The patella rests in a very groove on top of the femur known as the trochlear groove. Any time you bend and straighten your knee, the patella moves backwards and forwards within this groove. The operation ordinarily can take amongst one and three hrs. The surgeon makes a cut down the front http://knee cap replacement https://www.theorthopaedicandpainpractice.com/knee-cap-replacement-understanding-the-basics-of-this-orthopaedic-surgery/