The patella rests in a very groove on top of the femur known as the trochlear groove. When you bend and straighten your knee, the patella moves backwards and forwards within this groove. Kneecap replacement operation does entail anaesthesia and the selection is either standard anaesthesia or spinal anaesthesia (where you would continue http://knee cap replacement https://www.theorthopaedicandpainpractice.com/knee-cap-replacement-understanding-the-basics-of-this-orthopaedic-surgery/