A sudden sharp pain in the elbow, a popping sensation, a visible bulge moving up the upper arm, and dramatic weakness when trying to bend the elbow or turn the palm upward are the defining features of a distal biceps rupture. Unlike most elbow injuries, this one often requires prompt surgical attention to restore full arm strength.
What is Distal Biceps Rupture?
The distal biceps tendon attaches the biceps muscle to the radial tuberosity of the forearm at the elbow. It is the primary driver of forearm supination, the motion of turning the palm upward, and also contributes significantly to elbow flexion strength. When this tendon ruptures at its attachment on the radial tuberosity, the biceps muscle retracts toward the shoulder, causing the characteristic bulge in the upper arm.
Unlike proximal biceps ruptures, which have a relatively minor functional impact, distal biceps ruptures cause a significant and permanent loss of supination strength, up to 40 to 50 percent, and elbow flexion strength of approximately 30 percent if left unrepaired. Surgical repair is the recommended treatment for most active patients.
Types of Distal Biceps Rupture
Causes
The injury is almost universally caused by an unexpected eccentric load through the elbow, where the elbow is forced into extension while the biceps is actively contracting. Weightlifting, carrying heavy loads, and sudden resistance during manual work are common mechanisms. It predominantly affects men between 30 and 50.
- A sudden pop or tearing sensation at the elbow with immediate pain
- Visible proximal migration of the biceps muscle belly, the Popeye deformity, though less prominent than with proximal ruptures
- A palpable gap in the antecubital fossa where the tendon normally sits
- Weakness and fatigue with forearm supination, particularly turning a screwdriver or unscrewing a jar
- Weakness with resisted elbow flexion
Diagnosis
Clinical examination, including the hook test, is highly reliable for confirming a distal biceps rupture. The examiner attempts to hook a finger under the tendon in the antecubital fossa; an absent tendon is diagnostic. MRI or ultrasound confirms the diagnosis, identifies the degree of retraction, and guides surgical planning.
Treatment
Distal Biceps Repair
Dr. Kushalappa performs surgical repair of the distal biceps tendon through a single incision approach in the antecubital fossa. The ruptured tendon is retrieved, prepared, and reattached to the radial tuberosity using bone anchors or bone tunnels. Early surgical repair, within 2 to 4 weeks of injury, is strongly recommended as delayed surgery requires more extensive tissue dissection and has a higher complication rate. Recovery involves a splint or sling for 2 weeks, followed by progressive physiotherapy. Most patients return to full supination strength at 3 to 4 months and to demanding physical activity at 4 to 6 months.
Why Choose Dr. Kushalappa Subbiah in Bangalore?
Dr. Kushalappa Subbiah completed a Fellowship in Shoulder Surgery at the Sydney Shoulder Research Institute, where he trained in advanced arthroscopic shoulder procedures including labral repair and reconstruction. He holds the International Olympic Committee (IOC) Diploma in Sports Medicine, and has direct clinical experience managing shoulder injuries in Indian athletes across cricket, swimming, tennis, and contact sports. He is appointed as a Consultant Shoulder Surgeon at NH Hospital, Bangalore.