The acetabulum, also called the cotyloid cavity, is a concave surface of the pelvis. The head of the femur meets with the pelvis at the acetabulum, forming the hip joint.
A model of the acetabulum (cotyloid cavity)
X-ray of the acetabulum, with measurements used in X-ray of hip dysplasia in adults
Hip joint. Lateral view. Acetabulum.
The ligament of the head of the femur is a weak ligament located in the hip joint. It is triangular in shape and somewhat flattened. The ligament is implanted by its apex into the anterosuperior part
A human femur head with some synovium attached at the bottom and the ligament of the head of the femur attached at the top. A blue suture wire is drawn through the ligament. Ruler in centimetres at left side.
Hip joint. Lateral view. Ligament of head of femur