The interosseous cubital bursa is an inconstant bursa in the cubital fossa, lying between the distal biceps tendon and the ulna. It sits on the ulnar side of the bicipitoradial bursa and may communicate with it.
| Location | In the cubital fossa between the distal biceps tendon and the ulna, on the ulnar side of the bicipitoradial bursa |
|---|---|
| Nearby |
|
Reduces friction between the distal biceps tendon and the ulna and nearby structures during pronation and supination
When distended, it can present as a mass in the cubital fossa and occasionally contributes to compression of nearby nerves, including the deep (posterior interosseous) branch of the radial nerve. It is assessed with the bicipitoradial bursa in patients with anterior elbow swelling or distal biceps tendinopathy.
Inflammation and distension of the bursae around the distal biceps tendon causing anterior elbow pain and swelling, worse with resisted supination and elbow flexion.
Rarely, an enlarged bursa in the cubital fossa compresses a nearby nerve, producing weakness or sensory change in its territory.
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