A prosthetic hip joint comprising: (a) a femoral component including a femoral head； and, (b) an acetabular component including an acetabular cup and an acetabular cup insert, the acetabular cup insert sized to receive the femoral head, where the femoral head is sized to have a spherical center that matches a spherical center of a patient's native femoral head, where the acetabular cup is sized to have a cavity with a spherical center that matches a spherical center of a cavity of a patient's native acetabulum and, where the femoral head center of the femoral component is concentric with the center of the cavity of the acetabular cup.
