Ali Motameni, Ömer Can Farukoğlu, Rıza Gürbüz, İhsan Korkut
{"title":"Thompson髋关节假体的实验与数值失效分析。","authors":"Ali Motameni, Ömer Can Farukoğlu, Rıza Gürbüz, İhsan Korkut","doi":"10.1177/09592989251353462","DOIUrl":null,"url":null,"abstract":"<p><p>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.</p>","PeriodicalId":9109,"journal":{"name":"Bio-medical materials and engineering","volume":" ","pages":"9592989251353462"},"PeriodicalIF":1.0000,"publicationDate":"2025-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Experimental and numerical failure analysis of Thompson hip prosthesis.\",\"authors\":\"Ali Motameni, Ömer Can Farukoğlu, Rıza Gürbüz, İhsan Korkut\",\"doi\":\"10.1177/09592989251353462\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p><p>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.</p>\",\"PeriodicalId\":9109,\"journal\":{\"name\":\"Bio-medical materials and engineering\",\"volume\":\" \",\"pages\":\"9592989251353462\"},\"PeriodicalIF\":1.0000,\"publicationDate\":\"2025-06-30\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Bio-medical materials and engineering\",\"FirstCategoryId\":\"5\",\"ListUrlMain\":\"https://doi.org/10.1177/09592989251353462\",\"RegionNum\":4,\"RegionCategory\":\"医学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q4\",\"JCRName\":\"ENGINEERING, BIOMEDICAL\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Bio-medical materials and engineering","FirstCategoryId":"5","ListUrlMain":"https://doi.org/10.1177/09592989251353462","RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"ENGINEERING, BIOMEDICAL","Score":null,"Total":0}
Experimental and numerical failure analysis of Thompson hip prosthesis.
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.
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.