Distal Biceps Tendon Tear
What Is a Distal Biceps Tendon Tear?
The biceps muscle has tendons at both ends — one set at the shoulder (discussed on our Labral Tear and Biceps Tendonitis pages) and a single tendon at the elbow, known as the distal biceps tendon, which anchors the muscle to the radius bone of the forearm. This tendon allows the biceps to power two key motions: bending the elbow and rotating the forearm to turn the palm upward (supination). A distal biceps tear occurs when this tendon pulls away from its attachment at the elbow, almost always affecting the entire tendon at once, unlike many other tendon injuries that begin as a partial tear.
What Causes a Distal Biceps Tendon Tear?
- A sudden, forceful straightening of the elbow while the biceps muscle is actively contracting — the classic mechanism, such as trying to catch a heavy falling object or losing a grip while lifting weight
- Most commonly occurs in middle-aged men, particularly those who weightlift or perform heavy manual labor
- Anabolic steroid use, which has been associated with a higher risk of this injury in some studies
- Tobacco use, which may weaken tendon quality over time
What Are the Symptoms of a Distal Biceps Tendon Tear?
- A sudden, sharp pain at the front of the elbow, often described as a tearing or popping sensation
- Rapid bruising and swelling in the front of the elbow and forearm
- Visible deformity, with the biceps muscle appearing to bunch up higher on the upper arm (sometimes called a “reverse Popeye” deformity, since the muscle retracts toward the shoulder rather than staying anchored at the elbow)
- Noticeable weakness bending the elbow and, in particular, rotating the palm upward
- A palpable gap or defect felt at the front of the elbow crease
Why Does Forearm Rotation Weakness Matter?
While elbow bending strength is often only modestly affected after a distal biceps tear, since several other muscles help bend the elbow, forearm rotation strength — turning the palm upward — is much more significantly affected, since the biceps is the primary muscle responsible for this motion. This distinctive pattern of weakness, more pronounced with rotation than with bending, is one of the clues that helps point toward a distal biceps tear during a physical exam, and is often specifically what limits patients from tasks like turning a screwdriver or a doorknob.
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Treatment Options for a Distal Biceps Tendon Tear
Nonsurgical treatment may be considered for lower-demand patients willing to accept some permanent weakness, particularly with forearm rotation, in exchange for avoiding surgery.
Surgical repair is generally recommended for most active patients, since the distal biceps tendon has very limited ability to heal back to the bone on its own once fully torn. Repair involves reattaching the tendon to its normal attachment site on the radius bone, typically using suture anchors or a small button-style fixation device, and is ideally performed within the first few weeks after injury — a torn distal biceps tendon tends to retract and scar in place relatively quickly, making the repair more technically challenging, and sometimes requiring a tendon graft to bridge the gap, the longer surgery is delayed.
Recovery involves an initial period of bracing to protect the repair, followed by a gradually staged return of motion and strength over several months, with full recovery of strength often taking closer to a year.
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