Complex sentence: Femoroacetabular Impingement (FAI), or hip impingement syndrome, may affect the hip joint in young and middle-aged adults and occurs when the ball shaped femoral head rubs abnormally or does not permit a normal range of motion in the acetabular socket.
Split into simpler sentences: Femoroacetabular Impingement (FAI), or hip impingement syndrome, may affect the hip joint in young and middle-aged adults. Impingement occurs when the ball shaped femoral head rubs abnormally or does not permit a normal range of motion in the acetabular socket.