Abstract: A prosthetic hip joint implant comprises an acetabular liner having an acetabular liner inner surface and defining an acetabular recess, and a femoral component comprising a head having a head outer surface and defining a head recess, a shaft having a shaft proximal end and a shaft distal end disposed within the head recess, and a covering disposed on and fixedly secured to the head outer surface, the shaft distal end, head, and covering disposed within the acetabular liner recess such that the covering is in continuous contact with the acetabular liner inner surface. Polyaxial movement of the shaft distal end produces movement of the covering along the acetabular liner inner surface within the acetabular liner recess without producing relative movement between the covering and the head.