Comparison of Lumbar Changes after X-Stop System and Wallis System Implantationm

Jiang Tao; Fu Tao; Ba Zhengguo

Abstract：Objective To compare the postoperative changes of lumbar structure after implanting X-Stopsystem and Wallis system.Methods 80 patients with lumbar degenerative disc disease from December 2011 to December 2015 were randomly divided into two groups:group A was implanted with X-Stop system,group B was implanted with X-Stop system.We compared the efficacy and lumbar structure changes.Results There was no significant difference in opera-tive time and blood loss between two groups(P>0.05),but implantation time of group A was significantly lower than group B (P<0.05);After treatment,VAS score and ODI score decreased significantly (P<0.05),but there was no statistically significant difference between two groups (P>0.05).After surgery,patients’Cobb angle,intervertebral fo-ramen diameter,longitudinal diameter/lower vertebral height and the disc height/lower vertebral height increased sig-nificantly (P<0.05)in both groups.And the isc height/lower vertebral height in group A was significantly higher than group B after treatment,(P<0.05);L4~5 segmental motion ROM value decreased after surgery (P<0.05),but group B decreased more significantly (P<0.05).There was no significant change in Woodend points before and after surgery in two groups (P>0.05),and no statistically significant difference between two groups (P>0.05).During 1-year fol-low-up,patients were satisfied with surgery affect,and had a good recovery,there were no significant complications such as infection,nerve damage,fixation failure or dural sac rupture occured.Conclusion Both of X-Stop system and Wallis system are safe and effective which can effectively restore lumbar lordosis,increase the height of intervertebral space and intervertebral foramen area,but the X-Stop is more effective compared to the Wallis in increasing the height of the intervertebral space.