If you only have arthritic damage to one compartment of the knee, either the medial or lateral, a total knee replacement might not be your best option. The iUni G2 unicompartmental knee implant preserves the parts of the knee parts not damaged by arthritis. As patients become more demanding and more active, the interest in bone and tissue sparing partial knee replacement approaches has increased dramatically. Partial knee replacement surgery also retains the option for the patient to eventually move to a total knee replacement in the future should that become necessary.