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-  2015 

四种内固定方法治疗髋臼方形区骨折的生物力学比较研究

DOI: doi:10.7507/1002-1892.20150268

Keywords: 髋臼方形区骨折, 内固定, 重建接骨板, 拉力螺钉, 生物力学

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Abstract:

目的比较髋臼方形区骨折4种内固定方法的生物力学差异。 方法取8具16个成年男性半骨盆标本,制作髋臼横形骨折模型,根据内固定方法不同随机分成4组(n=4),分别行骨盆缘下重建接骨板内固定(A组)、骨盆缘下锁定重建接骨板内固定(B组)、前柱重建接骨板结合方形区螺钉内固定(C组)、前柱重建接骨板加后柱拉力螺钉内固定(D组)。通过对骨折模型进行连续垂直加载,测试骨折水平位移、纵向位移,计算轴向刚度,比较各组内固定方式的稳定性。 结果同一载荷下,A、B、C、D组水平、纵向位移均逐渐减小,其中加载至1 800 N时A组纵向位移>3.00 mm,达到失效标准;而轴向刚度则逐渐增大。加载至200 N时各组水平、纵向位移及轴向刚度比较,差异均无统计学意义(P>0.05);600~1 800 N时,除C、D组间水平位移差异无统计学意义(P>0.05)外,其余各组水平、纵向位移及轴向刚度比较,差异均有统计学意义(P<0.05)。 结论采用前柱重建接骨板加后柱拉力螺钉内固定髋臼方形骨折稳定性最高,其次为前柱重建接骨板结合方形区螺钉内固定,均优于骨盆缘下锁定重建接骨板和重建接骨板内固定

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