22K views · 1.6K reactions | Femoroacetabular Impingement (FAI) is a...

Hip impingement, most commonly referred to as femoroacetabular impingement (FAI), occurs when the shape of the femur, the acetabulum, or both reduces available space in the hip joint, most notably during hip flexion, adduction, and internal rotation. Cam and pincer morphologies are extremely common in runners and athletes and frequently appear on imaging in people without pain, which is why anatomy alone does not explain symptoms. Running repeatedly places the hip into flexion and internal rotat