Femoral acetabular impingement is characterized by a bone bump on the femoral neck that pinches the labrum and acetabular rim during hip movement.

“basically on on the neck right around here that's actually sort of in the front a bump develops so if I if I look at the model of a model here of the uh ephemeral neck and there's sort of one here and this is typically the location of it and I'll just color it you get a prominent bunk of bone so this area it's called a cam lesion and what happens is it changes the shape of the at the head and neck Junction so it's not really spherical it's sort of this oblong shape so that when it goes into the acetabulum it can pinch on the acetabular rim and on the acetabular rim is not only the cartilage but the labrum”