复杂髋臼骨折内固定的生物力学研究

目的分析研究复杂髋臼骨折内固定的生物学特点,为临床治疗提供相关生物力学依据。方法以髋臼横形骨折及后壁骨折为骨折模型,采用3种不同内固定方式[前柱钢板加后柱螺钉（SPG）、前柱螺钉加后柱钢板（PSG）、双柱钢板（PPG）]进行生物力学实验。结果3种不同内固定方式下的各点应变值与正常状态下应变值之比,分别记做SPG/NG（1组）、PPG/NG（2组）、PSG/NG（3组）,每组根据要求设立5个应变点。1组为：2.70、1.47、2.18、1.59、1.67;2组为：0.94、0.89、0.75、0.76、0.92;3组为1.06、1.05、1.32、1.52、1.22。3组经方差齐性检验和t检验比较,差异均有统计学意义（P〈0.05）。结论前柱螺钉加后柱钢板组的效果不如双柱钢板组及前柱钢板加后柱螺钉组,前柱钢板加后柱螺钉组略优于双柱钢板组。

Biomechanical study of complicated acetabular fracture treated with internal fixation

Objective To discuss the biomechanical characteristics of complicated acetabular fracture treated by internal fixation.Methods Transverse and posterior wall fracture of acetabulum models were set up.The different kinds of internal fixations were divided into three groups： anterior wall with screw and posterior with plate group（SPG）,both wall with plate group（PPG）,anterior wall with plate and posterior wall with screw group（PSG）.Results Proportion of the strain value of each testing points in different internal fixation named SPG/NG,PPG/NG and PSG/NG,the SPG/NG： 2.70,1.47,2.18,1.59,1.67;the PPG/NG：0.94,0.89,0.75,0.76,0.92;the PSG/NG：1.06,1.05,1.32,1.52,1.22.Statistics showed a significant difference（P〈0.05） between SPG/NG and PPG/NG,PPG/NG and PSG/NG,SPG/NG and PSG/NG.Conclusions In the different kinds of internal fixations,the anterior wall with screw and posterior with plate group was worse than the other two groups,the anterior wall with plate and posterior wall with screw group was little better than the both wall with plate group.