Experimental and numerical failure analysis of Thompson hip prosthesis.

IF 1 4区 医学 Q4 ENGINEERING, BIOMEDICAL
Ali Motameni, Ömer Can Farukoğlu, Rıza Gürbüz, İhsan Korkut
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Abstract

BackgroundThere are different surgical procedures to fix femoral head-neck fractures, such as total hip arthroplasty and hemiarthroplasty. Under optimal conditions, the inserted prosthesis should last a long time, possibly a lifetime, with only trace amounts of wear each year due to the friction between the femur bone and the prosthesis stem. However, in some cases, failure due to excessive wear, creep, fatigue, corrosion, etc., can occur.ObjectiveThis study investigates the failure causes of a Thompson hip prosthesis both experimentally and numerically.MethodsThe stem of the prosthesis, which is inserted into the femur, broke inside a patient's body over time. Following the removal surgery, the severely damaged and fractured stem was examined to determine the root causes of the failure. For this purpose, fractographic examination of the fractured surfaces was conducted with scanning electron microscope (SEM). Microstructural analyses were performed using optical microscope, and the chemical composition of the prosthesis was analyzed with energy dispersive spectroscopy (EDS). Vickers hardness (HV30) test was conducted on the femoral stem. Additionally, finite element method (FEM) was applied to estimate the forces acting on the prosthesis.ResultsIt was observed that fatigue cracks initiated and propagated from the outer surface of the femoral stem at locations very close to the maximum von Mises stresses observed in the FEM analysis. However, the load magnitudes in the FEM analysis were not high enough to initiate any cracks.ConclusionIt is considered that crack initiation occurred due to material defects from the prosthesis manufacturing process, and the cyclic loading during body motion propagated these cracks. Ultimately, the fracture of the Thompson hip prosthesis occurred.

Thompson髋关节假体的实验与数值失效分析。
背景:股骨头颈骨折有不同的手术方法,如全髋关节置换术和半髋关节置换术。在最佳条件下,所插入的假体应该持续很长时间,可能是一生,由于股骨与假体干之间的摩擦,每年只有微量的磨损。然而,在某些情况下,由于过度磨损、蠕变、疲劳、腐蚀等原因,可能会发生失效。目的通过实验和数值方法探讨Thompson人工髋关节假体失效的原因。方法将假体插入股骨,随着时间的推移,假体的茎在患者体内断裂。在切除手术后,检查严重受损和断裂的茎,以确定失败的根本原因。为此,用扫描电子显微镜(SEM)对断裂表面进行了断口学检查。采用光学显微镜对假体进行显微结构分析,并用能谱仪(EDS)分析假体的化学成分。对股骨干进行维氏硬度(HV30)测试。此外,采用有限元法估算作用在假体上的力。结果观察到,疲劳裂纹从股骨干外表面开始并在非常接近FEM分析中观察到的最大von Mises应力的位置扩展。然而,在有限元分析中,荷载的大小不足以产生任何裂纹。结论认为裂纹是由假体制造过程中的材料缺陷引起的,而人体运动过程中的循环加载使裂纹扩展。最终,汤普森髋关节假体发生骨折。
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来源期刊
Bio-medical materials and engineering
Bio-medical materials and engineering 工程技术-材料科学:生物材料
CiteScore
1.80
自引率
0.00%
发文量
73
审稿时长
6 months
期刊介绍: The aim of Bio-Medical Materials and Engineering is to promote the welfare of humans and to help them keep healthy. This international journal is an interdisciplinary journal that publishes original research papers, review articles and brief notes on materials and engineering for biological and medical systems. Articles in this peer-reviewed journal cover a wide range of topics, including, but not limited to: Engineering as applied to improving diagnosis, therapy, and prevention of disease and injury, and better substitutes for damaged or disabled human organs; Studies of biomaterial interactions with the human body, bio-compatibility, interfacial and interaction problems; Biomechanical behavior under biological and/or medical conditions; Mechanical and biological properties of membrane biomaterials; Cellular and tissue engineering, physiological, biophysical, biochemical bioengineering aspects; Implant failure fields and degradation of implants. Biomimetics engineering and materials including system analysis as supporter for aged people and as rehabilitation; Bioengineering and materials technology as applied to the decontamination against environmental problems; Biosensors, bioreactors, bioprocess instrumentation and control system; Application to food engineering; Standardization problems on biomaterials and related products; Assessment of reliability and safety of biomedical materials and man-machine systems; and Product liability of biomaterials and related products.
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