Pub Date : 2012-10-16DOI: 10.1504/IJECB.2012.049808
D. Hughes
Until recently the accurate measurement of contact loads acting in the glenohumeral joint have been difficult to calculate and define. Now, contact forces and moments are measured in vivo using telemeterised shoulder implants. This method limits testing opportunities so a dynamic shoulder testing apparatus has been developed to examine glenohumeral joint motion and forces. This in vitro study evaluated the accuracy of forces generated in the glenohumeral joint using an instrumented prosthetic implant. Forces were applied to cables to simulate loading of the supraspinatus, subscapularis, infraspinatus/teres minor, long head biceps and anterior, middle, and posterior deltoid muscles. The test rig reproduces the 6DoF of the glenohumeral joint and accurately recreates the contact forces measured in vivo. This test rig will allow many more tests to be simulated including comparison of fixation methods and high impact injuries.
{"title":"The development of an in vitro glenohumeral testing rig","authors":"D. Hughes","doi":"10.1504/IJECB.2012.049808","DOIUrl":"https://doi.org/10.1504/IJECB.2012.049808","url":null,"abstract":"Until recently the accurate measurement of contact loads acting in the glenohumeral joint have been difficult to calculate and define. Now, contact forces and moments are measured in vivo using telemeterised shoulder implants. This method limits testing opportunities so a dynamic shoulder testing apparatus has been developed to examine glenohumeral joint motion and forces. This in vitro study evaluated the accuracy of forces generated in the glenohumeral joint using an instrumented prosthetic implant. Forces were applied to cables to simulate loading of the supraspinatus, subscapularis, infraspinatus/teres minor, long head biceps and anterior, middle, and posterior deltoid muscles. \u0000 \u0000The test rig reproduces the 6DoF of the glenohumeral joint and accurately recreates the contact forces measured in vivo. This test rig will allow many more tests to be simulated including comparison of fixation methods and high impact injuries.","PeriodicalId":90184,"journal":{"name":"International journal of experimental and computational biomechanics","volume":"49 1","pages":"96"},"PeriodicalIF":0.0,"publicationDate":"2012-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1504/IJECB.2012.049808","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66744894","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2012-10-16DOI: 10.1504/IJECB.2012.049803
K. Firoozbakhsh, M. Ahmadian, M. Rahaeifard, M. Kahrobaiyan
Atomic force microscopes (AFM) are devices used for surface roughness detection. A novel AFM device composed of a tip attached to a cantilever beam is proposed for precise soft-tissue-inflammation detection. It is assumed that the beam is made of functionally graded materials (FGMs) with properties varying throughout the thickness. Two low resonant frequencies and the sensitivities of the AFM cantilever are studied. A relationship is developed to evaluate the sensitivity of a FGM micro-cantilever beam. The effects of mass distributions of material constituents, surface contact stiffness, and geometric parameters on the resonant frequencies and sensitivities are studied. The high sensitivity of such device to the stiffness of the contact surface is proposed to be the recognition key for soft tissue inflammation.
{"title":"A novel device for detection of soft tissue inflammation: dynamic behaviour of a functionally graded AFM cantilever","authors":"K. Firoozbakhsh, M. Ahmadian, M. Rahaeifard, M. Kahrobaiyan","doi":"10.1504/IJECB.2012.049803","DOIUrl":"https://doi.org/10.1504/IJECB.2012.049803","url":null,"abstract":"Atomic force microscopes (AFM) are devices used for surface roughness detection. A novel AFM device composed of a tip attached to a cantilever beam is proposed for precise soft-tissue-inflammation detection. It is assumed that the beam is made of functionally graded materials (FGMs) with properties varying throughout the thickness. Two low resonant frequencies and the sensitivities of the AFM cantilever are studied. A relationship is developed to evaluate the sensitivity of a FGM micro-cantilever beam. The effects of mass distributions of material constituents, surface contact stiffness, and geometric parameters on the resonant frequencies and sensitivities are studied. The high sensitivity of such device to the stiffness of the contact surface is proposed to be the recognition key for soft tissue inflammation.","PeriodicalId":90184,"journal":{"name":"International journal of experimental and computational biomechanics","volume":"2 1","pages":"1"},"PeriodicalIF":0.0,"publicationDate":"2012-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1504/IJECB.2012.049803","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66744837","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2012-10-16DOI: 10.1504/IJECB.2012.049802
D. K. Dubey, V. Tomar
Osteogenesis imperfecta (OI) is a genetic disease marked by extreme bone fragility and is associated with mutations in tropocollagen (TC) molecule and changes in hydroxyapatite (HAP) mineral texture. Mutations in TC can manifest in both ways, substitution of polypeptide chains and point mutations of residues. This study presents a mechanistic view on the effects of OI mutations in TC on strength of model TC-HAP biomaterials with two different mineral distributions using three dimensional atomistic simulations. Analysis points out that substitution of residue sequences with higher number of side chain functional groups impart higher strength to the TC-HAP biomaterials. Results show that the effect of TC point mutations on the strength of TC-HAP biomaterials is insignificant. Instead, change in mineral distribution showed significant impact on the overall strength of TC-HAP biomaterials. Overall, study suggests that TC mutations manifest themselves by altering the mineral distribution during hydroxyapatite ...
{"title":"An atomistic investigation into the molecular effects of osteogenesis imperfecta like genetic mutations on biomaterial strength","authors":"D. K. Dubey, V. Tomar","doi":"10.1504/IJECB.2012.049802","DOIUrl":"https://doi.org/10.1504/IJECB.2012.049802","url":null,"abstract":"Osteogenesis imperfecta (OI) is a genetic disease marked by extreme bone fragility and is associated with mutations in tropocollagen (TC) molecule and changes in hydroxyapatite (HAP) mineral texture. Mutations in TC can manifest in both ways, substitution of polypeptide chains and point mutations of residues. This study presents a mechanistic view on the effects of OI mutations in TC on strength of model TC-HAP biomaterials with two different mineral distributions using three dimensional atomistic simulations. Analysis points out that substitution of residue sequences with higher number of side chain functional groups impart higher strength to the TC-HAP biomaterials. Results show that the effect of TC point mutations on the strength of TC-HAP biomaterials is insignificant. Instead, change in mineral distribution showed significant impact on the overall strength of TC-HAP biomaterials. Overall, study suggests that TC mutations manifest themselves by altering the mineral distribution during hydroxyapatite ...","PeriodicalId":90184,"journal":{"name":"International journal of experimental and computational biomechanics","volume":"2 1","pages":"10"},"PeriodicalIF":0.0,"publicationDate":"2012-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1504/IJECB.2012.049802","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66744826","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2012-10-16DOI: 10.1504/IJECB.2012.049807
S. Mari, E. Pennestrì, Martina Trebbi, F. Nappi, D. Rughi
This investigation has the purpose of developing and cross-validating algorithms and software tools for quantitative ergonomic analyses of workers movements. In particular, the results from a skeletal inverse dynamics model are directly compared with those obtained from a muscular model herein proposed. Both models rely upon experimentally gathered kinematic and electromyography data. The 2D skeletal model is based on a multibody dynamics formulation. The software implementation can perform both kinematic and inverse dynamic analyses. Kinematic input data required by the model have been collected using an optoelectronic human motion capture system. The kinematics of the model has been compared with experimentally collected data. The muscular electromyography (EMG)-assisted model discussed is particularly suitable for biarticular muscles. Joint torques, muscular forces and powers can be also estimated. The inputs required by this model have been collected recording surface electromyographic signals and using some kinematic output from the skeletal model. The results from mathematical models have been compared for cross-validation, and their adequacy for ergonomy analyses assessed.
{"title":"A comparison between inverse dynamics skeletal and muscular models","authors":"S. Mari, E. Pennestrì, Martina Trebbi, F. Nappi, D. Rughi","doi":"10.1504/IJECB.2012.049807","DOIUrl":"https://doi.org/10.1504/IJECB.2012.049807","url":null,"abstract":"This investigation has the purpose of developing and cross-validating algorithms and software tools for quantitative ergonomic analyses of workers movements. In particular, the results from a skeletal inverse dynamics model are directly compared with those obtained from a muscular model herein proposed. Both models rely upon experimentally gathered kinematic and electromyography data. \u0000 \u0000The 2D skeletal model is based on a multibody dynamics formulation. The software implementation can perform both kinematic and inverse dynamic analyses. Kinematic input data required by the model have been collected using an optoelectronic human motion capture system. The kinematics of the model has been compared with experimentally collected data. \u0000 \u0000The muscular electromyography (EMG)-assisted model discussed is particularly suitable for biarticular muscles. Joint torques, muscular forces and powers can be also estimated. The inputs required by this model have been collected recording surface electromyographic signals and using some kinematic output from the skeletal model. The results from mathematical models have been compared for cross-validation, and their adequacy for ergonomy analyses assessed.","PeriodicalId":90184,"journal":{"name":"International journal of experimental and computational biomechanics","volume":"2 1","pages":"74"},"PeriodicalIF":0.0,"publicationDate":"2012-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1504/IJECB.2012.049807","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66744884","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2011-05-09DOI: 10.1504/IJECB.2011.039945
P. Prokopow, K. Pomorski
The aim of this study was to quantify the importance of biarticular muscles on vertical squat jump. In order to do that, we used a neuromusculoskeletal model and a forward dynamics computer simulation. In separate trials biarticular muscles were removed from the neuromusculoskeletal model, firstly only one muscle was removed each trial, and then all three biarticular muscles were removed together in one more trial. Investigated were three main groups of biarticular muscles of lower extremities: m. rectus femoris, hamstrings and m. gastrocemius. The results demonstrated that monoarticular muscles are primary producers of the force used to accelerate the body’s centre of gravity vertically. While the function of biarticular muscles is twofold: Therefore, we conclude that the most important function of biarticular muscles in a vertical jump is to help to coordinate jump movement and increase the effectiveness of the usage of muscle force to accelerate vertically the body’s centre of gravity.
{"title":"Simulation study of the importance of biarticular muscles on human vertical jump performance","authors":"P. Prokopow, K. Pomorski","doi":"10.1504/IJECB.2011.039945","DOIUrl":"https://doi.org/10.1504/IJECB.2011.039945","url":null,"abstract":"The aim of this study was to quantify the importance of biarticular muscles on vertical squat jump. In order to do that, we used a neuromusculoskeletal model and a forward dynamics computer simulation. In separate trials biarticular muscles were removed from the neuromusculoskeletal model, firstly only one muscle was removed each trial, and then all three biarticular muscles were removed together in one more trial. Investigated were three main groups of biarticular muscles of lower extremities: m. rectus femoris, hamstrings and m. gastrocemius. The results demonstrated that monoarticular muscles are primary producers of the force used to accelerate the body’s centre of gravity vertically. While the function of biarticular muscles is twofold: \u0000 \u0000Therefore, we conclude that the most important function of biarticular muscles in a vertical jump is to help to coordinate jump movement and increase the effectiveness of the usage of muscle force to accelerate vertically the body’s centre of gravity.","PeriodicalId":90184,"journal":{"name":"International journal of experimental and computational biomechanics","volume":"1 1","pages":"333"},"PeriodicalIF":0.0,"publicationDate":"2011-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1504/IJECB.2011.039945","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66744431","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2011-05-09DOI: 10.1504/IJECB.2011.039948
A. Schonning, Carmen Masnita Iusan, M. Rawls, M. Straatsma, P. Wludyka, M. Patney, J. R. Cotton
The effect of vacuum mixer brand is studied on six commercial bone cements, three with prophylactic doses of antibiotics and three without. The modulus of elasticity, ultimate tensile strength, maximum strain, and 0.2% yield strength was analysed. Bone cement specimens were manufactured and tested in accordance with ASTM D638 specifications using three different types of vacuum mixers in an operating room. The specimens were tested in a universal testing machine. Statistical analysis revealed that a proprietary mixer did not generally outperform the other two mixers for its own cement. It was found that the mixer had a significant effect on the results and that the Stryker/Simplex mixer generally outperformed Biomet and Zimmer. However, for the Simplex bone cement, the mixer type did not have a significant effect for most of the data analysed. The overall conclusion is that the proprietary mixer does not perform the best with its own cement.
{"title":"Effect of vacuum mixer brand on tensile properties of acrylic bone cement","authors":"A. Schonning, Carmen Masnita Iusan, M. Rawls, M. Straatsma, P. Wludyka, M. Patney, J. R. Cotton","doi":"10.1504/IJECB.2011.039948","DOIUrl":"https://doi.org/10.1504/IJECB.2011.039948","url":null,"abstract":"The effect of vacuum mixer brand is studied on six commercial bone cements, three with prophylactic doses of antibiotics and three without. The modulus of elasticity, ultimate tensile strength, maximum strain, and 0.2% yield strength was analysed. Bone cement specimens were manufactured and tested in accordance with ASTM D638 specifications using three different types of vacuum mixers in an operating room. The specimens were tested in a universal testing machine. Statistical analysis revealed that a proprietary mixer did not generally outperform the other two mixers for its own cement. It was found that the mixer had a significant effect on the results and that the Stryker/Simplex mixer generally outperformed Biomet and Zimmer. However, for the Simplex bone cement, the mixer type did not have a significant effect for most of the data analysed. The overall conclusion is that the proprietary mixer does not perform the best with its own cement.","PeriodicalId":90184,"journal":{"name":"International journal of experimental and computational biomechanics","volume":"1 1","pages":"381"},"PeriodicalIF":0.0,"publicationDate":"2011-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1504/IJECB.2011.039948","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66744986","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2011-05-09DOI: 10.1504/IJECB.2011.039947
S. Murillo, M. Pattichis, E. Barriga
Non-invasive ultrasound imaging of carotid plaques is used in routine clinical evaluation of atherosclerosis and stroke. Strain imaging of the atherosclerotic plaques represents a very promising, emerging application of ultrasound imaging because it can assess plaque vulnerability without the risks of intervention. The promise of strain imaging includes the development of advanced diagnostic tools that can be used to predict plaque rupture. This review paper presents the fundamental assumptions and methods that can be used to extract motion estimates from ultrasound images. In terms of assumptions, both the constant and non-constant brightness models are presented. The most commonly used energy functionals are presented, along with both local and global solutions. Motion and strain imaging examples are also provided to demonstrate the methods. Our goal is that this review will facilitate the development of new, reliable strain imaging methods that can be used to assess the risk of plaque rupture.
{"title":"A review of motion estimation methods for non-invasive ultrasound motion and emerging strain imaging methods of carotid artery plaques","authors":"S. Murillo, M. Pattichis, E. Barriga","doi":"10.1504/IJECB.2011.039947","DOIUrl":"https://doi.org/10.1504/IJECB.2011.039947","url":null,"abstract":"Non-invasive ultrasound imaging of carotid plaques is used in routine clinical evaluation of atherosclerosis and stroke. Strain imaging of the atherosclerotic plaques represents a very promising, emerging application of ultrasound imaging because it can assess plaque vulnerability without the risks of intervention. The promise of strain imaging includes the development of advanced diagnostic tools that can be used to predict plaque rupture. \u0000 \u0000This review paper presents the fundamental assumptions and methods that can be used to extract motion estimates from ultrasound images. In terms of assumptions, both the constant and non-constant brightness models are presented. The most commonly used energy functionals are presented, along with both local and global solutions. Motion and strain imaging examples are also provided to demonstrate the methods. Our goal is that this review will facilitate the development of new, reliable strain imaging methods that can be used to assess the risk of plaque rupture.","PeriodicalId":90184,"journal":{"name":"International journal of experimental and computational biomechanics","volume":"1 1","pages":"359"},"PeriodicalIF":0.0,"publicationDate":"2011-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1504/IJECB.2011.039947","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66744976","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2011-05-09DOI: 10.1504/IJECB.2011.039949
Hui Lin, Mei‐qing Wang
Mechanobiological growth is the biological process whereby bone growth is modulated by mechanical loading. The goal of this study is to develop an energy-based mechanobiological bone growth model. Mechanobiological procedures basically include mechanosensing and mechanoregulation. This study represented the mechanosensing as a mathematical model combining energy and mechanical-triggered deformation. The mechanoregulation was modelled as a mathematical form integrated distortion and dilatation energy. Mechanobiological growth model was developed from those two procedures and represented as a function of distortion and dilatation stresses. The model was tested by using finite element model of a thoracic vertebra (T7) for simulating one-year growth procedure under multi-axial loads. The simulation results presented the retarded and stimulated growth under compression and tension. Shear stress increased the growth rate with 20%–40%. This model agreed with experimental study of growth and published numerical growth simulation of human vertebrae as well as mechanobiology theory. This model allows simulating vertebral growth under multi-direction loads.
{"title":"An energy-based technique for the development of a mechanobiological growth model of vertebrae","authors":"Hui Lin, Mei‐qing Wang","doi":"10.1504/IJECB.2011.039949","DOIUrl":"https://doi.org/10.1504/IJECB.2011.039949","url":null,"abstract":"Mechanobiological growth is the biological process whereby bone growth is modulated by mechanical loading. The goal of this study is to develop an energy-based mechanobiological bone growth model. Mechanobiological procedures basically include mechanosensing and mechanoregulation. This study represented the mechanosensing as a mathematical model combining energy and mechanical-triggered deformation. The mechanoregulation was modelled as a mathematical form integrated distortion and dilatation energy. Mechanobiological growth model was developed from those two procedures and represented as a function of distortion and dilatation stresses. The model was tested by using finite element model of a thoracic vertebra (T7) for simulating one-year growth procedure under multi-axial loads. The simulation results presented the retarded and stimulated growth under compression and tension. Shear stress increased the growth rate with 20%–40%. This model agreed with experimental study of growth and published numerical growth simulation of human vertebrae as well as mechanobiology theory. This model allows simulating vertebral growth under multi-direction loads.","PeriodicalId":90184,"journal":{"name":"International journal of experimental and computational biomechanics","volume":"1 1","pages":"397"},"PeriodicalIF":0.0,"publicationDate":"2011-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1504/IJECB.2011.039949","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66745143","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2011-05-09DOI: 10.1504/IJECB.2011.039950
H. Chaudhry, N. Atalla, V. Singh, Max Roman, T. Findley
An automated anatomical torsion monitor (A-ATM) is developed to evaluate the stiffness and visco-elasticity of the low back as a static load is applied and removed from the pelvis. The resulting hysteresis loop area (HLA) is used to evaluate the mechanical properties of the low back. Also a technique for improving the low back dysfunction by imparting oscillations to the low back is presented. The before and after HLAs are compared for objective evaluation. It is observed that providing oscillations to the low back for five minutes at a frequency of 20 cycles per minute results in improved elasticity of the low back for those subjects whose BMI is 25 or less and an insignificant change in stiffness for all the subjects. However the correct displacement amplitude, frequency, and duration of treatment will depend upon individual medical and physical conditions.
{"title":"Evaluation of the rotational stiffness and visco-elasticity of the low back and improving the low back visco-elasticity","authors":"H. Chaudhry, N. Atalla, V. Singh, Max Roman, T. Findley","doi":"10.1504/IJECB.2011.039950","DOIUrl":"https://doi.org/10.1504/IJECB.2011.039950","url":null,"abstract":"An automated anatomical torsion monitor (A-ATM) is developed to evaluate the stiffness and visco-elasticity of the low back as a static load is applied and removed from the pelvis. The resulting hysteresis loop area (HLA) is used to evaluate the mechanical properties of the low back. Also a technique for improving the low back dysfunction by imparting oscillations to the low back is presented. The before and after HLAs are compared for objective evaluation. It is observed that providing oscillations to the low back for five minutes at a frequency of 20 cycles per minute results in improved elasticity of the low back for those subjects whose BMI is 25 or less and an insignificant change in stiffness for all the subjects. However the correct displacement amplitude, frequency, and duration of treatment will depend upon individual medical and physical conditions.","PeriodicalId":90184,"journal":{"name":"International journal of experimental and computational biomechanics","volume":"1 1","pages":"417"},"PeriodicalIF":0.0,"publicationDate":"2011-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1504/IJECB.2011.039950","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66745205","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2011-05-09DOI: 10.1504/IJECB.2011.039946
M. Makola, T. Goswami
A key factor in press fit hip implant fixation is the amount of interfacial motion between implant stem and the femur. A finite element analysis of hip implant stem designs was performed to determine the effect on stem interfacial motion. Implants of distinct cross section and stem profile were analysed. Implant material property effects were studied by analysing cobalt chromium (CoCr), stainless steel (SS316L), and titanium alloy (Ti 6Al-4V) implants. Each implant was subjected to a static loading simulating the weight of an average US male (189 lb) taking a step forward. Study results showed that implant cross section played a role in interfacial motion amounts. Ti 6Al-4V showed the greatest difference in implant interfacial motion as compared to SS316L and CoCr. Continued design and development of implant stems resistant to interfacial motion is needed.
{"title":"Hip implant stem interfacial motion, a finite element analysis","authors":"M. Makola, T. Goswami","doi":"10.1504/IJECB.2011.039946","DOIUrl":"https://doi.org/10.1504/IJECB.2011.039946","url":null,"abstract":"A key factor in press fit hip implant fixation is the amount of interfacial motion between implant stem and the femur. A finite element analysis of hip implant stem designs was performed to determine the effect on stem interfacial motion. Implants of distinct cross section and stem profile were analysed. Implant material property effects were studied by analysing cobalt chromium (CoCr), stainless steel (SS316L), and titanium alloy (Ti 6Al-4V) implants. Each implant was subjected to a static loading simulating the weight of an average US male (189 lb) taking a step forward. Study results showed that implant cross section played a role in interfacial motion amounts. Ti 6Al-4V showed the greatest difference in implant interfacial motion as compared to SS316L and CoCr. Continued design and development of implant stems resistant to interfacial motion is needed.","PeriodicalId":90184,"journal":{"name":"International journal of experimental and computational biomechanics","volume":"1 1","pages":"343"},"PeriodicalIF":0.0,"publicationDate":"2011-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1504/IJECB.2011.039946","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66744443","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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