The knee joint can be divided into three compartments – the inside of the knee (medial compartment), the outside of the knee (lateral compartment) and the space between the kneecap and the thigh bone (patellofemoral joint). Patients suitable for TKR may have loss of cartilage in all three compartments, have severe deformity, ligamentous injury or inflammatory joint disease. Patients suitable for UKR may have localised joint disease in one compartment only. Both procedures can be performed with an excellent degree of accuracy using a robotic system such as Makoplasty, Navio or Robodoc. Some of the possible advantages of UKR over TKR include a smaller incision, less tissue damage and postoperative pain, less blood loss, faster recovery and return to work / sport, greater range of postoperative movement.