[Posterior interosseous nerve entrapment syndrome following distal rupture of the biceps tendon: physiopathology and literature review, an unreported case report].

We report a unique and previously unreported case of motor paralysis of the posterior interosseous nerve of rapid onset in a context of hypertrophy of the short supinator muscle, occurring 2 years after a distal rupture of the biceps in a 62 year-old man. The ruptured tendon had received functional treatment due to the patient's age and low functional requirements. Operatively, the deep branch of the radial nerve was released within the arcade of Frohse with complete recovery from symptoms at 5 months. The unrepaired rupture of the distal portion of the biceps could be a risk factor for posterior interosseous nerve compression in active subjects.