骨盆骨折S_1螺钉结合棒板内固定系统的生物力学评价

目的探讨采用自行研制的S1螺钉结合棒-板内固定系统治疗骨盆骨折的生物力学性能,为临床应用提供科学依据.方法采集新鲜的冷冻尸体骨盆标本10具,造成C1～3骨盆骨折模型,分别应用S1螺钉结合棒-板内固定系统、S1螺钉结合Galveston技术内固定、骶骨棒、骶髂关节螺钉、前路重建钢板等内固定方法固定,采用实验应力分析方法对其力学性能进行比较研究.结果骨盆骨折采用S1螺钉结合棒-板内固定系统,其强度、刚度、稳定性均接近正常骨盆,统计学无显著性差异(P＞O.05),与其它内固定方法比较均有显著差异(P＜0.05).结论采用S1螺钉结合棒-板内固定系统治疗骨盆骨折,其强度、刚度最佳,优于其它内固定方法,是一种理想的新型内固定器械.

Biomechanical Evaluation of S_1 Screw and Rod-Plate Internal Fixation Developed for Fixation of Pelvic Fracture

Objective To evaluate biomechanical properties of a S 1 pedicle screw and rod-plate internal fixation developed by author for fixation of vertically unstable pelvic fracture and therefore to provide scientific foundations before clinical application. Methods Twenty fresh frozen cadavaric pelvis were used to create C 1-3 pelvic fracture (Tile classification). The fracture was fixed by using S 1 pedicle screws and rod-plate internal fixation, S 1 pedicle screw and Galveston technique, transiliac rod fixation, iliosacral screw fixation, and reconstruction plate, respectively. The mechanical stability of these five different internal fixation approaches was compared by using stress analysis method. Results Under the same load condition, the strength, rigidity and stability of S 1 pedicle screw and rod-plate internal fixation showed significantly better results than other methods and there was no statistical difference when compared with the result of intact control ( P <0.05). Conclusion S 1 pedicle screw and rod-plate internal fixation was a better internal fixation approach as compared with other tested ones, which implied a new fixation method for potential clinical application.