The biceps muscle has two tendons that attach it to the shoulder — the long head and the short head. A biceps tendon tear at the shoulder most commonly involves the long head tendon, which passes through the shoulder joint and is subject to significant wear over time.
Proximal biceps tendon tears rarely occur in isolation — they are frequently associated with rotator cuff tears and subacromial impingement syndrome. MRI is essential for evaluating all of these structures together, since the treatment decision for the biceps tendon is often made in the context of concurrent rotator cuff pathology. Distal biceps tendon tears at the elbow are a distinct injury covered in our elbow biceps tendinopathy page.
Causes
Degenerative rupture
The majority of proximal biceps tendon tears occur in middle-aged and older adults as a result of gradual tendon degeneration. Years of wear within the bicipital groove and through the shoulder joint weaken the tendon until it eventually ruptures, often with minimal provocation. Chronic subacromial impingement and concurrent rotator cuff disease are frequently present.
Acute rupture
A sudden tear can occur during heavy lifting, a fall, or a forceful overhead movement. This type is more common in younger, active patients and is often associated with concurrent rotator cuff pathology or shoulder instability.
Symptoms
A sudden sharp pain in the front of the shoulder is often the first sign. Patients may hear or feel a pop at the time of rupture. The classic physical finding is a "Popeye deformity" — a bulge in the lower arm caused by the retracted, contracted biceps muscle belly. Bruising and swelling in the upper arm are also common. Some patients notice weakness with forearm supination (turning the palm upward) and elbow flexion, though strength loss is often less dramatic than expected due to the short head tendon remaining intact.
Diagnosis
Physical examination typically reveals the characteristic muscle deformity and localized tenderness over the bicipital groove. The Speed test and Yergason test assess biceps tendon integrity. A dedicated shoulder MRI is the preferred imaging modality — it enables precise visualization of the tendon, confirms the tear location and degree, assesses for tendon retraction, and evaluates the rotator cuff and surrounding structures for associated injuries that may alter the surgical plan.
Tear classification
- Partial tear: Tendon is frayed or partially disrupted but maintains continuity. Often managed conservatively.
- Complete tear (proximal): Full rupture of the long head tendon at or near the shoulder. The most common type in older adults — produces the classic Popeye deformity.
- Complete tear (distal): Full rupture of the biceps tendon at the elbow. Less common but typically requires surgical repair due to significant functional loss of supination strength.
Treatments
Treatment depends on the location of the tear, severity of symptoms, patient age, and activity level.
After the initial injury, rest, ice, a sling for comfort, and anti-inflammatory medications are recommended.
Partial tears: Physical therapy to strengthen the surrounding shoulder musculature, activity modification, and anti-inflammatory medications often provide good results without surgery.
Complete proximal tear in young and active patients
Surgery is often advised for young or active patients who want to restore full strength and appearance. Biceps tenodesis repositions and reattaches the tendon to the humerus, restoring both function and cosmetic appearance. This is frequently performed at the same time as rotator cuff repair when concurrent pathology is present. After surgery, a thorough physical therapy program is critical to healing and recovering function.
Complete proximal tear in older or lower-demand patients
Older patients who do not require full biceps strength for sports or heavy lifting may be advised to avoid surgery. While the Popeye deformity persists, most patients regain acceptable functional strength with physical therapy and experience good pain relief once the degenerated tendon has ruptured.
Complete distal tear
Distal biceps tears almost always require prompt surgical reattachment to prevent permanent loss of elbow supination and flexion strength, regardless of patient age or activity level. Early repair — ideally within 2–3 weeks of injury — produces the best outcomes.
Get an MRI to Confirm Your Diagnosis
Before surgical planning or starting treatment, a clear MRI diagnosis ensures the right path forward. First Look MRI offers self-pay Shoulder MRI scans — no doctor's order or insurance required — at our locations in Georgia, Texas, and Colorado.