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. 2012 Apr 18;470(11):3127–3133. doi: 10.1007/s11999-012-2347-y

Fig. 1.

Fig. 1

Schematic representing the calculation of the contact patch to rim (CPR) distance. Angle α (14°) is the medial deviation of the joint reaction force from vertical in the frontal plane and angle β (16°) is the forward deviation of the joint reaction force from the transverse axis in the horizontal plane. These values represent average direction measurements made by Bergmann et al. [11] for the standing position.