| Objective: To study the effect of different lumbar manipulations on the pressure of the lumbar nucleus pulposus. Design: Experimental study. Setting: Institute of Clinical Anatomy and Biomechanics, the First Military Medical University, Guangzhou, China. Subjects: Seven fresh cadaveric lumbar spines, from L1 to sacrum. Interventions: Lumbar spines were loaded on a material test system, whose computer quantitative control simulated 3 manipulations. In state A, the lumbar spines were rotated only; in state B, the lumbar spines were simultaneously rotated and compressed; and in state C, the lumbar spines were simultaneously rotated and tractioned. Main Outcome Measures: Pressures of the lumbar nucleus pulposus of L3-4, L4-5, L5-S1 were measured with pressure sensors. Result: Lumbar nuclear pressure for rotation manipulation and compression-rotation manipulation was apparently increased, and the pressures of lumbar nucleus pulposus for traction-rotatory manipulation were reduced or slightly changed. Conclusions: The results of this preliminary research suggest that rotary manipulation of lumbar spine under traction created the lowest pressures and was theoretically the safest of the 3 procedures. Click on the above link for free full text.
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