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Bones & Joints
Proximal biceps tendon rupture is a complete tear of the long head of the biceps tendon at the shoulder, causing sudden anterior shoulder pain (often described as a 'pop'), immediate weakness, and a characteristic distal bulge of the biceps muscle in the upper arm known as the 'Popeye deformity' or 'Popeye sign' from the muscle retracting distally when the proximal anchor is lost. The long head of biceps (LHB) tendon originates from the superior labrum inside the shoulder joint, travels through the bicipital groove of the humerus, and joins the short head to form the biceps muscle belly—when the LHB ruptures proximally (95% of biceps ruptures, vs 5% distal biceps), the muscle retracts down the arm creating the visible bulge. Risk factors include age over 40 years, chronic biceps tendinopathy, rotator cuff tears (50-60% association), corticosteroid injections, smoking, and overhead activities. Despite dramatic appearance, functional loss is surprisingly mild (10-20% loss of supination strength, 5-10% loss of elbow flexion strength) because the short head of biceps remains intact and compensates. Treatment options include conservative management (acceptable for sedentary individuals and elderly patients—90% satisfactory outcomes despite cosmetic deformity), biceps tenotomy (simple release allowing further retraction—quick recovery but persistent cosmetic deformity and 10-20% risk of muscle cramping), or biceps tenodesis (reattaching tendon to humerus restoring length-tension relationship—best cosmetic and functional outcomes 85-95% but longer recovery 4-6 months and higher complication rate 10-15%).
What it is and why it happens
Proximal biceps tendon rupture is a complete tear of the long head of the biceps tendon at the shoulder, causing sudden anterior shoulder pain (often described as a 'pop'), immediate weakness, and a characteristic distal bulge of the biceps muscle in the upper arm known as the 'Popeye deformity' or 'Popeye sign' from the muscle retracting distally when the proximal anchor is lost. The long head of biceps (LHB) tendon originates from the superior labrum inside the shoulder joint, travels through the bicipital groove of the humerus, and joins the short head to form the biceps muscle belly—when the LHB ruptures proximally (95% of biceps ruptures, vs 5% distal biceps), the muscle retracts down the arm creating the visible bulge. Risk factors include age over 40 years, chronic biceps tendinopathy, rotator cuff tears (50-60% association), corticosteroid injections, smoking, and overhead activities. Despite dramatic appearance, functional loss is surprisingly mild (10-20% loss of supination strength, 5-10% loss of elbow flexion strength) because the short head of biceps remains intact and compensates. Treatment options include conservative management (acceptable for sedentary individuals and elderly patients—90% satisfactory outcomes despite cosmetic deformity), biceps tenotomy (simple release allowing further retraction—quick recovery but persistent cosmetic deformity and 10-20% risk of muscle cramping), or biceps tenodesis (reattaching tendon to humerus restoring length-tension relationship—best cosmetic and functional outcomes 85-95% but longer recovery 4-6 months and higher complication rate 10-15%).