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Variability of the spine and pelvis location with respect to the gravity line: a three-dimensional stereoradiographic study using a force platform

Variability of the spine and pelvis location with respect to the gravity line: a... Analyzing standing posture requires a precise measure of the orientation of the various body segments with respect to the gravitational vector. We studied the posture variability of 34 healthy upright standing subjects. Using a force platform combined with a powerful stereoradiographic technique, we acquired the spine and pelvis three-dimensional (3D) geometry and located it with respect to the gravity line. For our data set, the mean 3D distance between the geometrical center of each vertebral body and the gravity line was 28 mm with a standard deviation of 5.6 mm. The vertebrae location variability, defined as plus or minus twice the mean standard deviation, was ±40 mm in the sagittal plane and ±25 mm in the frontal plane. The line connecting the middle of the external acoustic meatus (center of both acoustic meati: CAM) to the middle of the bi-coxo-femoral axis (hip axis: HA) was almost vertical. Its mean distance to the gravity line was 30 mm. Our data show a left lateralization, with respect to the gravity line, of the "Head-Spine-Pelvis" segments. The mean distance was 7.6 mm (SD 1.6 mm). This might be due to uneven partitioning of the body mass on each side of the sagittal plane. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Surgical and Radiologic Anatomy Springer Journals

Variability of the spine and pelvis location with respect to the gravity line: a three-dimensional stereoradiographic study using a force platform

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References (28)

Publisher
Springer Journals
Copyright
Copyright © 2003 by Springer-Verlag
Subject
Medicine & Public Health; Imaging / Radiology; Orthopedics; Anatomy
ISSN
0930-1038
eISSN
1279-8517
DOI
10.1007/s00276-003-0154-6
pmid
13680185
Publisher site
See Article on Publisher Site

Abstract

Analyzing standing posture requires a precise measure of the orientation of the various body segments with respect to the gravitational vector. We studied the posture variability of 34 healthy upright standing subjects. Using a force platform combined with a powerful stereoradiographic technique, we acquired the spine and pelvis three-dimensional (3D) geometry and located it with respect to the gravity line. For our data set, the mean 3D distance between the geometrical center of each vertebral body and the gravity line was 28 mm with a standard deviation of 5.6 mm. The vertebrae location variability, defined as plus or minus twice the mean standard deviation, was ±40 mm in the sagittal plane and ±25 mm in the frontal plane. The line connecting the middle of the external acoustic meatus (center of both acoustic meati: CAM) to the middle of the bi-coxo-femoral axis (hip axis: HA) was almost vertical. Its mean distance to the gravity line was 30 mm. Our data show a left lateralization, with respect to the gravity line, of the "Head-Spine-Pelvis" segments. The mean distance was 7.6 mm (SD 1.6 mm). This might be due to uneven partitioning of the body mass on each side of the sagittal plane.

Journal

Surgical and Radiologic Anatomy – Springer Journals

Published: Sep 16, 2003

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