The subscapularis is the largest and strongest of the four rotator cuff muscles, and its tendon is one of the most commonly overlooked sources of shoulder dysfunction. Subscapularis tears are often missed on standard physical examination and routine MRI, and the injury is frequently recognized only when a patient fails to improve after treatment aimed at the supraspinatus. Dr. Chudik evaluates specifically for subscapularis involvement in every rotator cuff examination because its treatment and recovery are distinct.
What Is a Subscapularis Rotator Cuff Tear?
The subscapularis muscle sits on the front of the scapula, between the shoulder blade and the rib cage. Its tendon passes in front of the humeral head and inserts on the lesser tuberosity of the humerus. The subscapularis internally rotates the arm and stabilizes the humeral head against anterior migration. It generates more force than any other rotator cuff muscle, and its loss produces significant functional weakness.
Subscapularis tears occur in several patterns:
- Partial-thickness tears at the upper border of the tendon, often associated with biceps tendon instability
- Full-thickness tears of the upper third, common in overhead athletes and in patients with chronic impingement
- Complete tears from the lesser tuberosity, usually from trauma or as part of a massive anterior cuff injury
- Chronic attritional tears with retraction, associated with failure of the long head of the biceps into the joint
Causes and Risk Factors
- Forceful external rotation or abduction injury, particularly with the arm in elevation
- Anterior shoulder dislocation, which can damage the subscapularis tendon
- Chronic repetitive overhead loading
- Age-related degenerative tearing, common over 50
- Prior shoulder surgery that involved taking down and repairing the subscapularis
Symptoms
- Weakness with internal rotation, particularly pushing off from a chair or reaching behind the back
- Difficulty tucking in a shirt or reaching a wallet in a back pocket
- Pain at the front of the shoulder, sometimes referred into the biceps area
- Increased passive external rotation compared to the opposite side (loss of the subscapularis check-rein)
- Associated biceps tendon pain or instability
Diagnosis
Dr. Chudik’s evaluation includes specific subscapularis testing that is often omitted in general shoulder examinations. Key tests include the lift-off test (the patient places the hand behind the back and lifts it off), the belly-press test (the patient presses the palm into the abdomen with the elbow forward), and the bear hug test (resisted internal rotation with the palm on the opposite shoulder). MRI is the imaging study of choice, but subscapularis tears are often subtle and require careful review in the axial plane. Arthroscopy remains the most accurate way to confirm the diagnosis and tear pattern. The Westmont office has on-site high-field MRI.
Treatment
Non-surgical treatment is reasonable for partial-thickness tears and for full-thickness tears in older, lower-demand patients. It includes a targeted physical therapy program for internal rotation strengthening, biceps tendon pain control, and activity modification.
Surgical repair is recommended for full-thickness tears in active patients and for failed non-surgical trials. Dr. Chudik performs arthroscopic subscapularis repair, reattaching the torn tendon to the lesser tuberosity with suture anchors. When the biceps tendon is subluxated or diseased, tenodesis is commonly performed at the same procedure. For chronic retracted tears where the muscle has undergone fatty atrophy, pectoralis major tendon transfer is considered as an alternative to repair.
Recovery and Outcomes
Recovery after arthroscopic subscapularis repair typically includes six weeks of sling protection with the arm in internal rotation, passive motion during that period with external rotation limited, active motion beginning at six weeks, and strengthening at three months. Return to overhead work or sport is typically five to six months.
Outcomes depend on tear chronicity, the extent of muscle atrophy, and whether the biceps was addressed at the same procedure. Acute tears in healthy tissue have better outcomes than chronic retracted tears with significant atrophy.
When to See Dr. Chudik
Schedule an evaluation if you have difficulty reaching behind your back, weakness pushing off, or front-of-shoulder pain that has not responded to prior treatment. Call 630-324-0402 or request an appointment online.