Like any other bone, the 3 bones in the knee can suffer from fractures. Fractures to the patella (knee cap) are common as the bone sits on top of the knee joint as a protective shield, meaning it can fracture if you fall or have direct impact on the area.
Surgery may be required if the bone needs stabilising.
A dislocated kneecap is when the bone slips out of place, usually as a result of direct impact or a sudden change in movement and twisting of the knee.
Often, your doctor can manipulate the kneecap back into place.
If there is a fracture or associated ligament or tendon injury then surgery may be considered.