• J Spinal Disord Tech · Jul 2014

    A biomechanical cadaveric study of a modified U-shaped interspinous distraction device.

    • Weerasak Singhatanadgige, Pairat Tangpornprasert, Yongsak Wangroongsub, Pibul Itiravivong, and Noppachart Limpaphayom.
    • *Department of Orthopedics, Faculty of Medicine, Chulalongkorn University †King Chulalongkorn Memorial Hospital, Thai Red Cross Society ‡Department of Mechanical Engineering, Faculty of Engineering, Chulalongkorn University, Bangkok, Thailand.
    • J Spinal Disord Tech. 2014 Jul 1; 27 (5): 290-6.

    Study DesignAn experimental study.ObjectiveTo analyze the effects of a modified U-shape interspinous distraction device (IDD) on the stability of a destabilized lumbar spine model.Summary Of Background DataThe use of IDD for treatment of lumbar spine pathology remains a subject of debate. A modified design of an IDD consisted of a titanium (Ti) U-shape dynamic stabilizer and a Ti tensioning wire loop was biomechanically tested.Materials And MethodsSix sets of cadaveric lumbar vertebrae levels 1-5 (L1-L5) were subjected to loads in flexion, extension, and lateral bending in the 4 following sequences: intact specimen, unilateral facetectomy and discectomy at L3-L4, insertion of the modified U-shape IDD at L3-L4, and pedicle screw fixation at L3-L4. The range of motion (ROM) of L3-L4 following modified U-shape IDD insertion was compared with that of the intact specimen. The ROM of the adjacent vertebrae (L2-L3 and L4-L5) following modified U-shape IDD insertion was compared with that after pedicle screw fixation. Statistical analysis was performed using the Wilcoxon signed-rank test.ResultsThe modified U-shape IDD decreased the ROM of a destabilized L3-L4 in all testing load (P<0.05). The stability of L3-L4 following the modified U-shape IDD insertion was restored to that of the intact specimen (P>0.05). The ROM at adjacent vertebrae after the modified U-shape IDD placement was similar to the ROM obtained after pedicle screw fixation at L3-L4.ConclusionsThe modified version of a U-shape IDD is effective in stabilizing an unstable segment of the lumbar spine. The device does not create deleterious effects on the adjacent vertebrae.

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