In combination with partial knee replacement, people with submit-instability arthritis resulting from malalignment may additionally have to have tender-tissue strategies and/or osteotomy or tibial tubercle transfer surgical procedure to realign the knee. This differs from a total knee replacement, in which bone and cartilage from the entire joint are replaced. http://knee cap replacement https://www.theorthopaedicandpainpractice.com/knee-cap-replacement-understanding-the-basics-of-this-orthopaedic-surgery/