Principles and practice of spinal adjustment; for the use of students and practitioners . 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 i
Principles and practice of spinal adjustment; for the use of students and practitioners . 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 of the posterior form will, however, applyhere to a less degree, as the displacement is limited by thesize of the intervertebral foramen, since the anterior surfaceof the superior articular process of the vertebra below wouldcome into contact with the posterior surface of the body of. Fig. Subluxation. the vertebra above it. This form of subluxation is frequentlyassociated with scoliosis. Rotary subluxations are possible in all regions of thespine, but occur with least frequency in the cervical region,as the vertebrae in this region are so constructed with adownward tilt of their transverse processes, and a flange atthe sides of the upper surface of their body that they are wellprotected against any radical rotation. The normal spinepermits considerable rotation in this region without displace-ment, but this movement is confined principally to the rota-tion of the atlas upon the odontoid process of the axis; theother cervical vertebrae rotate en masse, the rotation of each 276 SPINAL ADJUSTMENT individual vertebra being relatively slight, as a rule. How-ever, the rotary displacement in this region may become pro-nounced when associated with one of the other forms ofsu
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