骶髂关节解剖型棒-板内固定系统的生物力学评价

目的：探讨采用新型骶髂关节解剖型棒-板内固定系统（SABP）治疗骨盆骶髂关节骨折脱位的生物力学性能。方法：采集新鲜的冷冻尸体骨盆标本20具,造成骨盆骨折模型,采用实验应力分析方法,对SABP内固定和骶骨螺钉结合Galveston技术内固定、骶骨棒固定、重建钢板固定、骶髂关节螺钉等5种固定作对照比较,分别测定它们的刚度和强度,用以评价骨盆的稳定性。结果：采用新型骶髂关节解剖型棒-板内固定系统治疗骨盆骶髂关节骨折脱位,较骶骨螺钉结合Galveston技术内固定、骶髂关节螺钉、重建钢板固定、骶骨棒固定其骨盆的刚度分别高10%、11%、16%、21%,强度分别高12%、14%、21%、31%;应变分别小13%、14%、22%、25%,位移分别小10%、12%、16%、20%,差异有统计学意义（P〈0.05）,并且超过正常人骨盆标本,但差异无统计学意义（P〉0.05）。结论：采用新型SABP内固定装置治疗骨盆骨折,其强度、刚度最佳,优于其他内固定方法,是一种理想的新型内固定器械。

A biomechanical evaluation of the sacroiliac anatomy type Bar-plate internal fixation system

Objective: To evaluate the biomechanical personality of the sacroiliac anatomy type Bar-plate system(SABP),which was of fixation usage to the fracture or dislocation of the sacroliliac joint. Methods: Twenty fresh and freeze cadaver pelvises were prepared with pelvic fracture model,compared with different internal fixation systems such as Galveston technique,transiliac rod fixation,reconstruction plate and sacroiliac joint screws using experimental stress analysis methods,and then the stability of the pelvic was obtained and evaluated. Results: Using new SABP system to treat pelvic sacroiliac joint fracture and dislocation was higher 10%,11%,16%,21% in the strength;more 12%,14%,21%,31% in rigidity;less 13%,14%,22%,25% in straining;less 10%,12%,16%,20% in shifting than the Galveston technique,transiliac rod fixation,reconstruction plate and sacroiliac joint screws,with remarkable statistic difference(P<0.05),and it was even better than cadaver p- elvis. Conclusion: To treat pelvic facture,the fixation with new SABP system is of better strength,rigidity and stability,and the SABP system is an ideal new application.