"Extra-articular snapping hip syndrome
Extra-articular snapping hip syndrome is commonly associated with leg length difference (usually the long side is symptomatic), tightness in the iliotibial band (ITB) on the involved side, weakness in hip abductors and external rotators, poor lumbopelvic stability and abnormal foot mechanics (Overpronation). Popping occurs when the thickened posterior aspect of the ITB or the anterior gluteus maximus rubs over the greater trochanter as the hip is extended.
Athletes are at special risk for snapping hip syndrome due to repetitive and physically demanding movements. In athletes such as ballet dancers, gymnasts, horse riders, track and field athletes and soccer players, military training, or any vigorous exerciser, repeated hip flexion leads to injury. In excessive weightlifting or running, the cause is usually attributed to extreme thickening of the tendons in the hip region. Snapping hip syndrome most often occurs in persons who are 15 to 40 years old."
http://en.wikipedia.org/wiki/Snapping_hip_syndrome
"SNAPPING HIP SYNDROME
This is the injury that has plagued Joan Benoit Samuelson, the famous track star. Snapping Hip Syndrome is a clinical entity that causes pain and snapping in the hip joint. There are several known causes, the most common being the iliotibial band snapping over the greater trochanter (at the top of your thigh bone). It can also be caused by snapping of the iliopsoas tendon over the iliopectineal line (in general the pubic area of the hip bone), the iliofemoral ligaments over the femoral head (where the thigh bone connects to the hip bone), as well as other places on the hip bone."
http://www.getprolo.com/hauser_hip_pain_snaping_hip.htm
verrrry interesting…