目的　运用有限元方法对镍钛记忆合金腕骨四角融合器（NTMA-FCAC）进行力学性能分析，为其临床应用提供生物力学理论依据。 方法    应用有限元方法（FEM）建立NTMA-FCAC的三维有限元模型，并根据腕关节掌屈背伸时NTMA-FCAC受力情况模拟加载，分析模型各部分的应力、应变值及分布和压缩刚度。 结果    在模拟NTMA-FCAC受力的情况下，应力集中在体臂交界处，其他部分应力分布较为均匀；NTMA-FCAC改良前、后的刚度值接近, 在一定范围内均能满足术后腕关节功能锻炼。NTMA-FCAC的刚度较强，能满足四腕骨融合的力学要求。 结论    NTMA-FCAC在体臂交界处应力较为集中容易产生疲劳，其厚度加强后能很好的应用于临床。

Objective    To evaluate biomechanical properties of NiTi shape memory alloy four-corner arthrodesis concentrator (NTMA-FCAC) by the method of finite element analysis and provide theoretical basis for it's clinical application.    Methods    With the analysis function of Ansys8.0, the models of NTMA-FCAC were built. Under the same loading condition as the arthrodesis concentrator devices encountering in fatigue test, the models were stricted and loaded. Through structure analysis, the strain/stress distributions, compression and tension stiffness were processed.    Results    The result showed that, in addition to several stress-bearing areas located in the junctional zones between body and arms, the stress distribution of other parts are even. The stiffness of two models was similar. Within the scope of certain the NTMA-FCAC can satisfy wrist functional exercise postoperatively.   Conclusions  The result shows the newly-improved NTMA- FCAC have excellent biomechanical properties. It can meet clinical application.