The patella rests inside a groove on top of the femur called the trochlear groove. After you bend and straighten your knee, the patella moves backwards and forwards inside this groove. In kneecap replacement medical procedures, the surgeon tends to make an incision from the front of your knee, and then the http://knee cap replacement https://www.theorthopaedicandpainpractice.com/knee-cap-replacement-understanding-the-basics-of-this-orthopaedic-surgery/