A further variable predisposing clients to patellofemoral arthritis is excessive hip anteversion (also called femoral anteversion), a affliction through which the neck of the femur rotates much too much ahead from the hip socket, causing more lateral (sideways) pull on the patella. The first bone your surgeon will resurface is http://knee cap replacement https://www.theorthopaedicandpainpractice.com/knee-cap-replacement-understanding-the-basics-of-this-orthopaedic-surgery/