The labrum is the seal that “glues” the ball and socket—the femoral head to the acetabulum. When the labrum tears, the ball and socket may dislodge, causing instability and loss of lubrication. Symptoms of a labral tear include sharp pain in the groin, thigh or leg, stiffness, “popping,” and decrease in range of motion.
One of the most common causes of labral tears is known as Femoroacetabular Impingement (FAI). There are two types of FAIs: Pincer impingement and Cam Impingement. Pincer impingement involves an excess of rim tissue of the acetabulum. When the hip moves, the leg bone rubs against the pincer lesion. If not addressed quickly, pincer impingement may crush the labrum where it serves as a cushioning agent between the femoral neck and the acetabulum. Cam Impingement is a lesion or bump that forms right on the femoral head. When in motion, the lesion bumps against the labrum and the cartilage of the acetabulum.