A Preliminary Report On Curative Effect Of Wallis Interspinous Dynamic Stabilization System For Lumbar Degenerative Disease

Objective : To study the safety,curative effect and indications of Wallis interspinous dynamic stabilization system for Lumbar Degenerative Disease by following-up the patients with Lumbar Degenerative Disease who were treated by Wallis interspinous dynamic stabilization system and analysising its radiographic examination and clinical results.Methods : From July 2008 to February 2010,21patients(23 intervertebral spaces,8 female, 13 male; mean age of (41.54±2.32) years) with early lumber disc herniation and lumbar spinal stenosis were treated with Wallis interspinous dynamic stabilization system . 4 cases of L3-4,19 cases are L4-5 intervertebral space. The primary indication for surgery was degenerative disease(disc/stenosis) resulting in some form of instability associated with neurogenic or radicular pain and/or chronic back pain. The main diagnosis was in 8 of 21 cases stenosis, in 13of 21 Lumbar Disc Prolaps.Observed the time of total operation and implantation ,the bleeding ,and early recovery . Clinical outcomes variables, assessed preoperatively and postoperatively, included lumbar and leg pain visual analog scale (VAS) ,Oswestry disability index (ODI) scores ,the Japanese Orthopaedic Association score (JOA) for low back pain, the ROM,the ADH,PDH, Odom score, SF-36 and ADL. At these assessments flexion/extension radiographs,CT and MRI were obtained. Result:21 patients were followed up for average13.1 months (2-19 months) after the operation . Mean time of surgery overall was 80土20min, with an average of 25土5min required for implantation. Average blood loss was 150土30ml. NO leakage of cerebrospinal fluid,infection , hernia of residual intervertebral disk or spinous fracture. The VAS and ODI scores at 7 days after operation dropped from (7.5±1.0) and (40.0土2.5)scores to (4.0土1.0)and (30土1.5)scores(P<0.01) .The JOA score (29 point scale) significantly improved (P<0.01) from (18.52±1.14) preoperatively to( 21.22±1.5)postoperatively. Odom's assessment were categorized as'good'or'excellent', this being sustained over the period of the study. The ROM had a significant difference between preoperatively to 6 months postoperatively. The MRI showed that no compression of spinal cord and improvement of disc signal. The degeneration of proximal disc did not aggravate.Conclusion: The Wallis dynamic stabilization systerm ,as a non-rigid fixation technique can preserve the mobility, anatomy and stability of operated lumbar vertebral bodys, promote the recover of the lesion discs ,and protect the degeneration of adjacent dics. It is safe and easy to use Wallis interspinous dynamic in the treatment of lumbar degenerative disease,with the advantage of mini invasion and early effect.