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Chiropractic adjustments increase the separation (gapping) in zygapophysial joints. A cohort of 8 female and 8 male students, aged 22 to 29 years, were enrolled in the study. The subjects underwent magnetic resonance imaging (MRI) before and after either receiving lumbar side-posture adjustment or resting in side-posture position. Measurements were taken comparing the anterior to posterior space of the z joints before and after the intervention. Three radiologists also analyzed the images. Findings revealed that adjustments produced a greater gapping of the z joints than did side-posture positioning alone. Cramer GD, Tuck NR Jr, Knudsen JT, Fonda SD, Schliesser JS, Fournier JT, Patel P. J Manipulative Physiol Ther. 2000 (Jul-Aug); 23 (6): 380-394
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Chiropractic Research 
