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. Author manuscript; available in PMC: 2010 Apr 28.
Published in final edited form as: IEEE Trans Neural Syst Rehabil Eng. 2007 Dec;15(4):517–525. doi: 10.1109/TNSRE.2007.906967

Fig. 5.

Fig. 5

Cartesian coordinate system used in the study. Origin of the coordinate system was at the center of the femoral head. The X axis was along the femoral shaft pointing to the distal. Y and Z axes were pointing to the medial and the superior, respectively. Thirty ROIs were identified over the skin of the sitting area. The buttock–thigh area was divided into four regions, the DM, DL, PM, and PL regions.