目的：对3种双板法坚固内固定髁突矢状骨折（SFMC）行生物力学分析。方法：构建 SFMC 双直板（SS）、一直一 L 板（SL）、双 L 板（LL）坚固内固定三维有限元模型，对比其生物力学因素。结果：SS 固定的髁突残端最大等效应力（MES）、最大总位移（MTD）和最大总转角（MTC）分别为525．475 MPa、0．9022 mm、0．2601°；游离端为4．425 MPa、0．8827 mm、0．0199°。SL 固定的髁突残端为1135 MPa、0．9367 mm、0．1261°；游离端为2．656 MPa、0．8871 mm、0．0169°。LL 固定的髁突残端为2208 MPa、0．9238 mm、0．1722°；游离端为14．668 MPa、0．8766 mm、0．0181°。结论：双 L 板生物力学分布方式合理。%Objective:To analyze the biomechanical stress distribution on the sagittal fractured of the mandibular condyle(SFMC) fixed by double plates in 3 different ways.Methods:The fixation finite element models with double straight plates(SS),one straight and one L-form plates(SL),and double L-form plates(LL)were established.The biomechanical stresses on condyle were calculated with finite element analysis.Results:In the model of SS fixation the maximum equivalent stress (MES),maximum total displacement (MTD)and maximum total corner(MTC)of condylar stump were 525.475 MPa,0.902 2 mm and 0.260 1°;MES,MTD,and MTC on fractured free-end were 4.425 MPa,0.882 7 mm and 0.019 9°,respectively.In the model of SL fixation MES,MTD and MTC on condylar stump were 1 135 MPa,0.9367 mm and 0.126 1°;MES,MTD and MTC on fractured free-end were 2.656 MPa,0.887 1 mm and 0.016 9°,respectively.In the model of LL fixation MES,MTD and MTC on condylar stump were 2 208 MPa,0.923 8 mm and 0.172 2°;MES,MTD and MTC on fractured free-end were 14.66 8 MPa,0.876 6 mm and 0.018 1°,respectively.Conclusion:Double L plates fixation is a proper way for SFMC.
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