S023015 ラグスクリューの形状と配置が骨頭部の回旋抑制性に与える影響([S02301]整形外科バイオメカニクス(1))

Abstract

Treatment of proximal femoral fractures is done mainly with femoral nails. An important part of the femoral nail is the Lag-screw. The design of the Lag-screw is known to have significant influence on the rotation of the femoral head. However, the conventional Lag-screw is unable to sufficiently inhibit the rotation of the femoral head. Redesign of the Lag-screw is suggested to resolve this problem. In this study, we propose the design of the Rectangle Double Lag-screw system. In this paper, to examine the validity of our design, we performed torsion tests and an FEM analysis. Results of the comparison of the Rectangle Double Lag-screw system with the conventional Lag-screw system in torsion test and FEM analysis, indicated the validity of our design for inhibiting the rotation of the femoral head.