Biceps Tendon Injury
What Is a Biceps Tendon Injury?
The biceps brachii lies along the front of the upper arm and crosses two joints. At the shoulder it has two tendons: the long head, which passes over the top of the ball-and-socket joint and then runs down a bony groove at the front of the humerus, and the short head, which attaches to the coracoid process of the shoulder blade. At the elbow a single distal tendon inserts on the radial tuberosity and provides most of the power for turning the palm upward.
A biceps tendon injury is a spectrum rather than one diagnosis. Tendon fibres may be frayed or partially torn, the long head may slip out of its groove when the pulley that holds it in place fails, or a tendon may rupture completely and pull away from its attachment. Where the injury sits, whether the tear is partial or complete, and the condition of the surrounding tissue together determine which treatments are reasonable.
Proximal and Distal Injuries: Why the Difference Matters
Most complete biceps ruptures at the shoulder involve the long head, usually in a tendon that was already degenerate, and they are seen more often in older adults and in shoulders with existing rotator cuff disease. Because the short head stays attached to the coracoid, elbow bending and forearm rotation remain largely functional. Many of these injuries are managed without surgery once the other structures described in the shoulder section have been assessed.
A distal rupture at the elbow behaves very differently. That tendon is the main supinator of the forearm, and when it detaches there is no second attachment to compensate, so strength for turning the palm upward falls noticeably and elbow flexion power is also reduced. A suspected acute distal rupture should be assessed promptly by a specialist, because the tendon retracts and scars over time and direct repair becomes progressively more difficult.
What Causes a Biceps Tendon Tear?
Biceps tendon injuries usually result from a combination of accumulated tendon wear and a single overloading event. The classic mechanism at the elbow is an unexpected straightening force applied while the elbow is bent and working hard, such as catching a falling weight or lifting an object that suddenly shifts.
- Repetitive overhead work, throwing, swimming or heavy lifting that gradually wears the long head tendon.
- Age-related degeneration, which reduces the ability of the tendon to tolerate a sudden load.
- Existing shoulder problems such as rotator cuff tearing, impingement or damage to the pulley that stabilises the long head tendon in its groove.
- A sudden eccentric load on a flexed elbow, the typical mechanism of a distal rupture.
- Heavy manual work, weight training with rapid increases in load, and contact or collision sports.
- Smoking, which is associated with impaired tendon healing and a higher risk of distal biceps rupture.
- Non-medical anabolic steroid use, which has been linked with tendon rupture.
- Previous corticosteroid injection placed into or immediately around a tendon.
Distal ruptures occur most often in men between roughly 40 and 60 years of age and usually affect the dominant arm. Proximal long head ruptures become more frequent with increasing age and often follow a long period of front-of-shoulder pain.
Symptoms of a Torn Biceps Tendon
A complete rupture is often felt as a sudden pop or snap during effort, followed by sharp pain that settles into an ache over the following days. Partial tears are far less dramatic and may show only as activity-related pain and weakness.
- Sudden sharp pain at the front of the shoulder or in the crease of the elbow at the moment of injury.
- Bruising that spreads down the arm or towards the forearm during the first few days.
- Cramping or aching in the biceps muscle after sustained use.
- A change in the contour of the arm: the muscle belly bunches lower after a long head rupture and higher after a distal rupture.
- Weakness when turning the palm upward, which is more pronounced after a distal rupture.
- A palpable gap in the front of the elbow where the distal tendon should be felt.
The visible bulge often called a Popeye deformity is a helpful clue, but it is not present in every case and it does not measure how serious the injury is. Early swelling can hide it, and a partial tear may produce no change in shape at all. The pattern of weakness is more informative than the appearance of the arm.
What Else Can Cause Similar Symptoms?
Pain at the front of the shoulder without a rupture is more often caused by irritation and degeneration of the long head tendon, which is covered on the biceps tendinitis page. Subacromial pain and shoulder impingement, rotator cuff tearing, superior labral (SLAP) injury and glenohumeral arthritis can all reproduce similar complaints, and more than one of them may be present at the same time.
At the elbow the alternatives include a partial distal tear, inflammation of the bursa that sits beneath the tendon insertion, avulsion of a small bone fragment and pain referred from the neck. Numbness or tingling in the hand points towards a nerve problem rather than a tendon rupture and needs separate assessment.
How Is a Biceps Tendon Injury Diagnosed?
The history often makes the diagnosis clear: what the arm was doing at the moment of injury, whether a pop was heard or felt, how quickly bruising appeared, and which tasks have since become difficult.
Examination compares both arms for contour, tenderness, a palpable defect and strength in elbow flexion and supination. At the elbow the hook test, in which the examiner attempts to hook a finger under the distal tendon with the elbow bent and the forearm turned upward, is a simple and dependable way to detect a complete distal rupture. Shoulder assessment also covers the rotator cuff, the labrum and shoulder-blade control, because associated problems are common.
X-rays do not show the tendon itself, but they can identify an avulsed bone fragment, arthritis or another bony cause of pain. Ultrasound allows the tendon to be examined dynamically and is useful in experienced hands. MRI defines the level of the tear, the degree of retraction and the state of the surrounding structures; for the distal tendon a dedicated flexed, abducted and supinated position improves the view of the insertion.
Non-Surgical Treatment Options
Non-surgical care is a reasonable first choice for partial tears, for proximal long head ruptures in patients whose demands and expectations allow it, and for people whose general health makes an operation inadvisable.
- Relative rest with modification of the movements that clearly provoke pain, rather than complete immobilisation of the arm.
- Cold application and simple pain relief in the early phase, with anti-inflammatory medication chosen according to the patient's other medical conditions.
- A sling for comfort during the first days when pain is significant.
- A structured physiotherapy programme that restores range of motion before strength is loaded.
- Graded reintroduction of heavy lifting and forceful supination at work and in training.
Patients who accept a change in arm contour and a modest loss of supination strength are frequently satisfied after a proximal long head rupture treated this way. Persistent cramping, pain in the bicipital groove or weakness that limits work are the usual reasons to revisit the decision.
When Is Surgery Needed?
At the shoulder, surgery for a long head problem is selective. Tenotomy releases the tendon from its upper attachment, while tenodesis releases it and fixes it to the humerus lower down; the biceps tenodesis page explains that procedure and how the two options differ. Either is often performed at the same time as treatment for an associated rotator cuff or labral problem, frequently through shoulder arthroscopy.
An acute complete distal rupture in an active patient is usually repaired, because supination strength and endurance are hard to regain otherwise. The tendon is reattached to the radial tuberosity through a single anterior incision or a two-incision approach, using a cortical button, an interference screw, suture anchors or bone tunnels. A rupture left untreated for a long time may have retracted and scarred, in which case reconstruction with a graft may be needed instead of direct repair.
Risks that are specific to distal biceps surgery include numbness over the outer forearm from irritation of the lateral antebrachial cutaneous nerve, injury to the posterior interosseous nerve, heterotopic bone formation between the radius and the ulna, stiffness, re-rupture and infection. These are weighed against the expected functional gain before any decision is made.
Rehabilitation After a Biceps Tendon Injury
Rehabilitation is planned around what was injured and what was done about it, and it advances on criteria rather than on dates. After a repair the early limits are set by the surgeon to protect the fixation.
- Protection phase: pain and swelling are controlled and the arm is supported within the limits agreed after surgery.
- Motion phase: passive and then active-assisted movement restores range without stressing a healing tendon.
- Early strengthening: isometric and light resisted work for elbow flexion, supination, the rotator cuff and the shoulder-blade muscles.
- Progressive loading: resistance is increased as movement, control and tolerance allow.
- Task-specific training: lifting technique, overhead work, throwing and job-specific demands are rebuilt gradually.
- Return to full activity once strength approaches the other side and a full day of loading no longer causes a flare the next day.
Recovery and What to Expect
After a proximal long head rupture treated without surgery, pain often improves within a few weeks. Cramping with sustained use may take longer to settle, and the change in the contour of the arm is permanent.
After a distal repair the arm is protected for a period, motion is restored first, and resistance work is added in stages. Heavy lifting and forceful supination are generally deferred for several months, and strength and endurance continue to improve well beyond that point. The exact schedule depends on the fixation used, the quality of the tissue and the demands of the patient's work or sport.
Progress is judged on movement, strength compared with the other arm and the ability to complete real tasks without a next-day flare, not on a fixed calendar. Age, smoking, diabetes and how long the tendon was left retracted all influence the final result.
Prevention and Reducing the Risk of Re-injury
A degenerate tendon cannot be made new again, but the load it has to absorb can be managed deliberately.
- Increase training volume and weights in small steps rather than large jumps.
- Warm up before heavy lifting and avoid maximal effort when fatigued.
- Keep the rotator cuff, shoulder-blade and forearm muscles conditioned throughout the year.
- Use both hands and keep the load close to the body when lifting awkward or unstable objects.
- Have persistent front-of-shoulder pain assessed early instead of working through it.
- Avoid smoking and non-medical anabolic steroid use, both of which are associated with tendon rupture.
When Should You See a Doctor?
Any sudden pop in the arm followed by bruising, a change in the shape of the muscle or a clear loss of strength should be assessed rather than watched. This matters most when the symptoms centre on the elbow, because the window in which a straightforward repair is possible is limited.
- A pop or tearing sensation during lifting, followed by bruising.
- A palpable gap at the front of the elbow or a new change in the shape of the arm.
- Weakness turning the palm upward or bending the elbow against resistance.
- Front-of-shoulder pain that persists for weeks despite rest and simple measures.
- Numbness, tingling, a cold or discoloured hand, or progressive weakness after an injury.
- Fever, spreading redness, drainage or rapidly increasing pain after an injection or an operation.
To have an arm or shoulder injury assessed you can contact Assoc. Prof. Serkan Sürücü, and you may also want to review the other conditions covered under elbow surgery.