Because of the interest in the recent publication on peripheral entrapment neuropathies of the upper extremity, it was decided to review these conditions in the lower extremity. An entrapment point occurs in the course of a nerve where the anatomic configuration may cause constriction of the nerve, or, if trauma has occurred to the area, the particular anatomic disposition will maintain the nerve in a state of inflammation. The entrapment phenomenon occurs at these points because there is little latitude for dimensional alteration in the cross-sectional area permitted for the passage of the nerve. The passageway, either an osseofibrous tunnel . . .