Radiohumeral Bursa

bursa musculi extensoris carpi radialis brevis

The radiohumeral bursa, also called the bursa of the extensor carpi radialis brevis, lies between the origin of the extensor carpi radialis brevis and the radiocapitellar joint capsule at the lateral epicondyle. It reduces friction between the extensor tendon origin and the underlying joint capsule during forearm rotation and wrist extension.

Region: Forearm

Clinical Relevance

Clinical Notes

Inflammation of this bursa contributes to the symptom complex of lateral epicondylopathy (tennis elbow), and distinguishing it from the common extensor tendinopathy is clinically challenging. Ultrasound may show bursal fluid at the lateral epicondyle in addition to, or instead of, tendinopathy changes. Corticosteroid injection in this region targets both structures. At surgery for refractory lateral epicondylopathy, bursal tissue is excised alongside any degenerate tendon.

Pathology

Common Injuries & Conditions

Lateral Epicondyle Bursitis

Bursal inflammation beneath the extensor carpi radialis brevis origin contributes to lateral elbow pain, clinically indistinguishable from common extensor tendinopathy without imaging, and responds to the same conservative measures including physiotherapy and corticosteroid injection.