Patellofemoral arthritis happens when the articular cartilage together the trochlear groove and within the underside in the patella wears down and becomes inflamed. This differs from a total knee replacement, during which bone and cartilage from your complete joint are replaced. Most overall knee replacements at HSS are done less http://knee cap replacement https://www.theorthopaedicandpainpractice.com/knee-cap-replacement-understanding-the-basics-of-this-orthopaedic-surgery/