Pain in the groin area, particularly after the hip has been flexed (such as after running or jumping or even extended periods sitting down).The inability to flex the hip beyond a right angle.In the early stages, there may be no symptoms associated with hip impingement or symptoms may be mild or vague. In fact, untreated hip impingement is thought to lead to osteoarthritis in many patients. Note that hip impingement can occur with or without the presence of osteoarthritis. This results in cartilage and labral damage.īoth conditions can exist at the same time, leading to cam and pincer impingement or combined impingement. With hip flexion motion, the neck of the femur bone “bumps” or impinges on the rim of the deep socket. Pincer impingement involves excessive coverage of the femoral head by the acetabulum. This interferes with the femoral head’s ability to move smoothly within the hip socket. An injury may also cause symptoms of hip impingement.įurther, certain conditions, such as Perthes disease and slipped capital femoral epiphysis (SCFE), may cause hip impingement.ĭoctors talk about two main types of hip impingement.Ĭam impingement occurs because the ball-shaped end of the femur (femoral head) is not perfectly round. Repetitive activity involving recurrent movement of the legs beyond the normal range of motion may cause hip impingement, which has been observed in certain athletes (football, baseball, soccer, tennis, hockey, lacrosse players, dancers, and golfers). In other cases, the hip joint may have become structurally abnormal during development. People with hip impingement may have been born with a structurally abnormal ball-and-socket joint. Over time, repetitive “bumping” or impingement of the femur on the rim of the acetabulum leads to cartilage and labral damage. Hip impingement may be caused by a misshapen femoral head, deformed femoral neck, or a hip socket that covers too much of the femoral head. Hip impingement occurs when something prevents the smooth, painless, and free movement of the ball-and-socket joint. The rim of the hip socket is lined with a special ridge of cartilage called the labrum that further helps to secure the femoral head in place inside the hip socket. The ball and socket are lined with a thin layer of smooth cartilage that cushions and protects the bones, preventing them from rubbing or grinding against each other. It can occur in people of all ages, including adolescents and young adults.In the healthy hip, the rounded top of thigh bone (femoral head) “plugs into” the hip socket (acetabular socket) in such a way that the femoral head can move smoothly within the socket. Femoroacetabular impingement (FAI), also known as hip impingement, as a mechanical or structural disorder of the hip.
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