Abstract: Objective    To measure the position parameters of the prosthesis after hip arthroplasty in Inner Mongolia, and to understand the position distribution and anatomical reconstruction rate of the prosthesis in Inner Mongolia.   Methods   The X-ray data of  hip arthroplasty were collected from four tertiary hospitals in Inner Mongolia, aged 30-70 years, and 179 cases were finally. The image data was imported into the Mimics 21.0 software in JEPG format measured by multiple people’s repeated measurements and taking the average value, including acetabular prosthesis abduction angle, anteversion angle, hip rotation center position (vertical position, horizontal position), femoral offset, and leg length discrepancy, and the differences in the center of rotation of the hip joint and femoral offset between the operated side and the healthy side were compared, and the anatomical reconstruction rates of the above 6 parameters were counted.    Results   (1) The inter-observer and intra-observer correlation coefficients ranged from 0.84 to 0.99, showing good reliability. (2) There was no statistically significant difference in the femoral offset on the healthy side and the operated side, but there were statistically significant differences in the vertical position and horizontal position of the hip joint rotation center between the operated side and the healthy side (P<0.05), and compared with the healthy side, the center of rotation of the prosthesis on the operated side is shifted inwardly and upwardly. (3) The anatomical reconstruction rates of acetabular prosthesis abduction angle, anteversion angle, hip joint rotation center vertical position, horizontal position, femoral offset, and the leg length discrepancy were 79.90%, 77.70%, 43.02%, and 60.34%, 60.30%, 79.30%, respectively.   Conclusions   This study understands the distribution of prosthetic positions in hip arthroplasty in Inner Mongolia. It is difficult to achieve completely anatomical reconstruction after surgery. Among them, the anatomical reconstruction rate of the vertical position, horizontal position of the hip joint rotation center and femoral offset is low. Surgical methods need to be continuously improved to further narrow the difference between the two sides.

Key words: Hip arthroplasty,  ,  , X-ray,  ,  ,  , Prosthesis,  ,  ,  , Anatomical reconstruction