目的 对临床治疗中存在的骨卡环固定部位愈合不好和松动现象进行基于生物力学的解释和分析，为NiTi形状记忆合金骨卡环在骨科临床治疗上的应用提供参考和建议。方法 通过运用有限元计算软件ANSYS，建立骨科内固定器NiTi形状记忆合金骨卡环和骨组织的有限元计算模型，针对临床上较为普遍采用的骨科内固定器NiTi形状记忆合金骨卡环的生物力学性能进行数值仿真分析。结果 记忆合金骨卡环的抱持力沿骨卡环的两个半圆臂从开口处开始呈逐渐增大的趋势，在开口对称处的应力最大，同时骨骼的变形也靠近开口的对称部位。结论 在实际治疗过程中骨卡环与骨表面发生作用时，成集中力的形式表现，这对选择受力部位尤为重要。

Objective Clutching internal fixtor (CIF) loose and the fixed part weakly heal up are often found in orthopedic clinic.In the present paper, biomechanics methods were used to try to explain and analyze these issues, provide a helpful suggestion for the application of CIF in clinic. Method Commercial finite element method(FEM) Program ANSYS was applied to set up the Finite Element Models of orthopedic CIF and bone tissue to analyze and evaluate the biomechanical performances of the Ni Ti shape memory alloy CIF. Results There is an interaction force between embracing force of CIF and resistant force of bone tissue during the orthopedic clinical treatment. The embracing force along two semi-circular arms of CIF is increasing from the open position and reached the maximum value at the open symmetry position where the deformation of the bone occurre. Conclusion It is the key to choose the force loading position during the practical treatment, as the concentration force is the main force when there is an interactive force between the bone and the CIF.

国家自然科学基金资助项目(10529202．10672015)