Snapping hip: a rare form with internal etiology.

"Internal" extraarticular snapping hip, rare and often misdiagnosed, can cause functional limitation of the hip and severe gait disturbances. It is provoked by the iliopsoas tendon which catches on the lesser trochanter or the iliopectineal eminence, as in the case described in this paper. Standard surgical treatment consists in lengthening the tendon, and the authors suggest an inguinal approach.