The snapping sensation comes from the movement of a muscle or tendon moving over bone structures of the hip. The most common area where people get snapping hip is on the outside of the thigh, where connective tissue (the iliotibial band, or IT band) passes over the at portion of the thighbone, also known as the greater trochanter. As the hip bends, the iliotibial band, which is like a stretched rubber band, moves from beneath the trochanter so that it is over it causing the snapping sensation. If this is the cause of snapping hip, patients may also develop hip bursitis, which is an in ammation of the bursa, uid- lled sacs that help that help muscle glide smoothly over bone.
Another area that causes snapping hip is the tendon that runs inside of the thighbone up through the pelvis (iliopsoas tendon). When you bend and straighten your hip, the tendon shifts back and forth across the head of the thighbone, which causes the snapping.