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Figure 2. Marker points established for data collection in sample lumbar spinal segment. Each row of markers is defined by a region, with region 1 = posterior part of vertebral body bordering vertebral endplates, region 2 =anterior spinal canal, region 3 = middle spinal canal, region 4 = posteriorspinal canal, and region 5 = area encompassing facet joints and spinous process. Samagh SP, Rosen CD, Otarodifard K, Kornswiet M, Palmer G , Lee TQ. New method for determining apparent axial center of rotation of lumbar and thoracic spine segments.J Rehabil Res Dev. 2011;48(5):587-96.DOI:10.1682/JRRD.2010.09.0168