Uneven Intervertebral Motion Sharing Is Related to Disc Degeneration and Is Greater in Patients With Chronic, Non-Specific Low Back Pain: An in Vivo, Cross-Sectional Cohort Comparison of Intervertebral Dynamics Using Quantitative Fluoroscopy Greater inequality and variability of motion sharing was found in patients with CNSLBP than in controls, confirming previous studies and suggesting a biomechanical marker for the disorder at intervertebral level. The relationship between disc degeneration and MSI was augmented in patients, but not in controls during passive motion and similarly for MSV during active motion, suggesting links between in vivo disc mechanics and pain generation.
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