Greater trochanteric pain syndrome (GTPS), is inflammation of the trochanteric bursa, a neighborhood of the hip. This bursa is at the top, the outer side of the femur, between the insertion of the gluteus medius and gluteus minimus muscles into the greater trochanter of the femur and the femoral shaft. It has the function, in common with other bursae, of working as a shock and as a lubricant for the movement of the muscles adjacent thereto. Occasionally, this bursa can become inflamed and clinically painful and tender. This condition are often a manifestation of an injury (often resulting from a twisting motion or from overuse), but sometimes arises for no obviously definable cause. The symptoms are a pain in the hip region on walking, and tenderness over the upper part of the femur, which may result in the inability to lie in comfort on the affected side.