FAI stands for Femoroacetabular Impingement. It’s a condition where there’s abnormal contact between the bones in the hip joint. This can occur due to various factors including deformities in the hip joint, such as a misshapen femoral head (the “ball” of the hip joint) or a misshapen acetabulum (the “socket” of the hip joint), or due to repetitive activities causing excessive wear and tear on the hip joint.
There are three types of FAI:
Cam impingement: This occurs when there is a bony overgrowth on the femoral head, causing it to rub abnormally against the acetabulum during certain movements.
Pincer impingement: In this type, there’s excessive coverage of the femoral head by the acetabulum, leading to pinching of the labrum and cartilage.
Mixed impingement: This involves a combination of both cam and pincer impingement.