Effect of pelvic tilt on lumbar spine geometry.

The purpose of this study was to use a noninvasive method to determine the effect of pelvic tilt on the lumbar spine geometry in the sagittal plane. Five healthy male subjects were instructed in performing active forward and backward pelvic tilt manoeuvres in the standing position. The lumbar spine geometry (severity of lordosis, pelvis and lumbar vertebrae orientations) was estimated with a lumbar spine geometric model. The voluntary backward pelvic tilt succeeded in reducing the depth of the lumbar spine curvature, but the forward tilt did not change it. Both pelvic tilt manoeuvres influenced the absolute orientations of the lower lumbar vertebrae and the relative orientations of some lumbar vertebrae. Interestingly, the L5/S1 joint showed was little affected by the pelvic tilt manoeuvres.

[1]  Michael A. Adams,et al.  Posture and the compressive strength of the lumbar spine , 1994 .

[2]  P. Dolan,et al.  The clinical biomechanics award paper 1993 Posture and the compressive strength of the lumbar spine. , 1994, Clinical biomechanics.

[3]  D. B. Lucas,et al.  An in vivo study of the axial rotation of the human thoracolumbar spine. , 1967, The Journal of bone and joint surgery. American volume.

[4]  P. Dolan,et al.  Passive tissues help the back muscles to generate extensor moments during lifting. , 1994, Journal of biomechanics.

[5]  Micheline Gagnon,et al.  A Geometric Model of the Lumbar Spine in the Sagittal Plane , 1993, Spine.

[6]  M. Adams,et al.  A technique for quantifying the bending moment acting on the lumbar spine in vivo. , 1991, Journal of biomechanics.

[7]  S. Hoppenfeld,et al.  Physical examination of the spine and extremities , 1976 .

[8]  S M McGill,et al.  Transfer of Loads Between Lumbar Tissues During the Flexion‐Relaxation Phenomenon , 1994, Spine.

[9]  J. T. Bryant,et al.  Method for Determining Vertebral Body Positions in the Sagittal Plane Using Skin Markers , 1989, Spine.

[10]  G. Smidt,et al.  Effect of pelvic tilt on standing posture. , 1984, Physical therapy.

[11]  I A Stokes,et al.  Back Surface Curvature and Measurement of Lumbar Spinal Motion , 1987, Spine.

[12]  W C Hutton,et al.  The effect of posture on diffusion into lumbar intervertebral discs. , 1986, Journal of anatomy.

[13]  H M Toussaint,et al.  Flexion relaxation during lifting: implications for torque production by muscle activity and tissue strain at the lumbo-sacral joint. , 1995, Journal of biomechanics.

[14]  W. Hutton,et al.  Axial Rotation of the Lumbar Spine and the Effect of Flexion: An in Vitro and in Vivo Biomechanical Study , 1991, Spine.

[15]  W C Hutton,et al.  The Effect of Posture on the Fluid Content of Lumbar Intervertebral Discs , 1983, Spine.

[16]  T Hansson,et al.  A method for the intravital measurement of interspinous kinematics. , 1992, Journal of biomechanics.

[17]  W C Hutton,et al.  The effect of posture on the role of the apophysial joints in resisting intervertebral compressive forces. , 1980, The Journal of bone and joint surgery. British volume.

[18]  C. E. Clauser,et al.  Weight, volume, and center of mass of segments of the human body , 1969 .

[19]  M. Lindh.  The Effect of Sagittal Curve Changes on Brace Correction of Idiopathic Scoliosis , 1980, Spine.

[20]  R. Cailliet,et al.  Low Back Pain Syndrome , 1963 .

[21]  J M Stevenson,et al.  Relative Lumbar and Pelvic Motion During Loaded Spinal Flexion/Extension , 1995, Spine.

[22]  K M Tillotson,et al.  Noninvasive Measurement of Lumbar Sagittal Mobility: An Assessment of the Flexicurve Technique , 1991, Spine.

[23]  T. Beeker,et al.  Toward Standards for Posture: Postural Characteristics of the Lower Back System in Normal and Pathologic Conditions , 1985, Spine.