If the rest of the knee is still healthy, your surgeon may suggest having just a half knee replacement. The benefits of this are that the half knee replacement is intended to keep the healthy knee structures, and is intended to restore normal knee motion and function. You may go on to have a total knee replacement in the future. A unicompartmental knee replacement is a surgical procedure, in which the injured or damaged running surfaces of the knee are replaced with artificial parts which are secured to the bone.