The Joint Preservation Center (JPC) is a cooperative effort of the Arlington Orthopedic Associates, the Surgery Center of Arlington, and Medical Center of Arlington. One of only ten such centers in the United States, it was created to provide options to patients with knee injury or pathology. Injuries to the joint surface, instabilities or angular problems are addressed. Options to repair the joint rather than replace the joint are evaluated. One of the more unique operative options is Autologous Chondrocyte Implantation (ACI). This operation repairs localized injuries in the knee joint. The JPC has helped pioneer clinical research in this area and is one of the leading centers in the United States.