Abstract
The shape of an individual’s lumbar spine in the sagittal plane can be substantially affected by the posture that is adopted. When sitting, for example, the lumbar spine is much straighter than when standing (Dolan, 1988). Within any one posture there is also a considerable variation between individuals suggested to influence the loads in the discs (Keller, 2005) and associated with pathologies such as disc degeneration (Farfan, 1972) and spondylolisthesis (LaBelle, 2004). The aims of this study were (a) to determine whether each individual has an intrinsic shape of the lumbar spine that is maintained in different postures, and (b) to establish methods to characterize this intrinsic shape. An Active Shape Model (ASM) was used to investigate the shape of the lumbar spine during standing, sitting and lying supine at two times of day, in normal volunteers.
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