终板环在颈椎前路椎体次全切除植骨融合术中防止钛网沉陷的临床价值

目的：探讨使用终板环对颈椎前路椎体次全切除植骨融合术后钛网沉陷及临床效果的影响。方法：对2008年2月至2011年2月采用颈椎前路椎体次全切除植骨融合术治疗的71例脊髓型颈椎病患者进行回顾性分析,男38例,女33例;年龄39-74岁,平均53.8岁。根据术中是否使用终板环将71例患者分为终板环使用组（33例）及无终板环使用组（38例）。比较两组手术前后的影像学资料及临床疗效。影像学评价指标为融合节段前凸角度（Cobb角）及融合节段椎体间前缘高度（Da）、后缘高度（Dp）及平均高度（Dm）,用以评估钛网沉陷情况;临床疗效评价指标为JOA评分,观察改善率,并记录术后症状及Odom分级。结果：71例患者的随访时间为13-34个月,平均19.5个月。影像学评价：两组患者术前及术后1周融合节段Cobb角、平均椎体间高度差异均无统计学意义（P〉0.05）。术后1年,融合节段Cobb角终板环使用组为（9.4±3.8）°,无终板环使用组为（7.5±3.9）°,差异有统计学意义（P〈0.05）;Dm终板环使用组为（57.3±2.2）mm,无终板环使用组为（55.2±2.6）mm,差异有统计学意义（P〈0.05）;沉陷的发生率终板环组为57.6%,无终板环使用组为78.9%,差异有统计学意义（P〈0.05）。临床疗效评价：两组患者术前术后在JOA评分及改善率上差异均无统计学意义（P〉0.05）。术后1年,90.9%的终板环使用组患者及89.5%的无终板环使用组患者Odom评分获得很好或较好结果。结论：终板环的使用可在一定程度上降低钛网沉陷的发生率及其程度。

The clinical value of end plate rings in preventing subsidence of titanium cage in anterior cervical corpectomy and fusion surgery

Objective: To evaluate the clinical results of using end plate rings in preventing subsidence of titanium cage in anterior cervical corpectomy and fusion(ACCF) surgery. Methods: The clinical data of 71 patients with cervical spondylotic myelopathy underwent ACCF in single segment from February 2008 to February 2011 were retrospectively analyzed. There were 38 males and 33 females, aged from 39 to 74 years old with a mean of 53.8 years. Thirty-three were used end plate rings and thirty-eight were not used (end plate rings group and no end plate ring group, respectively). The Japanese Orthopaedic Association (JOA) score, Odom's scale, imaging data were used to evaluate the clinical effects. Imaging data including Cobb angle of fusion segment, intervertebral height of anterior border (Da) and posterior border(Dp), the mean intervertebral height (Dm). Results: All patients were followed up from 13 to 34 months with an average of 19.5 months. Between two groups, there was no significant difference in Cobb angle of fusion segment and the mean intervertebral height (Dm) before surgery and one week after surgery. Whereas, one year after surgery, the Cobb angle of end plate ring group was(9.4±3.8)°, and contral group was(7.5±3.9)°, which was significantly lower than that of end plate ring group. Meanwhile, the Dm of end plate ring group was (57.3±2.2) mm, and no end ring group was (55.2±2.6) mm which was significantly lower than that of end plate ring group. The subsidence in end plate ring group was 57.6%, and was 78.9% in no end plate ring group. There was no significant difference in JOA score before and after surgery between two groups. At 1 year after operation, 90.9%(30/33) got excellent or good results in end plate ring group, 89.5% (33/38) got excellent or good results in contral group. Conclusion: The use of end plate rings could not completely prevent the subsidence of titanium cage, however, which can decrease the occurrence rate of the subsidence and lessen its degree.