Principles and practice of spinal adjustment; for the use of students and practitioners . e they cause a narrowing of the thorax andare thus apt to lead to pulmonary diseases. Such deformi-ties are the usual condition which is present in cases ofRound Shoulders, and the thickening of the posterior por-tion of the disc is due to the constant stretching of its pos-terior fibres by the habit of bending forward, which resultsin a species of hypertrophy of that portion of the disc. In true kyphotic subluxations the vertical diameter of theintervertebral foramen is increased, while its antero-poster
Principles and practice of spinal adjustment; for the use of students and practitioners . e they cause a narrowing of the thorax andare thus apt to lead to pulmonary diseases. Such deformi-ties are the usual condition which is present in cases ofRound Shoulders, and the thickening of the posterior por-tion of the disc is due to the constant stretching of its pos-terior fibres by the habit of bending forward, which resultsin a species of hypertrophy of that portion of the disc. In true kyphotic subluxations the vertical diameter of theintervertebral foramen is increased, while its antero-posteriordiameter is diminished as a result of being encroached uponby the inferior articular processes of each vertebra, and 262 SPINAL ADJUSTMENT also by the protrusion of the posterior portion of the discinto it. The kyphotic subluxations are seen most commonly in thedorsal region of the spine; very much less commonly in thelumbar region; never in the cervical region, unless a destruc-tive process resulting from syphilis or tuberculosis hasdestroyed a portion of these vertebrae. Fig. Kyphotic Subluxation. Lordotic Subluxation.—Lordosis is a forward bending ofa section of the spine, and is the opposite to kyphosis. Likekyphosis, lordosis is not limited to a single vertebra, butusually involves a group of vertebrae. A lordotic subluxa-tion is produced by a thinning of the posterior portion ofthe intervertebral cartilaginous discs, and this permits theinvolved vertebrae to approach each other at their posterioraspect. The lordotic subluxation is almost invariably asso-ciated with some other form of displacement, usually a pos-terior, being in reality a posterior compression subluxation, VERTEBRAL SUBLUXAIIONS 263 since the posterior part of the intervertebral disc is com-pressed. It is not, however, classed as a compression sublux-ation since the process is not confined to a single vertebra,but affects a number of vertebrae. In this form of subluxation the inferior articular p
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