Loads transmitted during lumbosacral spinal manipulative therapy.

摘要: STUDY DESIGN An in vivo biomechanical study of three separate manipulation procedures administered random order. A computer model estimated the loads passing through spine at level interest. OBJECTIVES The difference loading effects from were contrasted for all six degrees freedom based on treatment method. Quantitative information was compared with predicted by existing models work tasks materials handling jobs. SUMMARY OF BACKGROUND DATA Benefits to patients low back pain have been reported. Little is known about biomechanics any several types available or how that are applied affect spine. Studies isolated forces during high-velocity and low-amplitude constrained conditions made. Values ranged 20 N 550 rates up 7101 N/sec. Vertebral motions arising these be 0.1 cm 1.8 degrees. Complex pass common lumbar not studied. METHODS total 54 samples order 11 volunteers. amplitude controlled, intent procedure, as large deemed clinically safe. Volunteers positioned a specially constructed table capable sensing moments axes. Myoelectric measures trunk muscles obtained surface electrode recordings. Measurements served input procedures. Statistical descriptions their component constructed, comparisons made procedure variation volunteer's initial posture. spinal activities. RESULTS Validity fidelity reaction confirmed. Muscular response negligible did enter into estimates transmitted significance (0.000 < P 0.180) found load components Effects comparable those encountered airline baggage handlers, 92% men 83% women sufficient strength sustain them. None volunteers experienced discomfort complications result tests. CONCLUSION data reported here support hypothesis may influenced patient posture selected. These loads, however, more complex than assumed. Estimates consistent observed requiring lifting twisting movements.