【摘要】 目的为临床上选择合理的内固定器材提供理论依据。方法取16具成年(男女各半)新鲜股骨标本随机分成四种,制成股骨颈骨折,分别植入三枚加压螺纹钉、单一空心加压螺钉、三刃钉及三根骨圆针,逐一进行生物力学测试。结果三枚加压螺纹钉的刚度和强度最大,单一空心加压螺钉次之,三刃钉较差(P<0.01)。同时,发现三枚加压螺纹钉具有较强的抗剪力、弯应力及抗扭力。结论三枚加压螺纹钉呈三角形立体植入股骨颈内,符合生物力学规律。更多还原

【Abstract】 to provide theoretic basis for rational choosinhg of internal fixation in clinical use through biomechanical experiment and comparative anaiysis of femoral samples after internal fixation. Methods Sixteen eases of femoral neck frncture which were produced from adult fresh femoral samples were divid-ed into four groups at random, after different internal fixationst three-compression-screws single-hollow-compression-sercw trifim neil and three steinmamm’s pins)were used separately for the fracture biomech-nical measurements were respectively made in the salples. Results Biomechanical measurements showed that among these four fixations three-compressiojn-screws was the best in rigidity and strength, single-hollow-compressionscrew was the second and trifin nail was poor (P<0.01). and that three-compression-screws had better anti-shearing stress, bdnding strength and anti-torsional force. Conclusion The au-thors believe that three-compression-screws, which fix femoral neck in the shape of triangle, accord with biomechanics, have dynamic and static compression effect and make the fracture fragments contacted clos- er.更多还原