人工股骨置换术后股骨再造预测

Prediction of Femoral Remodeling After Implantation of Artifical Femoral Head

以骨截面面积吸收率和抗弯截面模量损失率反应力遮挡效应 ,采用骨再造理论和有限元 (Finite ele-ment,FEM)相结合的方法 ,用计算机模拟人工股骨植换术后股骨的再造行为 ,从而定量的分析人工股骨头对股骨的应力遮挡效应。骨表面再造采用 BRSS97程序。有限元模型采用正常股骨的受力状态为模型一 ,带颈领的人工股骨头骨水泥固定骨受力状态为模型二。结果表明 ,人工股骨头对骨产生的应力遮挡 ,股骨发生骨吸收 ,人工假体柄中段近端区域骨吸收严重。其骨截面积吸收最大 ,其截面吸收率最大为 31.33% ,抗弯截面模量损失率最大为5 4 .5 8%。

By integrating bone remodeling theory with finite element(FEM) models, the behavior of femoral remodeling after implantation of artificial femoral head was simulated and the stress shield effect of artificial femoral head on the femur was analyzed quantitatively. Bone was calculated with finite element code of the FEM model. The normal loading condition of femur was used as Model One, and the stress condition that bone was fixed by the bone cement of the artificial head with collar was used as Model Two. It has been shown that bone was stress shielded by the artificial femoral head and femur resorbed. Bone resorption near the proximal artificial stem was very severe. Its cross section resorbed the greatest. The ratio of cross sectional resorption was Ψ=31.3% and the ratio of loss of the anti bend cross sectional modulus was ζ=54.58%.