A patellar fracture is a break in the patella, or kneecap, the small bone that sits at the front of your knee. A patellar fracture is a serious injury that can make it difficult or even impossible to straighten your knee or walk.| orthoinfo.aaos.org
In unicompartmental knee replacement (also called partial knee replacement) only a portion of the knee is resurfaced with metal and plastic components. This procedure is an alternative to total knee replacement for patients whose disease is limited to just one area of the knee.| orthoinfo.aaos.org
Patellofemoral pain syndrome (PFPS) is a broad term used to describe pain in the front of the knee and around the patella, or kneecap. It is sometimes called "runner's knee" or "jumper's knee" because it is common in people who participate in sports.| orthoinfo.aaos.org