Patellofemoral arthritis takes place once the articular cartilage together the trochlear groove and over the underside of the patella wears down and will become inflamed. Potent ligaments hook up the highly effective muscles on the thigh and calf towards the bones around the knee to manage knee motion and performance. http://knee cap replacement https://www.theorthopaedicandpainpractice.com/knee-cap-replacement-understanding-the-basics-of-this-orthopaedic-surgery/