Study on the suitability between the distal femoral form and dynamic condylar screw

Objective To discuss the suitability between the distal femoral form and dynamic condylar screw by measuring the femoral condyle form and curvature of femur. Methods In 30 male and 30 female femur specimens, the height of internal condyle, lateral condyle and fossa intercondyloidea were measured, and femoral condyle shaft angles were recorded. Then femurs of 30 normal adult volunteers were taken by X-ray to measure the angles of coronal plane. Results The height of internal condyle, lateral condyle and fossa intercondyloidea in male were significantly higher than those in female, while the femoral condyle shaft angles in female was higher (P 0.01 or P 0.05). The angles between femoral shaft and femur distal segment, and between femoral shaft and femur proximal segment were significantly different between male and female(P 0.01). After fixing femoral form specimens and DCS, there were 4 mild inappropriate and 2 obviously inappropriate cases in male, 7 and 2 cases in female, respectively. Conclusion There should be gender differences in the design of DCS, and the steel plate should be pre-buckled to suit for curvature of the femur during the operation.