Treatment of 94 outpatients with chronic discogenic low back pain with the DRX9000: A retrospective chart review

Background: This study's goal was a retrospective chart audit of 100 outpatients with discogenic low back pain (LBP) lasting more than 12weeks treated with a 2-month course of motorized spinal decompression via the DRX9000 (Axiom Worldwide, Tampa, FL, U.S.A.). Methods: Patients at a convenience sample of four clinics received 30-minute DRX9000 sessions daily for the first 2weeks tapering to 1 session/week. Treatment protocol included lumbar stretching, myofascial release, or heat prior to treatment, with ice and/or muscle stimulation afterwards. Primary outcome was verbal numerical pain intensity rating (NRS) 0 to 10 before and after the 8-week treatment. Results: Of the 100 initial subjects, three withdrew their protected health information, and three were excluded because their LBP duration was less than 12weeks. The remaining 94 subjects (63% female, 95% white, age=55 (SD 16) year, 52% employed, 41% retired, LBP median duration of 260 weeks) had diagnoses of herniated disc (73% of patients), degenerative disc disease (68%), or both (27%). Mean NRS equaled 6.05 (SD 2.3) at presentation and decreased significantly to 0.89 (SD 1.15) at end of 8-week treatment (P < 0.0001). Analgesic use also appeared to decrease (charts with data = 20) and Activities of Daily Living improved (charts with data = 38). Follow-up (mean 31weeks) on 29/94 patients reported mean 83% LBP improvement, NRS of 1.7 (SD 1.15), and satisfaction of 8.55/10 (median 9). Conclusions: This retrospective chart audit provides preliminary data that chronic LBP may improve with DRX9000 spinal decompression. Randomized double-blind trials are needed to measure the efficacy of such systems.