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Wrist Extensor Tendons

tendines musculorum extensorum carpi

The wrist extensor tendons comprise the ECRL and ECRB in the second extensor compartment and the ECU in the sixth. The ECRL inserts on the second metacarpal producing radial deviation with extension, the ECRB on the third metacarpal for pure extension, and the ECU on the fifth metacarpal for ulnar deviation with extension. Their balance produces the power position of slight wrist extension and ulnar deviation used in grip.

Region: Hand & Wrist

Biomechanics

Function & Actions

Wrist extension and deviation force transmission

Clinical Relevance

Clinical Notes

ECU tendon subluxation in the sixth compartment produces a painful snapping over the ulnar wrist during forearm rotation. ECRB tendinopathy at the lateral epicondyle produces lateral epicondylalgia. The extensor compartments may become stenotic (intersection syndrome between the first and second compartments) from repetitive wrist motion, producing a characteristic squeaky crepitus 4 to 6 cm proximal to the wrist joint.

Pathology

Common Injuries & Conditions

Intersection Syndrome

First and second extensor compartment tenosynovitis producing crepitus and pain 4 to 6 cm proximal to the wrist in rowers and weight lifters, managed with rest, splinting, and corticosteroid injection.