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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 operative 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 foramen diameter，longitudinal diameter/lower vertebral height and the disc height/lower vertebral height increased significantly (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)；L 4～5 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 follow-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.
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