Fig. 8

Pre-operative planning and post-operative evaluation. a Post-operative X-ray image. b Pre-operative planning of the tibial component. It can be seen that the rotational positional relationship between the tibia and fibula is different from the post-operative X-ray. c Pre-operative planning of the tibial component with the whole tibia. d Post-operative tibial component position. It can be seen that the rotational positional relationship between tibia and fibula is the same as the post-operative X-ray (a), but different from the pre-operative planning X-ray (b). e Post-operative tibial component positioning presented by the co-ordinates’ system as pre-operative planning. It can be seen that the tibial component is placed in more valgus, posterior slope and internal rotated position than the pre-operative planning (b). f Post-operative tibial component position with the whole tibia