What happens to the tendon
The long head of the biceps tendon is one of the two tendons attaching the biceps muscle to the shoulder and it is the one most commonly torn. It runs in a narrow bony groove and is constantly loaded during lifting and overhead activity so over time it may develop tendinopathy and small degenerative changes. A sudden strong contraction or forceful movement can then cause a complete rupture leading to an initial sharp pain followed by bruising in the upper arm and a characteristic bulging of the biceps muscle.
Patients usually report pain at the front of the shoulder, weakness with elbow flexion or forearm rotation and a change in the shape of the upper arm. Diagnosis is based on history, physical examination and imaging when needed. Management is often conservative with gradual return to activity and a physiotherapy programme focusing on pain control, restoring range of motion and strengthening the shoulder and elbow muscles, while in selected individuals with higher demands surgical procedures such as tenodesis may be considered.