Location



The radial tunnel is on the dorsum of the forearm 5 centimeters distal to the lateral epicondyle

Significance



Radial tunnel syndrome is a compression neuropathy of the posterior interosseous nerve (a division of the radial nerve) in this area. Testing resisted middle finger extension (which produces pain) can be used to help make the diagnosis. The posterior interosseous nerve is a purely motor nerve.

Figures