The total hip replacement is an operation that replaces a diseased hip with a mechanical articulation. Both components of the mechanical articulation (stem and the cup) are bonded to bone using orthopedic cement, whose reliability determines the longevity of the implant. The cement around the metallic stem forms a mantle whose strength and toughness determine its resistance to fatigue and failure by fracture. Typical cements are acrylic polymers that often suffer from internal cracks and other defects created during polymerization. This study is a systematic analysis of preexisting 3D crack behavior in the orthopedic cement mantle when subjected to external body forces. Different crack orientations and angular positions around the mantle are studied to identify which locations will propagate the crack. This is accomplished by a global stress analysis of the mantle followed by a failure analysis. Amongst others, the existence of a crack in the proximal region of the orthopedic cement is identified as a critical area, especially in the lateral sides of the stem in the radial direction.

中文翻译：

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全髋关节置换的整形外科水泥地幔中的3D裂纹行为

全髋关节置换术是用机械关节置换患病髋关节的手术。机械关节的两个组件（柄和杯）都使用矫形骨水泥粘结到骨骼，其可靠性决定了植入物的寿命。金属杆周围的水泥形成地幔，其强度和韧性决定了其抗疲劳和断裂的能力。典型的水泥是丙烯酸聚合物，其经常遭受内部裂缝和在聚合过程中产生的其他缺陷。这项研究是对骨科水泥地幔在受到外力作用时预先存在的3D裂纹行为的系统分析。研究了围绕地幔的不同裂缝方向和角度位置，以确定哪些位置会传播裂缝。这是通过对地幔进行整体应力分析，然后进行破坏分析来完成的。除其他外，在整形外科水泥的近端区域中的裂缝的存在被认为是关键区域，尤其是在径向方向上在茎的侧面中。