a secondary analysis of data from a randomized clinical trial
BACKGROUND CONTEXT: Several therapies have been used in the treatment of chronic low back pain, including various exercise strategies and spinal manipulative therapy. A common belief is that spinal motion changes in particular ways in direct response to specific interventions, such as exercise or spinal manipulation. PURPOSE: The purpose of this study was to assess changes in lumbar region motion over 12 weeks by evaluating four motion parameters in the sagittal plane and two in the horizontal plane in LBP patients treated with either exercise therapy or spinal manipulation. STUDY DESIGN/SETTING: Secondary analysis of a subset of participants from a randomized clinical trial. PATIENT SAMPLE: 199 study participants with low back pain of more than six weeks' duration who had spinal motion measures obtained before and after the period of intervention. OUTCOME MEASURES: Lumbar region spinal kinematics sampled using a six-degree-of-freedom instrumented spatial linkage system. METHODS: Trained therapists collected regional lumbar spinal motion data at baseline and at 12 weeks follow up. The lumbar region spinal motion data were analyzed as a total cohort and relative to treatment modality (high-dose, supervised low-tech trunk exercise, spinal manipulative therapy, and a short course of home exercise and self-care advice). The study was supported by grants from Health Resources and Services Administration, Danish Agency for Science Technology and Innovation, Danish Chiropractors Research Foundation, and the University of Southern Denmark. No conflicts of interest. RESULTS: For the cohort as a whole, lumbar region motion parameters were altered over the 12-week period, except for the jerk index parameter. The group receiving spinal manipulation changed significantly in all, and the exercise groups in half, the motion parameters included in the analysis. The spinal manipulation group changed to a smoother motion pattern (reduced jerk index) while the exercise groups did not. CONCLUSION: This study provides evidence that spinal motion changes can occur in chronic low back pain patients over a 12-week period and that these changes are associated with the type of treatment.