目的 探讨动力髋螺钉取出后，在股骨残留钉道内植入多孔羟基磷灰石（hydroxyapatite，HA）陶瓷钉棒对于改善股骨力学性质的有效性研究。 方法 选取 1 名健康成年男性志愿者并行股骨 CT 扫描，利用 CT 数据建立正常股骨三维有限元模型，并在此基础上分别建立未填充钉棒股骨模型、填充多孔 HA 陶瓷钉棒股骨模型。根据填充多孔 HA 陶瓷的表观弹性模量和孔隙率的不同，将填充孔隙率为 80%、表观弹性模量为 0.1 GPa 的多孔 HA 陶瓷设为 A 组；填充孔隙率为 50%、表观弹性模量为 1.0 GPa 的多孔HA陶瓷设为 B 组；填充孔隙率为30%、表观弹性模量为 1.5 GPa 的多孔 HA 陶瓷设为 C 组。将成人步态周期中关节承载处于峰值时刻作为边界条件，记录 Von Mises 应力分布及应力峰值。 结果 正常股骨模型最大应力出现在股骨近端关节承重处，股骨干应力分布均匀，未出现应力集中现象。未填充钉棒股骨模型最大应力出现在远端钉道周围的骨皮质处，出现了明显的应力集中现象。B 组多孔 HA 陶瓷植入的股骨模型其应力分布与正常股骨模型应力分布最为接近，最大应力出现在关节承重处；A、C 组多孔HA陶瓷模型中均出现了不同程度的应力集中现象。 结论 在取出动力髋螺钉的股骨缺损处填充多孔 HA 陶瓷钉棒能明显改善股骨力学性质，其中孔隙率 50%、表观弹性模量 1.0 GPa 的多孔HA陶瓷钉棒最适合作为股骨的填充钉
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