmesis at the cost of operative time, implant cost and the specific risks below.

Global epidemiology

• Long head of biceps (LHB) pathology is found in a high proportion of rotator cuff tears at surgery; isolated LHB rupture in patients over 40 is widely regarded as a sentinel sign of cuff disease.
• Peak incidence is the 5th-6th decade, predominantly in men and manual or overhead workers.
• Distal ruptures are far rarer than proximal and occur in younger, often muscular men with sudden eccentric load.

Side-by-side guidance

Practice variation by resource setting

• High-resource settings: ready MRI access, arthroscopic suprapectoral or open subpectoral tenodesis with implants, formal physiotherapy pathways.
• Limited-resource settings: ultrasound or clinical diagnosis predominate; non-operative management and, when surgery is indicated, arthroscopic tenotomy (no implant cost, immediate rehab) are favoured. The functional equivalence shown in RCTs makes tenotomy a defensible, cost-effective default where implants are scarce.