【Abstract】 ObjectiveTo explore the mediumterm and longterm clinical efficacy of microendoscopic accurate decompression via posterior approach for treating posterior edge separation of vertebral body. MethodsThirty two patients with posterior edge separation of lumbar vertebral body underwent microendoscopic accurate nerve root canal decompression via posterior approach. Visual Analog Scale(VAS) was used to evaluate the back and leg pain before operation, after 3 days of operation and at the last followup. Oswestry disability index(ODI) was used to assessed the longterm efficacy. The sagittal diameter of lateral recess was measured through CT to evaluate the recrudescence and bone growth. ResultsThe followup was performed in 26 cases, and the average duration of followup was 96 months. There was significant difference between the preoperative VAS of back and leg pain and the VAS after 3 days of operation or at the last followup(P＜0.05).Significant difference was also found between the preoperative ODI ［(46.82±12.68) scores］and the ODI after 3 days of operation ［(20.21±8.93) scores］or at the last followup［(15.65±7.56) scores］(P＜0.05). There was significant difference between the preoperative sagittal diameter of lateral recess and the diameter after 3 days of operation or at the last followup(P < 0.05). Recrudescence occurred in 1 case after 3 months of operation, and interbody fusion and internal fixation was performed for repairing. ConclusionFor posterior edge separation of vertebral body, microendoscopic accurate decompression via posterior approach can achieve a satisfied longterm efficacy. Dynamical progression is not observed in the bone separated from the posterior edge. And it is optional of surgical approach.

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