The common extensor origin is the conjoined tendinous attachment of the wrist and finger extensor muscles to the lateral epicondyle of the humerus. The extensor carpi radialis brevis (ECRB) is the dominant and most clinically relevant component, arising from the anterior-inferior face of the lateral epicondyle. Other contributors include extensor digitorum communis, extensor digiti minimi, and extensor carpi ulnaris, all originating from the lateral epicondyle or immediately adjacent lateral supracondylar ridge.
| Muscle |
|
|---|---|
| Attachment | Lateral epicondyle of the humerus |
Anchors the forearm extensors for wrist and finger extension
Common extensor origin tendinopathy (lateral epicondylitis, tennis elbow) affects 1-3% of the population and is dominated by ECRB pathology, with intratendinous tears and angiofibroblastic hyperplasia at the ECRB origin. Diagnosis is clinical: point tenderness at the lateral epicondyle reproduced by resisted wrist extension (Cozen test) or resisted middle finger extension. Management progresses from load management, physiotherapy and injection to PRP and surgical ECRB debridement. The deep posterior part of the origin blends with the lateral collateral ligament complex, which should not be injected and must be preserved at surgery to avoid iatrogenic posterolateral rotatory instability. The common extensor origin is also split in the lateral approach for radial head fracture repair.
Angiofibroblastic degeneration of the extensor carpi radialis brevis at the anterior lateral epicondyle origin produces tennis elbow with maximum tenderness at the epicondyle reproduced by resisted wrist extension; PRP injection targets the tendinopathic ECRB origin directly under ultrasound guidance, and surgical debridement releases the diseased tissue via an open or arthroscopic approach.
Uncommon complete tear of the origin from forced wrist flexion, trauma or after repeated steroid injections, producing sudden lateral elbow pain and extension weakness, repaired surgically in active patients.
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