摘要
目的 :建立全髋关节置换术后股骨的有限元模型 ,探讨应力变化的特点、规律 ,为临床应用提供参考。方法 :用有限元计算法对不同设计的人工全髋关节假体在骨内应力分布规律进行分析。结果 :①正常股骨压应力主要分布在股骨内侧面 ,有托式无骨水泥型人工假体压应力主要分布在人工假体柄与股骨内侧皮质的交界面 ,有骨水泥型人工假体主要分布在骨水泥与假体交界面上。②有托式无骨水泥型在股骨内侧皮质应力比有骨水泥型小。③假体长度增加 ,假体末端应力略有减少。结论 :人工关节置换术后较正常股骨应力发生改变 ,骨水泥对应有缓冲作用 。
Objective:To analyze the femoral stress distr i bution changes after total hip replacement mechanically, and to provide a theore tical foundation for the clinical practice Methods: Using the Sap84 finite element program, 3 kinds of models were analyzed Model A is norma l femur, Model B is cementless prosthesis with supporting collar, and Model C is cemented prosthesis without collar Both Model B and Model C have 3 different stem lengths Results:1 The stress distribution of normal fem ur is mainly in the internal aspect of the medial cortical femur, cementless pro sthesis with collar is in the interface between the stem of the prosthesis and m edial cortical femur, whereas in the cemented prosthesis without collar, the dis tribution of stress mainly locates in the interface between cement and prosthesi s; 2 Stress on the cemented prosthesis with collar is less than that on the ce mented prosthesis without collar 3 Stress decreases slightly on the tip of t he prosthesis as the length of prosthesis increases Conclusion: Stress on the femur changes after artificial hip replacement, cement has buffe r effect on the distribution of stress in the femur Increased prosthetic lengt h can′t reduce the stress significantly
出处
《军医进修学院学报》
CAS
2003年第2期155-157,共3页
Academic Journal of Pla Postgraduate Medical School
