Abnormal hip joint morphology Protrusio acetabuli HP:0003179 SNOMEDCT_US:59606006 UMLS:C0409495 Protrusion of the acetabulum, which is the socket that together with the head of the femur forms the hip joint. The protrusion is the result of increased depth of the socket and results in medial displacement of the femoral head. Acetabular protrusion Intrapelvic bulging of the medial acetabular wall. Protrusio acetabulae Abnormally indented hip sockets