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Effects of local coordinate systems on trunk kinematics

In pathological gait, trunk motion is usually studied. Different trunk coordinate systems (TCS) were published to describe the kinematics of this segment. TCS definition is mainly dependant of the markers sets. For children clinical gait analysis it is sometimes needed of minimizing the number of markers. ISB recommended TCS using four trunk markers (Wu et al. 2005). We propose a new TCS constructed with a reduced quantity of markers: only one on the trunk, and traditional others on the shoulders and pelvis. In order to validate our approach, we compare the accuracy and the robustness of three different markersreduced TCS (two proposed in the literature by Starr et al. (2000) and by Nguyen and Baker (2004), and our TCS), with the reference model recommended by ISB.