The total hip arthroplasty (THA) is considered as one of the most successful orthopedic surgeries, through which the damaged hip joint is replaced with hip joint prosthesis. Besides, automatic nano-finishing of femoral head is of great importance in improving tribological, biological, and metallurgical properties of hip joint implants and increases the productivity of manufacturing process. In the present effort, to satisfy these requirements, a new inverse replica fixture of femoral head has been proposed in the abrasive flow finishing (AFF) process. In addition, the effect of AFF parameters including extrusion pressure, number of finishing cycles, and abrasive mesh size has been investigated on the surface roughness of the femoral head which is made of ASTM F 138 (SS 316 L). For conducting the experimental tests, a setup of AFF process is designed and fabricated. The experiments are performed according to the design of experiments and the full factorial method. Statistical analysis of the experimental data shows that the most significant parameter is the abrasive mesh size. Moreover, the surface topographic parameters of R_a, R_q, R_p, R_v, and R_t of femoral head under experimental conditions; extrusion pressure of 9 MPa, number of finishing cycles of 100, and abrasive mesh size of 1000 have improved by 91.71%, 91.21%, 81.84%, 88.46%, and 85.44%, respectively. Furthermore, SEM and AFM images of the surface texture of the femoral head before and after the AFF process demonstrate the elimination of CNC lathe traces along with achieving mirror-like surface up to the range of 20.3 nm. In addition, regarding the XRF results, no considerable variation in the chemical composition of femoral head before and after the AFF process is observed.

全髋关节置换术（THA）被认为是最成功的骨科手术之一，通过这种手术，受损的髋关节被替换为髋关节假体。此外，股骨头的自动纳米修整对于改善髋关节植入物的摩擦学，生物学和冶金学特性以及提高制造过程的生产率具有重要意义。在目前的努力中，为了满足这些要求，已经在磨料流整饰（AFF）工艺中提出了一种新的股骨头反向复制固定器。另外，已经研究了包括挤出压力，精加工循环次数和磨料筛孔尺寸在内的AFF参数对由ASTM F 138（SS 316 L）制成的股骨头表面粗糙度的影响。为了进行实验测试，设计并制造了一套AFF工艺。根据实验设计和完全析因法进行实验。实验数据的统计分析表明，最重要的参数是磨料筛孔尺寸。而且，表面形貌参数在实验条件下股骨头的R _a，R _q，R _p，R _v和R _t；挤压压力为9 MPa，精加工循环数为100，磨料筛网尺寸为1000，分别提高了91.71％，91.21％，81.84％，88.46％和85.44％。此外，在AFF加工前后，股骨头表面纹理的SEM和AFM图像显示，消除了CNC车床痕迹，并获得了高达20.3 nm的镜面状表面。另外，关于XRF结果，在AFF过程之前和之后，股骨头的化学组成没有明显变化。