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Figure 2


Fig. 2. The marker setup and angle definitions. Subjects were marked at the hip (trochanter major), knee, ankle and ball of the foot as well as on the head and the vertebra T1 (head and T1 markers are not shown in the sketch). We calculated the inner angles at the knee ({varphi}knee) and ankle ({varphi}ankle) joint. According to the spring–mass model, we defined the leg as the distance between the hip and toe marker. The leg angle ({alpha}) is measured clockwise with respect to the negative x-axis.





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