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[目的]通过生物力学实验应力分析,论证头颈钉不同置放位置的生物力学性能,固定牢固,有利于骨折愈合以指导临床手术.[方法]采集24具新鲜股骨标本,分别造成股骨粗隆间稳定和不稳定骨折,用r钉、DHS固定,头颈钉分别置放不同位置,测定股骨抗压、抗弯、抗剪和抗扭等力学性能,分析比较不同位置头颈钉内固定的优劣.[结果]从股骨强度、刚度、稳定性和承载能力测试结果表明,对于稳定型股骨粗隆间骨折,头颈钉应放在股骨头颈中下1/3偏后处,骨质敛密,有股骨距支撑,承载能力大为增强,有利于早期下床活动且不易发生切割;对于不稳定型股骨粗隆间骨折,头颈钉应放入股骨头颈中间 学测试,确认股骨近端骨折头颈钉最佳固定位置,是提高现代器械临床固定效果,提高股骨近端骨折手术疗效的关键.“,”[Objective]To analyze the biomechanies of different positions of femoral head-and-neck nail in fixation of proxi-mal femoral fracture. [Method]Stable and unstable fracture models were made from 24 fresh femur specimens, and fixed with r-nail and DHS. Head-and-neck nails were placed in different positions to test their mechanical properties of anti-compression, an-ti-bending, anti-sheafing and anti-torsion, and compared with each other. [Result]Mechanical properties of the femoral strength, stiffness, stability and loading capacity were tested and compared. To the stable fracture group, head-and-neck nail should be placed in middle-lower and posterior 1/3 of femoral neck, which leads to the best loading capacity. To the unstable fracture group, it should be placed between femoral head and neck, which lead to strong obliquity mechanics and valuable for bone u-nion. [Conclusion]Confirm of the best position of femoral head-and-neck nail could improve the effect of fixation and enhance the surgical treatment of proximal femoral fracture.