髋臼横断骨折双柱内固定的生物力学分析

背景:骨盆髋臼骨折治疗的关键是精确的骨折复位和稳定的内固定。目的:分析比较3种髋臼横断骨折双柱内固定手术的生物力学特性,找到固定效果最好的双柱内固定手术方法。方法:建立各向异性的骨盆髋臼横断骨折模型,通过对最大位移、最大等效应力等评价指标的有限元综合分析,比较分析双柱螺钉、前柱螺钉后柱钢板、双柱钢板等3种双柱内固定方法在站立位置的生物力学性能差异。结果与结论:有限元分析双柱螺钉固定最大位移1.827mm,最大等效应力26.589MPa;前柱螺钉后柱钢板固定最大位移2.080mm,最大等效应力106.04MPa;双柱钢板固定最大位移2.987mm,最大等效应力200.37MPa。3种双柱内固定方法稳定性最好的是双柱螺钉固定,最后是双柱钢板固定。

Biomechanical analysis of double-column internal fixation on acetabular transverse fracture

BACKGROUND:The key of pelvic and acetabular fracture treatment is accurate fracture reduction and stable internal fixation.OBJECTIVE:To analyze the biomechanical characteritics of three kinds of double-column internal fixation operation for acetabular transverse fracture in order to find the most stable method.METHODS:Anisotropic pelvic fracture model was established,and based on the maximum displacement,the maximum equivalent stress and other comprehensive evaluation indexes,the biomechanics of double-column screw,anterior-column screw and posterior-column plate,double-column plate on the standing position were analyzed.RESULTS AND CONCLUSION:Finite element analysis showed that the maximum displacement of double-column screw was 1.827 mm,maximum equivalent stress was 26.589 MPa;the maximum displacement of screw and posterior-column plate was 2.080 mm,maximum equivalent stress was 106.04 MPa;the maximum displacement of double-column plate was 2.987 mm,maximum equivalent stress was 200.37 MPa.The most stable method is double-column screw and the last one is double-column plate.