Figure 1

Marker positions for ankle movement measurements (14 markers, above the knee (should not move used as reference), lateral and medial maleolus, calcaneus, lateral and medial forefoot, tip of 2nd toe) and for gait assessment (19 markers, forehead, ears, shoulders, elbow, wrists, 10th rib, iliac crest, knees, ankles, toes). We adapted the marker location compared to usual landmarks used for VICON reconstruction in order to cope with practical constraints: use of a walker hiding the legs, trunk bended position during walk, experimenter aid.