Effect of Relative Marker Movement on the Calculation of the Foot Torsion Axis Using a Combined Cardan Angle and Helical Axis Approach

<table>Foot model with (1) segment markers (light gray) and metatarsophalangeal joint markers (dark gray) (2) rearfoot and forefoot coordinate systems and (3) torsion and flexion axes.</table>

Computational and Mathematical Methods in Medicine

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Figure 1

Figure 1: Effect of Relative Marker Movement on the Calculation of the Foot Torsion Axis Using a Combined Cardan Angle and Helical Axis Approach 