The brachioradialis receives its motor supply from the radial nerve before it divides into superficial and posterior interosseous branches, just above the lateral epicondyle. Its innervation is therefore spared in PIN palsy and serves as a key localising landmark.
Brachioradialis function testing (resisted elbow flexion in neutral rotation) is the first motor test in radial nerve palsy assessment. Preserved BR with weak wrist extensors and absent finger extensors localises injury to the radial nerve at the spiral groove or proximally. EMG of BR confirms motor nerve integrity. BR is the muscle harvested for tendon transfer to restore wrist extension.
Preserved brachioradialis EMG activity in radial nerve injury localises the lesion to below the BR takeoff (post-axillary), guiding prognosis and reconstruction planning for radial nerve palsy.
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