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首页> 外文会议>International Conference on Fracture Fatigue and Wear >Failure Analysis of Prematurely Failed Hip Joint Implant Inside the Femur Bone
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Failure Analysis of Prematurely Failed Hip Joint Implant Inside the Femur Bone

机译：股骨骨内过早失效的髋关节植入物失效分析

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The hip joint implant once put inside the femur is expected to deliver an average life span of ～25 years. Its premature failure is highly painful to the patient as for the removal of stem cemented inside the femur; the bone at times needs to be slit for the implant removal and replacement. The visual observations of implant retrieved after failure revealed no signs of any surface wear and tear or any surface cracking even after staying inside the body for almost 10 years. The stereo microscopic examination of fractured surface revealed some serration marks apart from rough and flat regions particularly in the upper broken part of implant. Optical emission spectroscopy divulged the composition to deviate from standard SS 316L grade. The optical microstructure showed presence of almost equiaxed austenite grains. The measured hardness was 81 HRB (viz. < 1 HRC) and bend strength was 360 MPa vis-a-vis normal human bone hardness of ～20 HRC and bend strength of ～110 MPa. The implant showed no cracking even after bending at 150°. The SEM analysis revealed occurrence of many surface and sub-surface defects such as inclusions, pin hole porosities and corrosion pits. EDS mapping showed inhomogeneous distribution of chromium. The presence of fatigue failure got confirmed on revelation of features such as serration marks, cleavage and dimples. The cracks most apparently got initiated at multiple locations and progressed inside the femoral stem.
机译：预计髋关节植入物一旦放入股骨内部将提供〜25年的平均寿命。它的过早衰竭对患者的痛苦非常痛苦，因为为了除去股骨内部的茎;有时骨骼需要缝隙植入物去除和更换。在失败后检测的植入物的视觉观察显示，即使在身体内部近10年后，也没有任何表面磨损和撕裂的迹象或任何表面裂缝。裂缝表面的立体显微镜检查揭示了一些烧伤痕迹，除了粗糙和扁平区域，特别是在植入物的上部破碎部分中。光发射光谱熔化组合物以偏离标准SS 316L等级。光学微观结构显示出几乎等于奥氏体颗粒。测量的硬度为81 hRB（viz。<1 hrc），弯曲强度为360mPa Vis-Vis正常人骨硬度，〜20hrc和弯曲强度为〜110mPa。即使在150°弯曲后，植入物也没有裂缝。 SEM分析显示出发生许多表面和诸如夹杂物，销孔孔隙孔和腐蚀凹坑的诸如诸如缺陷的缺陷的发生。 EDS映射显示铬的不均匀分布。疲劳失败的存在确认在序列标记，切割和凹坑等特征的启示上确认。最明显地在多个位置发起的裂缝，并在股骨杆内进行。

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