Principles and practice of spinal adjustment; for the use of students and practitioners . sent, such destructive changes occur inthe intervertebral disc that a compression subluxation nearlyalways accompanies it. Posterior subluxations occur more frequently in thethoracic than in the cervical or lumbar regions of the is due to the natural backward curvature of the vertebralcolumn in this section. These subluxations are usually aresult of an injury, or are produced by occupations whichrequire a constant stooping position. The intervertebral foramen is diminished in size antero-poster
Principles and practice of spinal adjustment; for the use of students and practitioners . sent, such destructive changes occur inthe intervertebral disc that a compression subluxation nearlyalways accompanies it. Posterior subluxations occur more frequently in thethoracic than in the cervical or lumbar regions of the is due to the natural backward curvature of the vertebralcolumn in this section. These subluxations are usually aresult of an injury, or are produced by occupations whichrequire a constant stooping position. The intervertebral foramen is diminished in size antero-posteriorly, by the backward displacement of the body ofthe vertebra which forms the anterior wall of the foramen. 274 SPINAL ADJUSTMENT The transverse processes are also displaced backward equallyon each side, while the spinous process of the affected vertebraprojects beyond that of the vertebrae above and 49. Rotary Subluxation.—This form of subluxation is a dis-placement of a vertebra which consists in a turning of thevertebra upon its axis. As a result of this twisting, the. Fig. Subluxation. spinous process of the involved vertebra will be found to theright or the left of the spinous process of the vertebra aboveand the one below it, depending upon the direction of therotation. The transverse process on one side is displacedposteriorly, while that on the other side is displaced turning of the vertebra produces a drawing out ofalignment of the intervertebral disc, and a tension uponthe various ligaments anteriorly, posteriorly, and laterally. VERTEBRAL SUBLUXATIONS 275 The articular processes are displaced posteriorly on oneside, and to the side toward which the vertebra is rotated,thus producing a lateral-posterior, but the term rotary ispreferable, since the vertebra is turned on its axis, and fur-thermore for the reason that the posterior form of displace-ment occurs in practically all the other forms of has been said
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