Fig. 8

Comparison of postoperative result to the preoperative plan of the tibia with Materialise 3-matic software. Each picture shows two porcine tibial bone models. The preoperative model is grey while the achieved result is green. Both models were fitted distally (automatic registration, a). Subsequently, the measurements of varus/valgus (b), procurvatum/recurvatum (c) as well as rotation (d) were performed proximally. The blue lines indicate a tangent to each of the bone at defined points. For varus/valgus and rotation a tangent to the most proximal point of the medial and lateral tibial plateau was drawn. For procurvatum/recurvatum, the tangent was fitted to the posterior tibial cortex on a lateral view. The angle between these lines represents the respective deviation from the plan