Figure 4.

The MDTA rapresents the angle considered by the intersection of a straight line passing through the anatomical axis of the tibia with the one passing through a tangent to the surface of the tibial plafond (A). The PROPHECY TC protocol requires scans 5 cm above and 5 cm beneath the knee joint line and scans of the ankle 10 cm above the tibio talar joint and including distally the whole foot (B). On the basis of the preoperative TC, a preoperative planning of the positioning of the ankle arthroplasty implant is created (C).