Talar Dome Investigation and Talocrural Joint Axis Analysis Based on Three-Dimensional (3D) Models: Implications for Prosthetic Design

Figure 3

Six points on the circles of lateral and medial crests of the talar dome were defined. (a) LT and MT were defined as the vertex of the lateral and medial crests of the talar dome from front view. (b) Two transverse outlines of the talar dome were obtained including one 8 mm beneath LT (blue line) another 5 mm beneath MT (red line). (c) Two tangent points (green points) were created by two 45-degree lines (blue lines), and the lateral crest plane created two intersections (yellow points) on the transverse outline. (d) Medial crest plane created two intersections (yellow points) on the transverse outline in the same way.