Index to Chiropractic Literature
Index to Chiropractic Literature
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ID 10846
  Title Biomechanical analysis by chiropractic radiography: Part III. Lack of effect of projectional distortion on Gonstead vertebral endplate lines
Journal J Manipulative Physiol Ther. 1988 Dec;11(6):469-473
Peer Review Yes
Publication Type Article

Projectional distortion is known to produce artifactual dysrelationships between images of osseous segments on X-ray films. According to Gonstead, lines constructed parallel to the adjacent vertebral endplates will converge if a lateral flexion malposition is present and will be parallel if no such subluxation exists. To test the accuracy of these lines, we mounted two vertebrae on supports so that the superior vertebra could be laterally flexed by a known amount upon the fixed inferior vertebra. The specimen was X rayed with no flexion or with various degrees of right or left lateral flexion of the superior vertebra. Lateral and inferior off-centering, rotation about the z axis, and object-film distance were also varied systematically. In every instance, off-centering produced no measurable effect on the position of the constructed Gonstead lines. We therefore conclude that these lines can be confidentially used to indicate structural dysrelationship during lateral flexion. No correction for projectional distortion appears to be necessary.

This abstract is reproduced with the permission of the publisher. Article only available in print.


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