Snapping of the hip includes two different causes, both of which result in an audible, palpable, or visual snapping of a tendon or fascia over a part of the hip joint.  The two different types of snapping hip include internal and external snappingInternal snapping can typically be heard as a clunk when the hip joint is bent up (flexed) or made straight (extended).  The snapping is a result of a tight hip flexor tendon (psoas, “so-as”) over the front of the ball of the hip joint.  As the ball rolls from flexion to extension or from extension to flexion, the tight tendon snaps over the ball like a rubber band.  External snapping of the hip occurs as a result of a tight IT band (iliotibial band) and frequently a tight gluteus maximus fascia.  External snapping can be seen easily over the outside of the hip as the IT band snaps over a prominence (greater trochanter) on the side of the thigh bone (femur).  In both cases, the snapping causes pain and limited function.  Non-surgical treatment is the first step in treatment for both types, and many patients gain relief of symptoms after rest, anti-inflammatory medications (NSAIDs), activity modification, physical therapy, and injections.  For those who do not improve, surgery is an option, and the tendon or fascia can be lengthened to eliminate snapping.