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动力性加压交锁髓内钉在股骨横断骨折中的生物力学研究

, PP. 260-264

Keywords: 生物力学,动力性,交锁髓内钉,股骨,横断骨折

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Abstract:

目的通过测试动力性加压交锁髓内钉(dynamiccompressionalinterlockingnail,DCIN)在股骨横断骨折模型中手动加压及机械加压情况下的生物力学指标,对比其与静力交锁髓内钉(Staticintramedullarynail,SIN)之间的差异,探讨DCIN的生物力学特点。方法使用无骨病16根成人股骨标本制作成股骨横断骨折模型,分为两组,每组8根,分别使用史塞克公司生产的普通SIN及DCIN固定。测试两组模型在0~500N轴向载荷的手动加压过程中骨折断端应变及位移变化,再测试在500~4000N轴向载荷下骨折断端应变及位移变化。结果在手动加压过程中,DCIN的骨折模型其骨折端在轴向压缩方向上产生的应变及位移大于普通SIN(P<0.05)。两组抗弯曲能力性能基本相同,在扭转0~2.5N.m扭矩过程中,DCIN组发生扭转的角度小于SIN组(P<0.05)。在机械加压过程中,DCIN组骨折模型其轴向压缩方向产生的应变小于SIN组(P<0.05),位移则与之相反。DCIN组在机械加压过程中随着载荷增大,锁钉发生剪切变形较SIN迟。结论DCIN手动加压过程使骨折端紧密接触,提供稳定、可靠的力学传导环境,其动力化设计增加了经骨折端的应力传导,并减少了锁钉剪力。

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