Figure 3

Matching (based on tibial geometry) and parameters calculation for an ankle in dorsal flexion relative to its neutral position. Clear space difference (∆CS), vertical offset (∆z) and translation angle (∆α) are determined by the connecting vectors (\({\overrightarrow{\mathrm{r}}}_{\mathrm{Neutral}}\), \({\overrightarrow{\mathrm{r}}}_{\mathrm{DF}}\)) of the respective tibial and fibular centroids. The illustration was made using Geomagic Design X software (3D Systems, Rock Hill, SC,USA) and Microsoft PowerPoint (Microsoft, Redmond, WA,USA).