The ECRB passes through the second extensor compartment alongside the ECRL and inserts centrally on the third metacarpal base, producing pure wrist extension without significant radial or ulnar deviation. Its central position makes it the most efficient wrist extensor for power grip, as wrist extension during grip stabilises the wrist in the power position. At its lateral epicondyle origin it is the primary pathological tendon in lateral epicondylalgia.
| Muscle | |
|---|---|
| Attachment | Inserts on the dorsal base of the third metacarpal through the second extensor compartment |
Pure wrist extension (no deviation) through the most centrally positioned extensor tendon
The ECRB is the primary working tendon for wrist extension during forceful gripping activities such as tennis backhand and manual tool use, explaining why these activities exacerbate lateral epicondylalgia at its origin. At the wrist it lies deep and ulnar to the ECRL in the second compartment, and wrist-level tendinopathy can cause dorsal wrist pain in heavy manual workers. Because it gives central wrist extension, it is the usual recipient for a pronator teres transfer to restore wrist extension in radial nerve palsy. Progressive wrist extensor loading is the core of rehabilitation.
Lateral epicondyle enthesopathy at the ECRB origin producing lateral elbow pain, the most common elbow overuse injury managed with eccentric loading.
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