A Rare Case of Bilateral Supraspinatus Tendon Tears with Unilateral Musculotendinous Junction Involvement in an Elderly Patient

Rotator cuff (RC) tears are a common cause of shoulder pain in the elderly, though tears at the musculotendinous junction (MTJ) are uncommonly observed. We present a rare case of bilateral supraspinatus tendon tears in a 68-year-old male, with unilateral involvement of the MTJ. Symptoms developed three months after resuming resistance training following left acromioclavicular dislocation surgery. Ultrasound revealed a full-thickness insertional tear on the left and a partial MTJ tear on the right. Conservative treatment led to symptom resolution without surgery. This case highlights the diagnostic value of dynamic ultrasound for subtle rotator cuff and MTJ lesions in elderly patients.