The dorsal radial tunnel is the anatomical corridor through which the posterior interosseous nerve passes from the anterior elbow into the posterior forearm between the superficial and deep heads of the supinator. It is the space decompressed in radial tunnel surgery.
The dorsal radial tunnel contains the four potential posterior interosseous nerve compression sites: fibrous bands anterior to the radiocapitellar joint, the recurrent radial vessels (leash of Henry), the sharp edge of ECRB, and the arcade of Frohse (supinator proximal edge). Radial tunnel syndrome is a chronic compression neuropathy at this level producing lateral elbow aching without motor deficit — distinct from PIN palsy which has motor loss.
Posterior interosseous nerve compression in the dorsal radial tunnel producing lateral elbow aching worsened by forearm rotation, without motor weakness, managed by decompression of the four potential compression sites within the tunnel.
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