The distal biceps subtendinous bursa lies between the distal biceps tendon and the radial tuberosity, distinct from the bicipitoradial bursa which is more proximal. It cushions the tendon against the tuberosity during supination, when the tendon wraps tightly around the radius.
Distal biceps bursitis presents as antecubital fossa pain and swelling exacerbated by resisted supination and forearm pronation. MRI and ultrasound differentiate bursitis from partial distal biceps tendon tears, which have overlapping clinical features. Aspiration is curative in most cases. The bursa may be inadvertently entered during distal biceps repair, and excessive bursal distension can compress the posterior interosseous nerve.
Inflammation of the subtendinous bursa between the distal biceps and the radial tuberosity producing antecubital pain with pronation and supination, confirmed by MRI and managed with aspiration or injection.
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