【摘要】 建立同种异体骨与人工关节复合移植重建股骨近段大段骨缺损骨临床愈合期的三维有限元模型,设定股骨近段骨缺损长度为135mm,假体柄植入宿主股骨髓腔内长度为138mm,首先采用efilm软件对股骨CT扫描图像进行三维重建,将重建数据及测量的假体参数导入ProeWildfire3.0软件建立三维实体模型,而后在AN-SYS11.0中建立三维有限元模型,以下肢稳态步行的峰值负荷生理加载,得出载荷对股骨、骨痂、骨水泥及假体应力分布的影响。股骨应力值在假体柄尖端内侧处达到最大值,骨水泥壳应力最大值位于假体柄尖端骨水泥壳内侧,假体应力最大值位于假体柄尖端近端4cm处内侧,骨痂内侧应力值最大,各模型最大应力值均低于其疲劳强度。对于本模型骨临床愈合期适宜下肢稳态步行。更多还原

【Abstract】 Three-dimensional finite element models of the large defect of proximal femur were reconstructed with allograft prosthesis composite in clinical bone-healing phase;current model was under the given conditions of 138mm-intramedullary stem-length of host bone and 135mm defect-length of proximal femur. The femur was constructed with efilm software from CT data,then three-dimensional concrete models were created by using Proe-Wildfire software;the three-dimensional finite element models of allograft prosthesis composite were made in ANSYS11 software. Loads were simulated using the peaking values during stance walking. The stress on femur-cement-callus-prostheses and the influence of stress on the clinical bone-healing phase were analysed.The highest stress value of femur is on the medial side of the tip of the prostheses. The highest stress value of cement mantle is on the medical side of the cement mantle at the tip of the stem. The highest stress value of the prostheses is on the medial side near the upper 4cm of the stem tip. The highest stress value on the callus is at the medial side of the callus layer. The highest stress value on every part is under the corresponding fatigue strength. Clinical bone-healing phase model is well enough for stance walking.更多还原