Overview
The distal biceps attaches to the radial tuberosity and is the primary supinator of the forearm as well as a powerful elbow flexor. Rupture — typically from a sudden eccentric load — produces weakness of supination more than flexion, retraction of the muscle, and a characteristic 'Popeye' deformity. Early repair prevents the tendon from scarring in a retracted position.
How the Procedure Works
We retrieve the retracted tendon through an anterior incision at the elbow crease, then expose the radial tuberosity through the interval between the brachioradialis and the pronator teres — this protects both the lateral antebrachial cutaneous nerve superficially and the posterior interosseous nerve, which wraps around the radial neck just centimeters from where we're working. The tuberosity is prepared to bleeding bone on its ulnar (deep) face, which is the anatomic footprint; placing the tendon here restores the supination moment arm more faithfully than a more anterior position. We secure the tendon with a cortical button passed through a unicortical tunnel, an interference screw, or both depending on tissue quality and tunnel geometry. Repair within two to three weeks of rupture, before significant retraction and scarring, gives the best strength outcomes.
When to Consider Distal Biceps Repair
Distal biceps repair is generally offered when symptoms, imaging, and a trial of non-operative care together point to surgery as the next step. The typical picture includes:
Acute distal biceps rupture
A sudden tear, with bruising in the antecubital fossa and loss of the normal distal biceps contour.
Strength-dependent lifestyle
Loss of supination strength that meaningfully affects the patient's work or recreational activity.
Conditions This Treats
Physicians Who Perform Distal Biceps Repair
Providers Who Surgically Assist with Distal Biceps Repair
Risks & Why We Still Recommend It
Every operation carries risk. The reason we offer this procedure is that the condition, left untreated, causes a measurable loss of supination and flexion strength that doesn't come back on its own and an obvious contour change in the arm. That is the trade we are managing — not eliminating risk, but choosing the smaller of two unfavorable trajectories.
The risks we discuss with patients before distal biceps repair include:
- bleeding and infection
- anesthesia risk
- lateral antebrachial cutaneous nerve irritation causing forearm numbness, usually transient
- posterior interosseous nerve injury (rare, from the anterior exposure)
- heterotopic ossification between the radius and ulna
- re-rupture if loaded too early
- hardware irritation
The indication to proceed is an acute distal biceps rupture in a patient who needs supination strength. Patients who don't need this operation don't get it.
Further Reading
External patient-education references and related OSI pages for additional background: