The lateral epicondyle is the lateral prominence of the distal humerus serving as the origin of the common extensor tendon (ECRB, EDC, EDM, ECU) and the lateral collateral ligament complex. It is the site of lateral epicondylalgia (tennis elbow), the most common cause of elbow pain in adults, from overuse degeneration of the ECRB origin.
Lateral epicondylalgia (tennis elbow) produces lateral elbow pain at the ECRB origin reproduced by resisted wrist extension (Cozen test) and passive wrist flexion (Mill test). Histology shows angiofibroblastic hyperplasia rather than classical inflammatory tendinitis. Conservative management with eccentric wrist extension loading, corticosteroid injection, and PRP injection are effective. Surgical ECRB debridement is performed for truly refractory cases after 6 months of conservative management.
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