A study on morphometric features of the distal femoral resected surface in the osteoarthritis knees of Chinese patients and the differences in Males and Females.

Abstract Purpose To measure the morphometric features of the distal femoral resected surface in the osteoarthritis knees of Chinese patients and to analyze the morphometric variation of the distal femoral resected surface. Method The computer tomography (CT) images of a total of 406 knees from 203 osteoarthritis patients who underwent total knee arthroplasty (TKA) from January 2018 to December 2021 were analyzed. These imaging data were imported into the software of Mimics 21.0 and the three-dimensional (3D) model of the femur was reconstructed. When the distal femoral bone resection was simulated in this software, the measurement of medial-lateral (ML) dimension and anterior-posterior (AP) dimension of the resected surface was performed in the software. We analyzed the differences of AP dimension, ML dimension, and aspect ratio (ML/AP) between females and males. Result The mean ML dimension, the mean AP dimension, and the mean AR value measured in Chinese knees were 66.36 ± 4.61 mm, 58.39 ± 3.81 mm, and 1.14 ± 0.07 respectively. An obvious inter-individual morphometric variation of the distal femoral resected surface was observed between males and females. The data of the dimensions for Males are significantly larger than that for females, including the calculated values of AR. The results showed that the distal femoral resected surface of female seemed to be “narrower” than that of male. Conclusion The morphology of the distal femoral resected surface in Chinese patients with osteoarthritis shows great interpersonal variability, with men showing significantly higher values than women. Our results could provide a reference for the design of the prosthesis best fit for Chinese.