Fig. 3

The principle of Oxford UKA is to maintain knee stability by ligament tension. The varus deformity may be due to medial wear, which is generally reducible during the operation. After the tibial cut, the knee was brought into full extension. With an appropriate gap gauge (spacer block) in place, the alignment was corrected to neutral by maintaining natural ligament tension. The femoral drill reference line (line A) was drawn on the femoral surface vertical to the tibial cut plane. Following the reference, femoral bone preparation was performed and the component was implanted. UKA thus achieved ideal alignment and implant positioning