Our knee joint has three compartments- medial (inner compartment), lateral (Outer) compartment and patello-femoral (Front) compartment. In around 70% cases arthritis starts in inner compartment, if other two compartments are good, this can be treated by Replacement of medial compartment cartilage. This is known as partial knee replacement or unicompartmental/unicondyler knee replacement.
Medial Compartment Osteoarthritis
X-ray after Partial Knee Replacement
Implants for Partial Knee
Intra-operative image of Partial Knee