研究了基于数字化3D技术的全膝置换股骨假体再设计并通过激光选区熔化(SLM) 技术直接制造了股骨假体, 以满足医学上对全膝置换股骨假体的高适配性要求。对一名患者的全膝关节CT连续断层图像提取股骨3D模型，根据骨科医生手术规划进行了数字化3D解剖与测量，并据此对目前商业化的假体进行了重新设计。然后，利用SLM技术直接制造了再设计完成的3D股骨假体模型，并讨论了制造工艺参数、机械性能、空间优化摆放位置以及成型精度等关键技术。实验结果显示：依据患者股骨远端解剖参数可完成股骨假体的3D模型再设计并可利用SLM技术直接制造出股骨假体，单个股骨假体成型时间为5.2 h，成型精度标准偏差为0.030 mm，成型致密度达到99.02%；热处理后成型性能优于美国实验材料学会(ASTM) F75的铸造标准。得到的结果表明该项技术可以快速制造完成患者所需要的股骨假体，且成型性能优良。

The redesign of femoral components for total knee arthroplasty on the basis of digital 3D technology was researched and a femoral component was manufactured by Selective Laser Melting(SLM) technology to meet the demand of high suitability for the total knee arthroplasty in medicine. The 3D femoral model was extracted from the CT consecutive tomographic images of total knee on a patient. The digital 3D anatomy and measurement were performed based on the orthopedist′s operation plan, through which the current commercial component was redesigned. Then, the 3D femoral component after redesign was directly manufactured by SLM technology and the key technologies were discussed, such as process parameters, mechanical properties, spatial position optimization and manufacturing accuracy.Experimental results show that redesigning the 3D model of the femoral component is implemented according to anatomical parameters of the patient′s distal femur and the femoral component is manufactured directly by the SLM.The experiments show the manufacturing time of a single femoral component is 5.2 h, the standard deviation of manufacturing precision is 0.030 mm, and the relative density reaches 99.02%, which are all superior to those of casting standard of ASTM F75( American Society for Test Material). It concludes that the redesign and manufacturing methods based on digital 3D technology are good ways to redesign and manufacture excellent femoral components rapidly and meets the demands of the patients.