Anthropometric Measurements of Distal Femur to Design the Femoral Component of Total Knee Arthroplasty for the Iranian Population

Acquiring knowledge about anatomic and geometric quantities of bones is among the most vitalparameters in orthopedic surgery that has a significant effect on the treatment of various disorders and subsequentoutcomes. The aim of this study was to obtain anthropometric information for distal femur in order to compare withsimilar dimensions of prosthesis used in total knee arthroplasty (TKA) surgery and to design more suitable and optimalcomponents. Morphological data of distal femur were measured in 132 knees (81 males and 51 females) using magneticresonance imaging (MRI). The data included anterior-posterior (AP) length, medial-lateral (ML) width, medial AP (MAP),lateral AP (LAP), MAP to LAP distance in the anterior distal femur namely anterior medial lateral (AML) width, medialand lateral condyle width, and intercondylar notch. The aspect ratio (ML/AP) was also calculated and the results werecompared with similar dimensions of currently used knee implants. Our data showed that men are significantly larger in all dimensions than women. In the distal femur withsimilar AP lengths in both sexes, women had a smaller ML width than men (P<0.001). Comparison between the distalfemur and studied prostheses showed no high correlation and similarity between the femoral component and femoralcondyle prostheses in the resected surface of the bone. The results of this study can provide the data needed to design prostheses suitable for the Iranianpopulation.Level of evidence: III