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目的：评价后方韧带复合体( posterior ligamentous complex，PLC )损伤在胸腰段骨折评估中的作用，评估影像学参数与 PLC 损伤的相关性。方法回顾性分析2013年1月至2013年12月，我院收治的资料完整的胸腰段骨折( T11～L2)45例，对患者术前常规行 X 线片、CT 及 MRI 检查，在 CT 正中矢状位片上测量影像学参数。根据临床和影像学评估是否存在 PLC 损伤分为两组损伤组( P 组)26例，无损伤组( C 组)19例，比较两组胸腰椎损伤分类及损伤程度评分( thoracolumbar injury classification and severity score，TLICS )和脊柱载荷评分( load sharing classification，LSC )的差异，评估两组影像学参数的差异。结果TLICS 评分：P 组(6.89±1.85)分，C 组(3.33±1.53)分，差异有统计学意义( P＜0.01)。在剔除 PLC 评分后，TLICS 评分：P 组(4.35±1.61)分，C 组(3.33±1.53)分，差异仍有统计学意义( P＝0.04)。LSC 评分：P 组(5.96±1.50)分，C 组(4.11±0.76)分，差异有统计学意义( P＜0.01)。椎体楔形角 P 组(18.3±7.4)°、C 组(13.9±6.2)°，棘突间距增加值 P 组(6.3±2.5) mm，C 组(4.5±1.8) mm 以及椎体间平移距离 P 组(3.8±1.6) mm， C 组(2.6±1.4) mm，差异均有统计学意义( P＜0.01)。椎体间平移距离＞3.5 mm 的患者比例：P 组69.2%(18/26)，C 组36.8%(7/19)差异有统计学意义( P＝0.03)。结论PLC 损伤对胸腰段骨折损伤的严重程度有显著影响，椎体间平移距离＞3.5 mm 提示 PLC 损伤。“,”Objective To access effects of posterior ligamentous complex ( PLC ) injuries on the evaluation of thoracolumbar fracture and to determine the relationship between radiographical parameters and PLC injuries. Methods Forty-five patients with thoracolumbar fractures ( T11 - L2 ) were retrospectively analyzed from January 2013 to December 2013. All patients received X-ray, CT scan and sagittal reconstruction and MRI scan. The radiographic parameters were measured on midsagittal CT scan. The patients were divided into PLC injury group ( P group, 26 patients ) and PLC intact group ( C group, 19 patients ) according to the clinical examinations and imaging findings. The thoracolumbar injury classification and severity score ( TLICS ) and load sharing classification ( LSC ) score were evaluated between the 2 groups. The radiographic parameters of the 2 groups were also evaluated. Results The TLICS score was significantly higher in the P group than in the C group [ ( 6.89 ± 1.85 ) and ( 3.33 ± 1.53 ) points, respectively, P < 0.01 ]. The TLICS ( excluded PLC score ) score was also significantly higher in the P group [ ( 4.35 ± 1.61 ) points, P = 0.04 ]. The LSC score in the P group was higher than that in the C group [ ( 5.96 ± 1.50 ) points and ( 4.11 ± 0.76 ) points respectively, P < 0.01 ]. The injured vertebral wedge angle, the increase of interspinous distance and vertebral translation were all significantly bigger in the P group than in the C group [ ( 18.3 ± 7.4 ) ° vs. ( 13.9 ± 6.2 ) °;( 6.3 ± 2.5 ) mm vs. ( 4.5 ± 1.8 ) mm; ( 3.8 ± 1.6 ) mm vs. ( 2.6 ± 1.4 ) mm, P < 0.01, respectively ]. The rate of vertebral translation bigger than 3.5 mm was significantly higher in the P group than in the C group ( 69.2%, 18 / 26 for the P group and 36.8%, 7 / 19 for the C group, P = 0.03 ). Conclusions PLC injury significantly influences the severity of thoracolumbar fracture. Vertebral translation bigger than 3.5 mm is associated with PLC injury.