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Chiropractic Research Review

Use Preload Conditions to Determine Adjustment Vectors

Motion-segment analysis contains sufficient information to determine the initial preloaded/fixed position of a vertebra and a corrective adjustment vector. Two hundred and thirty-one sets of cervical motion study x-rays were analyzed to investigate the frequency distribution of the preloaded state for each of the individual motion segments.

The results demonstrated a biomechanical codependence of some of the individual motion segments and randomness of others. These codependent relationships suggest that a priority ordering for segmental adjusting may be appropriate to produce more efficient and effective case management.

A computer and an electromagnetic grid can be used to record the x, y coordinates of specific osseous landmarks from neutral, flexion and extension x-ray views. Organizing the results in graphical and tabular formats easily identifies the neutral preload position of a vertebra as either a flexion or extension fixation. Determining the functional preload condition provides the most accurate vector information for restoring the true neutral position of a vertebra.

Wiegand R. Graphical analysis and frequency distribution of dysfunctional motion segments in the cervical spine using digital x-ray transfer and database technologies. Chiropractic Research Journal, Spring 1997;IV(1), pg28. Reprints: (800) 543-3460 or e-mail at eowens@life.edu

Chiropractic Research Review

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