Loading...
Search for:
hip
0.006 seconds
Total 32 records
The impingement-dislocation risk of total hip replacement: Effects of cup orientation and patient maneuvers
, Article Proceedings of the Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBS ; 2012 , Pages 6801-6804 ; 1557170X (ISSN) ; 9781424441198 (ISBN) ; Nickmanesh, R ; Tamannaee, N ; Farahmand, F ; Sharif University of Technology
2012
Abstract
Hip dislocation is one of the most frequent complications after total hip arthroplasty. Impingement and dislocation might be caused due to misalignment of the acetabular cup during surgery, or performing dislocation-prone activities afterwards. A finite element model was developed to predict the impingement and dislocation behavior of the prosthetic joint, for different combinations of cup orientation and patient maneuver. Four dislocation-prone activities of daily life and 25 cup orientations were analyzed to determine how close they are to the impingement and subsequent dcislocation events. The angular margin results obtained indicated that the sit-to-stand and standing while bending at...
A Comparative Evaluation of Prospect and Hip Hip Hooray English Textbooks
, M.Sc. Thesis Sharif University of Technology ; Jahangard, Ali (Supervisor)
Abstract
The current study aimed at both analyzing and evaluating Prospect course books(2012) with reference to a list of criteria which mainly consisted of: layout and physical appearance, different language skills, vocabulary, grammar, content and supplementary materials. Also a comparison was carried out between Prospect textbooks and Hip Hip hooray 2nd edition (2004) – a globally published ELT textbook taught at many Iranian private language institutes, in the related parts. The study is a qualitative one and makes use of descriptions and comparisons for providing data then content analysis has been used. The results showed that there are some positive points regarding Prospect, including...
A Micromechanical Approach to the Fracture of Femoral Bone during Total Hip Arthroplasty: A Threshold for the Maximum Allowable Press-Fit
, M.Sc. Thesis Sharif University of Technology ; Mohammadi Shoja, Hossein (Supervisor)
Abstract
The principle of micromechanics has been used to determine the maximum allowable press-fit for the hip stem during total hip arthroplasty. A 2D parametric solution has been presented. Bone and stem cross sections are modeled parametrically with respect to their geometry and mechanical properties. Surrounding soft tissue is also modeled and all the participating materials are considered as linear isotropic. Drucker-Prager fracture criterion is used to interpret the fracture phenomenon which is considered as both strain- and stress-state fracture. Considering presence of a thin layer of cancellous bone in the model caused a significant increase in results in comparison with previous numerical...
An analytical approach to study the intraoperative fractures of femoral shaft during total hip arthroplasty
, Article Journal of Biomechanical Engineering ; Volume 135, Issue 4 , 2013 ; 01480731 (ISSN) ; Farahmand, F ; Shodja, H. M ; Samadi Dooki, A ; Sharif University of Technology
2013
Abstract
An analytical approach which is popular in micromechanical studies has been extended to the solution for the interference fit problem of the femoral stem in cementless total hip arthroplasty (THA). The multiple inhomogeneity problem of THA in transverse plane, including an elliptical stem, a cortical wall, and a cancellous layer interface, was formulated using the equivalent inclusion method (EIM) to obtain the induced interference elastic fields. Results indicated a maximum interference fit of about 210 μm before bone fracture, predicted based on the Drucker-Prager criterion for a partially reamed section. The cancellous layer had a significant effect on reducing the hoop stresses in the...
Hip Joint Preforms Designing Steps With Inverse Finite Element Method
, M.Sc. Thesis Sharif University of Technology ; Movahhedi, Mohammad Reza (Supervisor) ; Akbari, Javad (Co-Advisor)
Abstract
Forging process is recognized as the high speed method, economical and with ability to produce high strength parts between metal forming processes. Preform design is the most important step in forging process. In the past this work was done based on experiences. In the complex parts because of error in design there was probability of diverse dies, so that method needed to spent so many times and costs. However recently with progress in computer programming we don’t need to produce diverse dies but spend many times. In this field many investigations are done to dispose designers skills, so forging preform design based on inverse finite elements method is denoted for this gold. In this thesis...
A new human interactive proofs system for deaf persons
, Article International Conference on Information Technology: New Generations, ITNG 2008, Las Vegas, NV, 7 April 2008 through 9 April 2008 ; 2008 , Pages 807-810 ; 0769530990 (ISBN); 9780769530994 (ISBN) ; Shirali Shahreza, M ; Sharif University of Technology
2008
Abstract
Nowadays the Internet users are from different ages and groups. Disabled people are a group of the Internet users. Some websites are especially created for disabled people and public access to them is undesirable. In this paper, for the first time, a method is introduced for distinguishing between deaf persons and other users using a new HIP (Human Interactive Proofs) system. In this method, the sign language is used. A word is shown as a movie using a sign language. The user should recognize the word and select it from a list. Only deaf persons can understand sign language and recognize the word, therefore other persons and also computer programs cannot enter the website. This project has...
Sintering of biocompatible P/M Co-Cr-Mo alloy (F-75) for fabrication of porosity-graded composite structures
, Article Materials Science and Engineering A ; Volume 472, Issue 1-2 , 2008 , Pages 338-346 ; 09215093 (ISSN) ; Godlinski, D ; Simchi, A ; Firouzdor, V ; Sharif University of Technology
2008
Abstract
Manufacturing of complex-shaped bimetals utilizing two-color powder injection molding (2C-PIM) and three-dimensional printing (3DP) processes, which basically involve sintering of a powder/binder mixture, has been attracted a great interest. This article addresses sintering of biocompatible Co-Cr-Mo alloy for manufacturing stepwise porosity-graded composite structures. Such composite structures provide strength at the core and a porous layer for the tissue growth. To evaluate the process, two grades of gas atomized Co-Cr-Mo powder with an average particle size of 19 and 63 μm were used. Isothermal and non-isothermal sintering behavior of the loose powders under hydrogen and argon...
An improved methodology for design of custom-made hip prostheses to be fabricated using additive manufacturing technologies
, Article Rapid Prototyping Journal ; Volume 18, Issue 5 , 2012 , Pages 389-400 ; 13552546 (ISSN) ; Abbaszadeh, F ; Farahmand, F ; Sharif University of Technology
Emerald
2012
Abstract
Purpose - The purpose of this paper is to present an improved methodology for design of custom-made hip prostheses, through integration of advanced image processing, computer aided design (CAD) and additive manufacturing (AM) technologies. Design/methodology/approach - The proposed methodology for design of custom-made hip prostheses is based on an independent design criterion for each of the intra-medullary and extra-medullary portions of the prosthesis. The intra-medullar part of the prosthesis is designed using a more accurate and detailed description of the 3D geometry of the femoral intra-medullary cavity, including the septum calcar ridge, so that an improved fill and fit performance...
A computer model for evaluating the osteotomy parameters of Chiari pelvic osteotomy
, Article International Orthopaedics ; Volume 34, Issue 3 , 2010 , Pages 329-333 ; 03412695 (ISSN) ; Gouran Savadkoohi, D ; Ghadirpoor, A ; Rahimpoor, S ; Azghani, M ; Farahmand, F ; Sharif University of Technology
2010
Abstract
This study was conducted to evaluate the effect of the various osteotomy parameters on the biomechanical aspects of the hip joint on a computerised model. The data of the radiographs and a three-dimensional (3D) CT scan of six patients with coverage deficient hip joint were used to construct a 3D computer model. Then Chiari type osteotomies were simulated using various heights, angles and fibrocartilage thicknesses. A new angle called the mid acetabular center edge (MACE) angle was defined in a mid coronal CT cut. The optimum displacement for obtaining the maximum coverage averaged 73%. The angle and height of the osteotomy had a significant effect on the MACE angle (P value∈<∈0. 01). Our...
Design and Manufacture of Hip Joint Simulator
, M.Sc. Thesis Sharif University of Technology ; Movahhedy, Mohammad Reza (Supervisor) ; Farahmand, Farzam (Co-Advisor)
Abstract
Human joints wear gradually by diseases like arthrosis and will fail. The Pain from joint erode, preventing tracking daily activities, wont disappear by medicines and joint replacement is a common treatment. Hip joint as one of the most important, largest and heaviest joints of the body,is no exception.
Over 600,000 worldwide annual hip replacement surgery is done. The joints are designed in such a way that it can move 15 years without significant wear. Different materials such as ceramics, polymers and metals are used in making it which before in vivo use, itmust succeed many tests like wear test.
Since making artificial joints become increasingly important in recent years and...
Over 600,000 worldwide annual hip replacement surgery is done. The joints are designed in such a way that it can move 15 years without significant wear. Different materials such as ceramics, polymers and metals are used in making it which before in vivo use, itmust succeed many tests like wear test.
Since making artificial joints become increasingly important in recent years and...
Design and Simulation of Manufacturing of Hip Prosthesis
, M.Sc. Thesis Sharif University of Technology ; Movahedi, Mohammad Reza (Supervisor)
Abstract
Nowadays, with a constant increase in life expectancy, joints pain and deficiencies have become a major problem and the use of prosthesis is increasing. One of the most important joint in human body is the hip joint which bear a major share of forces in daily activities. Hip joint is a cup-sphere joint with 3 degrees of freedom (DOF). Therefore, design and manufacturing of such prosthesis is very important. The objective of this thesis is to develop the know how for manufacturing of a standard hip prosthesis by hot forging of Ti6Al4V alloy. First a review of kinematics of bones and joints and forces on hip joint is presented, then the proper process for manufacturing of the hip prosthesis...
Prediction of the lower extremity muscle forces during stair ascent and descent
, Article 2008 Proceedings of the ASME International Design Engineering Technical Conferences and Computers and Information in Engineering Conference, DETC 2008, 3 August 2008 through 6 August 2008, New York City, NY ; Volume 3, Issue PART B , 2009 , Pages 1589-1593 ; 9780791843253 (ISBN) ; Meghdari, A ; Vossoughi, G. R ; Design Engineering Division, ASME ; Sharif University of Technology
2009
Abstract
An inverse dynamics musculoskeletal model of the lower extremity was combined with an optimization technique to estimate individual muscular forces and powers during stair ascent and descent. Eighteen Hill-type musculotendon actuators per leg were combined into the eleven functional muscle groups based on anatomical classification to drive the model in the sagittal plane. Simulation results illustrate the major functional differences in plantar flexors of the ankle and extensors of the knee and hip joints during ascent and descent. The results of this study not only could be employed to evaluate the rehabilitation results in the elderly but also could be used to design more anthropometric...
Identifying child users: Is it possible?
, Article SICE Annual Conference 2008 - International Conference on Instrumentation, Control and Information Technology, Tokyo, 20 August 2008 through 22 August 2008 ; October , 2008 , Pages 3241-3244 ; 9784907764296 (ISBN) ; Shirali Shahreza, M ; IEEE ; Sharif University of Technology
2008
Abstract
There are many websites on the Internet which are for adult users and we want to restrict access to them for adults only. Adult content filtering programs on client computers are the current available solutions. But if we can identify the child users at server side, we can protect the children more. In this paper, we try to answer the question that whether it is possible to identify child users or not? © 2008 SICE
Prediction of the lower extremity muscle forces during stair ascent and descent
, Article ASME 2008 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference, IDETC/CIE2008, Brooklyn, NY, 3 August 2008 through 6 August 2008 ; Volume 3, Issue PARTS A AND B , July , 2008 , Pages 1589-1593 ; 9780791843277 (ISBN) ; Meghdari, A ; Vossoughi, G. R ; Sharif University of Technology
2008
Abstract
An inverse dynamics musculoskeletal model of the lower extremity was combined with an optimization technique to estimate individual muscular forces and powers during stair ascent and descent. Eighteen Hill-type musculotendon actuators per leg were combined into the eleven functional muscle groups based on anatomical classification to drive the model in the sagittal plane. Simulation results illustrate the major functional differences in plantar flexors of the ankle and extensors of the knee and hip joints during ascent and descent. The results of this study not only could be employed to evaluate the rehabilitation results in the elderly but also could be used to design more anthropometric...
Kinematic and dynamic analysis of the gait cycle of above-knee amputees
, Article Scientia Iranica ; Volume 13, Issue 3 , 2006 , Pages 261-271 ; 10263098 (ISSN) ; Rezaeian, T ; Narimani, R ; Hejazi Dinan, P ; Sharif University of Technology
Sharif University of Technology
2006
Abstract
The change of gait pattern and muscular activity following amputation is thought to be responsible for the higher incidence of joint degenerative disorders observed in amputees. Considering the lack of consistent data in the literature, the purpose of the present study was to measure and analyze the spatio-temporal variables, the kinematics and, particularly, the net joint moments of the intact and prosthetic limbs of above knee amputee subjects during walking and to compare the results with those of normals. The gait characteristics of five transfemoral amputees and five normal subjects were measured using videography and a force platform. The human body was modeled as a 2-D sagittal plane...
Dynamic simulation of biomechanical behaviour of the pelvis in the lateral impact loads
, Article Journal of Healthcare Engineering ; Volume 2018 , 2018 ; 20402295 (ISSN) ; Wang, D ; Qu, A ; Xiangsen, Z ; Wang, Q ; Baradaran Kazemian, B ; Sharif University of Technology
Abstract
The objective of this study was to develop and validate a novel 3D dynamic model of a pelvic side-impactor system. The biomechanical responses of a pelvic flexible model (having.mnf file suffix) under the lateral impact load for predicting the bone fracture mechanism are investigated as well. The 3D solid model of the side-impactor system was imported into MSC/ADAMS software for analyzing the dynamic model, and the pelvic flexible model was extracted from the CT images of a Chinese female volunteer. The flexible model of the pelvis system was developed considering a wide range of mechanical properties in the bone complex and soft tissue to achieve a realistic biomechanical response during a...
Improved wear, mechanical, and biological behavior of UHMWPE-HAp-zirconia hybrid nanocomposites with a prospective application in total hip joint replacement
, Article Journal of Materials Science ; 2018 ; 00222461 (ISSN) ; Mohseni Taromsari, S ; Bagheri, R ; Faghihi Sani, M. A ; Sharif University of Technology
Springer New York LLC
2018
Abstract
Medical engineering advances in total joint replacements and societies’ rising demand for long-lasting materials have proven it essential to manufacture materials that are more similar to the original tissue in the fields of mechanical, tribological, and biological properties. Ultra-high molecular weight polyethylene (UHMWPE) is a polymer widely used in arthroplasty applications due to its biocompatibility, chemical stability, and reasonable mechanical properties; however, it still fails to entirely meet the standards of the hip joint implant. In this study, different concentrations of nanosized zirconia were added to UHMWPE and HAp matrix with an intended application in arthroplasty....
Improved wear, mechanical, and biological behavior of UHMWPE-HAp-zirconia hybrid nanocomposites with a prospective application in total hip joint replacement
, Article Journal of Materials Science ; Volume 54, Issue 5 , 2019 , Pages 4259-4276 ; 00222461 (ISSN) ; Mohseni Taromsari, S ; Bagheri, R ; Faghihi Sani, M. A ; Sharif University of Technology
Springer New York LLC
2019
Abstract
Medical engineering advances in total joint replacements and societies’ rising demand for long-lasting materials have proven it essential to manufacture materials that are more similar to the original tissue in the fields of mechanical, tribological, and biological properties. Ultra-high molecular weight polyethylene (UHMWPE) is a polymer widely used in arthroplasty applications due to its biocompatibility, chemical stability, and reasonable mechanical properties; however, it still fails to entirely meet the standards of the hip joint implant. In this study, different concentrations of nanosized zirconia were added to UHMWPE and HAp matrix with an intended application in arthroplasty....
Trunk, pelvis, and knee kinematics during running in females with and without patellofemoral pain
, Article Gait and Posture ; Volume 89 , 2021 , Pages 80-85 ; 09666362 (ISSN) ; Ebrahimi, S ; Rezaie, M ; Shafiee, E ; Shokouhyan, S. M ; Motealleh, A ; Parnianpour, M ; Sharif University of Technology
Elsevier B.V
2021
Abstract
Background: Females are two times more likely to develop patellofemoral pain (PFP) than males. Abnormal trunk and pelvis kinematics are thought to contribute to the pathomechanics of this condition. However, there is a scarcity of evidence investigating proximal segments kinematics in females with PFP. Research question: The purpose of this study was to investigate whether females with PFP demonstrate altered trunk, pelvis, and knee joint kinematics compared with healthy controls during running. Methods: Thirty-four females (17 PFP, 17 controls) underwent a 3-dimensional motion analysis during treadmill running at preferred and fixed speeds, each trial for 30 s. Variables of interest...
Influence of Rejuvenation Treatment on Microstructure and Creep Properties of Damaged IN738LC Superalloy
, Ph.D. Dissertation Sharif University of Technology ; Nategh, Saeed (Supervisor) ; Ekrami, Ali Akbar (Supervisor)
Abstract
The goal of the present study is to investigate the effect of rejuvenation treatment on microstructure and creep properties of damaged IN738LC superalloy. Virgin alloy was damaged by interrupted creep tests at 926°C and 170 MPa for 100, 200 and 250 hours. The results obtained showed that damaging the virgin alloy by interrupted creep tests resulted in microstructural deterioration (consisting of coarsening of ' precipitates, formation of continuous films of ' on grain boundary regions and formation of transition zone around MC carbides) and, consequently, degradation of creep properties. Rejuvenation treatment was carried out with the purpose of healing the damaged alloy and restoration of...