Term Efficacy Of The Treatment Of Lumbar Degenerative Disease Of The Wallis Dynamic Stabilization System

Objective:To review the early clinical outcome of posterior dynamic stabilization system (Wallis) in lumbar degenerative disease, and investigate the advantage and problems of the technique.Methods:30 patients with lumbar degenerative disease were implanted with Wallis Posterior dynamic stabilization systems from May 2008 to Oct.2009 in the orthopaedics of Dong Zhimeng hospital. The JOA scores were recorded to be used for clinical evaluation,and Cobbs method was used for lumbar range of motion(ROM)at the L4/5 level measurement on dynamic lateral X—ray films before and after the operation. The early effect and complications associated with Wallis posterior dynamic stabilization were recorded.Results:All cases obtained the follow-up from us. Compared with pre-operation, there was a significant improvement in the patients'symptom at 2 weeks post-operation and 6 months post-operation. The JOA Scores were (13.73±2.64),(23.73±j2.10),(24.9±2.34) at pre-operation,2 weeks post-operation and 6 months post-operation, respectively, and had a statistical difference (P<0.05)。The ROM of L4/5 level were (23.57±1.55)°,(18.83±1.32)°at pre-operation and 6 months post-operation, respectively. Compared with pre-operation, the ROM of L4/5 level at 6 months post-operation had a significant decrease (P<0.05).Conclusions:Wallis posterior dynamic stabilization is an easy, safe and effective interspinous stabilization system in the treatment of degenerative lumbar disease,It spend less time to complete the operation with less injury and bleeding,and also could maintain the normal physiological curve and ROM of the lumbar, protect permanently the adjacent centrum sections,slower the degenerative change of adjacent centrum sections and decrease the correlative rate of the second operation. The early effect is good, while the long-dated effect need farther follow-up.