[Posterior interosseous nerve paralysis after overexertion. A case report].

Entrapment neuropathies in the upper extremity are common. Spontaneous paralysis of the posterior intersosseous nerve may occur by compression at the arcade of Frohse, where the nerve enters the plane between the superficial and deep muscle bellies of the supinator. Benign soft tissue tumors, minor trauma, and local inflammation have led to paralysis of the posterior interosseous nerve in several cases. An additional report on paralysis of this nerve a few days after overexertion with later spontaneous recovery is presented.