Entrapment of the Posterior Interosseous Nerve Caused by Arcade of Frohse

There has been increased attention given to the radial tunnel syndrome since Roles and Maudsley first described it in 1972. The occurance of radial tunnel syndrome is due to the following four anatomical causes: the fibrous bands in front of the "radial head, the radial recurrent fan" of vessels, and the tendinous margins of extensor carpi radialis brevis and of the arcade of Frohse. In these cases, the progressive paralysis of the posterior interosseous nerve was caused by the arcade of Frohse and the radial recurrent artery. The results of splitting the arcade of Frohse and dividing the radial recurrent artery have been sufficiently good in all 3 cases.