Paired Magnetic Resonance Imaging and Clinical Outcomes Following Intervertebral Differential Dynamics Therapy for Cervical and Lumbar Disc Bulges and Herniations: A Secondary Analysis of a Retrospective Cohort
TL;DR
Completion of IDD Therapy was associated with substantial clinical improvement and favorable paired-MRI changes in most patients in this selected cohort and the findings are hypothesis-generating rather than causal.
Abstract
Background: Intervertebral Differential Dynamics (IDD) Therapy is used as a targeted, non-surgical decompression intervention for selected patients with disc-related spinal pain. A previously published cohort reported significant short-term improvements in pain and disability, while paired magnetic resonance imaging (MRI) outcomes were reserved for subsequent analysis. Objective: To evaluate paired MRI findings and clinical outcomes following IDD Therapy in adults with MRI-confirmed cervical or lumbar disc bulges and herniations. Methods: This retrospective secondary analysis included 21 adults with 47 treated disc levels who completed a 30-session protocol. Previously published Visual Analog Scale (VAS) and Oswestry Disability Index (ODI) outcomes were linked to paired MRI measurements. Posterior disc contour extension, canal anteroposterior diameter, and disc height were analyzed separately for 14 lumbar and 7 cervical index lesions. Radiographic response and exploratory clinical-imaging correlations were also evaluated. Results: Mean VAS improved from 5.8 to 1.5 and ODI from 18.5 to 6.5 in the parent cohort. Lumbar mean changes were -1.75 mm for disc contour extension, +1.31 mm for canal diameter, and +0.64 mm for disc height; cervical mean changes were -1.20 mm, +0.89 mm, and +0.53 mm, respectively. All region-specific changes were statistically significant. Global radiographic improvement was observed in 16 of 21 patients and 34 of 47 treated levels. Disc contour reduction was strongly associated with VAS improvement (r=0.95; 95% CI, 0.88-0.98; P<0.001). Conclusions: Completion of IDD Therapy was associated with substantial clinical improvement and favorable paired-MRI changes in most patients in this selected cohort. Because the study was retrospective, lacked a comparator, used non-standardized clinical imaging, and included only treatment completers, the findings are hypothesis-generating rather than causal.