Hip and knee replacement components last a long time, but do not always last forever. Despite successful primary surgery, some people ultimately require revision surgery, where some or all of the prosthetic components are exchanged. Revision joint replacement surgery is when some or all of the existing joint replacement implants are removed and new ones are implanted. A minor revision is when modular components that are fixed to other implants rather than to the bone are exchanged. A major revision is when implants that are fixed to bone are exchanged. Sometimes not all of the implants need to be exchanged, even in a major revision. One of my interests is investigating and managing patients who are not satisfied with their total hip or knee joint replacement.