Overview
The biceps muscle has two tendons at the elbow. The distal biceps tendon attaches to a bump on the radius bone just below the elbow joint. It is the main driver of turning your palm upward (supination), and it also adds real power to bending the elbow. The tendon almost always tears at its attachment to bone, not in the belly of the muscle. The classic story is resisting a sudden downward force with the elbow bent, such as catching a heavy falling object.
You will usually feel a pop, see fast bruising around the elbow, and notice the muscle bunching up toward the shoulder (the "Popeye" sign). Turning the palm up weakens more than bending does, because other muscles can partly cover for lost bending strength. Repair within a few weeks of injury works best. Wait too long, and the tendon end pulls back and scars in a shortened position. Early repair gives reliably better strength than a late one.
How the Procedure Works
We retrieve the pulled-back tendon through an incision at the front of the elbow crease. We then reach the bone through a natural gap between two forearm muscles. That route protects two nearby nerves: one near the skin that gives feeling to the forearm, and a deeper one that wraps around the upper radius close to where we work. The attachment spot is cleaned to bleeding bone, on the same face where the tendon originally attached. Placing the tendon there restores its natural leverage for turning the palm up.
We then fix the tendon to the bone. The tools are a small anchoring button passed through a tunnel in the bone, a screw that wedges the tendon inside the tunnel, or both, depending on the tissue. Repair within two to three weeks of rupture, before the tendon pulls back and scars, gives the best strength results.
When to Consider Distal Biceps Repair
We offer distal biceps repair when the symptoms, the imaging, and a trial of non-operative care all point the same way. The typical picture includes:
Acute distal biceps rupture
A sudden tear, with bruising at the front of the elbow and loss of the normal muscle shape.
Strength-dependent lifestyle
Lost strength turning the palm upward, enough to affect your work or hobbies.
Treats: Distal Biceps Rupture
Risks & Why We Still Recommend It
Every operation carries risk. This procedure is offered because the condition, when left untreated, can cause a measurable, lasting loss of palm-up and bending strength and a visible change in the shape of the arm. The decision to proceed weighs the risks of surgery against the limitations the condition places on daily function. Surgery does not remove risk; it addresses a problem that is otherwise progressive. Whether it is appropriate is determined for each patient in consultation with the surgeon.
The risks we discuss with you before distal biceps repair include:
- bleeding and infection
- anesthesia risk
- irritation of a skin nerve, causing forearm numbness that is usually short-lived
- injury to the deeper nerve that wraps around the radius (rare)
- extra bone forming between the two forearm bones
- re-tear if the arm is loaded too early
- hardware irritation
Surgery makes sense when you have a fresh distal biceps tear and palm-up strength matters for your work or activity. If that picture does not fit you, this operation is not offered.
Frequently Asked
questions we hear in clinicHow do I know my biceps tendon has torn?
The classic story is resisting a sudden downward force with the elbow bent, such as catching a heavy falling object. You will usually feel a pop, see fast bruising around the elbow, and notice the muscle bunching up toward the shoulder (the "Popeye" sign).
Why is turning my palm up weaker than bending my elbow?
The distal biceps tendon is the main driver of turning the palm upward (supination). Bending strength suffers less because other muscles can partly cover for it, which is why palm-up weakness is the more telling sign.
How soon does the tendon need to be repaired?
Repair within a few weeks of injury works best. Within two to three weeks of rupture, before the tendon end pulls back and scars in a shortened position, repair gives reliably better strength than a late one.
What happens if I skip surgery?
The tear, left alone, causes a measurable loss of palm-up and bending strength. That strength does not come back on its own, and the arm's shape visibly changes. Surgery makes sense when you have a fresh tear and palm-up strength matters for your work or activity.
How is the tendon attached back to the bone?
The attachment spot on the radius is cleaned to bleeding bone, on the same face where the tendon originally attached, which restores its natural leverage. The tendon is then fixed with a small anchoring button passed through a tunnel in the bone, a screw that wedges the tendon inside the tunnel, or both, depending on the tissue.
What are the main risks?
Bleeding and infection, anesthesia risk, irritation of a skin nerve causing forearm numbness that is usually short-lived, rare injury to the deeper nerve that wraps around the radius, extra bone forming between the two forearm bones, re-tear if the arm is loaded too early, and hardware irritation.
Further Reading
External patient-education references and related OSI pages for additional background:
