Table 1 List of geometrical features to be identified for each bone, together with the corresponding parameters required by the proposed numerical routine
Bones | Features | Parameters |
|---|---|---|
Tibia | Cylinder fitted on the tibial plafond, i.e. the surface articulating with the talus excluding the medial malleolus. | Centre of medial base of the cylinder |
Centre of lateral base of the cylinder | ||
Circumference fitted on the most proximal cross-section available of the diaphysis | Centre of the circumference | |
Fibula | Plane fitted on the fibulo-talar articular surface | Normal to the plane |
Centroid of the selected articular surface | ||
Circumference fitted on the most distal cross-section of the diaphysis | Centre of the circumference | |
Talus | Cylinder fitted on the superior aspect of the trochlea tali, i.e. excluding the medial and lateral facies malleolaris | Centre of medial circumference |
Centre of lateral circumference | ||
Calcaneus | Sphere fitted on both the anterior and middle talar facets | Centre of the sphere |
Sphere fitted on the posterior talar facet | Centre of the sphere | |
Plane fitted on the surface articulating with the cuboid | Normal to the plane | |
Navicular | Sphere fitted on the articular surface between the navicular and talus | Centre of the sphere |
Medial cuneiform | Plane fitted on the anterior surface articulating with the first metatarsal | Normal to the plane |
Plane fitted on the lateral surface articulating with intermediate cuneiform and second metatarsal | Normal to the plane | |
Intermediate cuneiform | Plane fitted on the anterior surface articulating with the second metatarsal | Normal to the plane |
Plane fitted on the posterior surface articulating with the navicular | Normal to the plane | |
Plane fitted on the medial surface articulating with the medial cuneiform | Normal to the plane | |
Plane fitted on the lateral surface articulating with the lateral cuneiform | Normal to the plane | |
Lateral cuneiform | Plane fitted on the anterior surface articulating with the third metatarsal | Normal to the plane |
Plane fitted on the posterior surface articulating with the navicular | Normal to the plane | |
Plane fitted on the medial surface articulating with lateral cuneiform and second metatarsal | Normal to the plane | |
Plane fitted on the lateral surface articulating with the cuboid | Normal to the plane | |
Cuboid | Plane fitted on the anterior surface articulating with the fourth and the fifth metatarsal | Normal to the plane |
Plane fitted on medial surface articulating with lateral cuneiform and navicular | Normal to the plane |