Abstract
INTRODUCTION
Femur is one of the bones in humans that exhibit ethnic, racial, and gender difference. Several basic and clinical studies were conducted to explore these variations. Clinical anthropological studies have dealt with the compatibility of femoral prostheses and osteosythesis and materials with the femur. If there is a misalignment between the Total Knee Arthroplasy (TKA) femoral comportment installation position, Range of Motion (ROM) failure and several problems may arise. The aim of this study was to evaluate anterior bowing of the Japanese femur and to assess the adequacy of TKA femoral comportment installation position.
METHODS
We analyzed 76 normal Japanese and 97 TKA patients. (June 2014-June 2015) The average age of the normal subjects was 62.0±20.90 (24–88) years old and the average of TKA subjects was 73.6±7.9 (53–89) years old. First we defined and measured the anterior curvature and the posterior condylar offset (PCO) in normal japanese femurs. Then in TKA patients we set the implant as same angle of the component. Third, we measured the post operative anterior curvature and PCO. Then calculated the anterior curvature difference and PCO differences and preformed statistical analysis with ROM.
RESULTS SECTION
The average of anterior curvature in normal subjects was 7.87±6.60 degrees. Among 97 TKA patients, pre-operative anterior curvature was 7.58±0.16 degrees. Further, the angle of component which was set the post operatively was 7.32±0.25. The average of Anterior curvature difference and PCO differences had correlation with ROM.
DISCUSSION
Gilbert reported that caucasian femurs are straight compared to asian femurs. Chinese and Japanese showed different anterior curvature because of different life style. The chalenges are when operating on different ethnic patients, Orthopedic Surgeons consider many factors. Previous studies yielded different suggestions for the ideal point of entry. We suggest difference between the curves of the femurs should be considered for TKA femoral comportment installation position.
SIGNIFICANCE
1)Our results gave an anatomical characteristics of Japanese femur. 2)These data will give clinical indication for TKA femoral comportment installation position.
