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Total 115 records

    Arthrometric evaluation of stabilizing effect of knee functional bracing at different flexion angles

    , Article Journal of Sports Science and Medicine ; Volume 8, Issue 2 , 2009 , Pages 247-251 ; 13032968 (ISSN) Mohseni, S. S ; Farahmand, F ; Karimi, H ; Kamali, M ; Sharif University of Technology
    2009
    Abstract
    Previous in-vivo investigations on the stabilizing efficacy of knee bracing for ACL reconstructed patients have been often limited to 20-30 degrees of knee flexion. In this study, the effectiveness of a uniaxial hinged functional brace to improve the knee stability was assessed at 30, 60 and 90 degrees of knee flexion. Arthrometry tests were conducted on 15 healthy subjects before and following wearing the brace and the tibial displacements were measured at up to 150 N anterior forces. Results indicated that functional bracing has a significant stabilizing effect throughout the range of knee flexion examined (p < 0.05). The rate of effectiveness, however, was not consistent across the... 

    Global trends of hand and wrist trauma: A systematic analysis of fracture and digit amputation using the Global Burden of Disease 2017 Study

    , Article Injury Prevention ; 2020 Crowe, C. S ; Massenburg, B.B ; Morrison, S.D ; Chang, J ; Friedrich, J.B ; Abady, G.G ; Alahdab, F ; Alipour, V ; Arabloo, J ; Asaad, M ; Banach, M ; Bijani, A ; Borzì, A.M ; Briko, N.I ; Castle, C.D ; Cho, D.Y ; Chung, M.T ; Daryani, A ; Demoz, G.T ; Dingels, Z.V ; Do, H.T ; Fischer, F ; Fox, J.T ; Fukumoto, T ; Gebre, A.K ; Gebremichael, B ; Haagsma, J.A ; Haj-Mirzaian, A ; Handiso, D.W ; Hay, S.I ; Hoang, C.L ; Irvani, S.S.N ; Jozwiak, J.J ; Kalhor, R ; Kasaeian, A ; Khader, Y.S ; Khalilov, R ; Khan, E.A ; Khundkar, R ; Kisa, S ; Kisa, A ; Liu, Z ; Majdan, M ; Manafi, N ; Manafi, A ; Manda, A.-L ; Meretoja, T.J ; Miller, T.R ; Mohammadian Hafshejani, A ; Mohammadpourhodki, R ; Mohseni Bandpei, M.A ; Mokdad, A.H ; Naimzada, M.D ; Ndwandwe, D.E ; Nguyen, C.T ; Nguyen, H.L.T ; Olagunju, A.T ; Olagunju, T.O ; Pham, H.Q ; Pribadi, D.R.A ; Rabiee, N ; Ramezanzadeh, K ; Ranganathan, K ; Roberts, N.L.S ; Roever, L ; Safari, S ; Samy, A.M ; Sanchez Riera, L ; Shahabi, S ; Smarandache, C.-G ; Sylte, D.O ; Tesfay, B.E ; Tran, B.X ; Ullah, I ; Vahedi, P ; Vahedian Azimi, A ; Vos, T ; Woldeyes, D. H ; Wondmieneh, A. B ; Zhang, Z. J ; James, S. L ; Sharif University of Technology
    BMJ Publishing Group  2020
    Abstract
    Background: As global rates of mortality decrease, rates of non-fatal injury have increased, particularly in low Socio-demographic Index (SDI) nations. We hypothesised this global pattern of non-fatal injury would be demonstrated in regard to bony hand and wrist trauma over the 27-year study period. Methods: The Global Burden of Diseases, Injuries, and Risk Factors Study 2017 was used to estimate prevalence, age-standardised incidence and years lived with disability for hand trauma in 195 countries from 1990 to 2017. Individual injuries included hand and wrist fractures, thumb amputations and non-thumb digit amputations. Results: The global incidence of hand trauma has only modestly... 

    Design and analysis of an original powered foot clearance creator mechanism for walking in patients with spinal cord injury

    , Article Disability and Rehabilitation: Assistive Technology ; March , 2018 , Pages 1-5 ; 17483107 (ISSN) Maleki, M ; Badri, S ; Shayestehepour, H ; Arazpour, M ; Farahmand, F ; Mousavi, M. E ; Abdolahi, E ; Farkhondeh, H ; Head, J. S ; Golchin, N ; Mardani, M. A ; Sharif University of Technology
    Taylor and Francis Ltd  2018
    Abstract
    Background: The aim of this study was to assess the performance of an original powered foot clearance creator (PFCC) mechanism worn in conjunction with an isocentric reciprocal gait orthosis (IRGO) and evaluate its effect on trunk compensatory movements and spatiotemporal parameters in nine healthy subjects. Method: A PFCC motorized mechanism was designed that incorporated twin sole plates, the movements of which enabled increased toe to floor clearance during swing phase. A prototype was constructed in combination with an IRGO, and hence was re-named as an IRGO-PFCC orthosis. The effects of IRGO-PFCC usage on the spatiotemporal parameters and trunk compensatory movements during walking were... 

    Improving sit-to-stand transition by the saddle-assistive device in the spinal cord injury: A case study

    , Article Proceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine ; Volume 235, Issue 7 , 2021 , Pages 735-742 ; 09544119 (ISSN) Hojjati Najafabadi, A ; Amini, S ; Farahmand, F ; Sharif University of Technology
    SAGE Publications Ltd  2021
    Abstract
    Physical problems caused by fractures, aging, stroke, and accidents can reduce foot power; these, in the long term, can dwindle the muscles of the waist, thighs, and legs. These conditions provide the basis for the invalidism of the harmed people. In this study, a saddle-walker was designed and evaluated to help people suffering from spinal cord injury and patients with lower limb weakness. This S-AD works based on body weight support against the previously report designs. This saddle-walker consisted of a non-powered four-wheel walker helping to walk and a powered mechanism for the sit-to-stand (STS) transfer. A set of experiments were done on the STS in the use of the standard walker and... 

    A computational dynamic finite element simulation of the thoracic vertebrae under blunt loading: spinal cord injury

    , Article Journal of the Brazilian Society of Mechanical Sciences and Engineering ; Volume 41, Issue 2 , 2019 ; 16785878 (ISSN) Biglari, H ; Razaghi, R ; Ebrahimi, S ; Karimi, A ; Sharif University of Technology
    Springer Verlag  2019
    Abstract
    Spinal cord is a long, thin, tubular bundle of nervous tissue located in the vertebral column. Since the spinal cord is one of the most crucial pathways for information connecting of the central nervous system, it has to stay safe under any blunt impact loading, i.e., accident, punch, gunshot, burst, etc. Therefore, it is important to investigate the possible injuries that may occur in the vertebral column, especially the spinal cord, as a result of blunt loading. However, due to various experimental limitations, numerical modelling, specifically finite element (FE) models, has been beneficial in predicting the injury to the spinal cord. This study, thus, aimed at predicting the stresses and... 

    Reliability of center of pressure measures of postural stability in patients with unilateral anterior cruciate ligament injury

    , Article Journal of Applied Sciences ; Volume 8, Issue 17 , 2008 , Pages 3019-3025 ; 18125654 (ISSN) Hadian, M. R ; Negahban, H ; Talebian, S ; Salavati, M ; Jafari, A. H ; Sanjari, M. A ; Mazaheri, M ; Parnianpour, M ; Sharif University of Technology
    2008
    Abstract
    The aim of this study was to estimate the test-retest reliability of some commonly used center of pressure measures in postural control investigations of sport injuries under the diverse stressful postural conditions. Twelve patients with anterior cruciate ligament injury were evaluated on two separate sessions. The center of pressure was recorded from force platform and the following measures were calculated (1) standard deviation of amplitude (2) mean velocity (3) standard deviation of velocity (4) phase plane parameters and (5) area (95% confidence ellipse). Relative and absolute reliability was assessed using intra-class correlation coefficient and coefficient of variation, respectively.... 

    Using a saddle-assistive device equipped with mechanical orthosis for walking of the person with incomplete spinal cord injury

    , Article Proceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine ; Volume 235, Issue 9 , May , 2021 , Pages 1088-1095 ; 09544119 (ISSN) Hojjati Najafabadi, A ; Amini, S ; Farahmand, F ; Sharif University of Technology
    SAGE Publications Ltd  2021
    Abstract
    The majority of the people with incomplete spinal cord injury lose their walking ability, due to the weakness of their muscle motors in providing torque. As a result, developing assistive devices to improve their conditionis of great importance. In this study, a combined application of the saddle-assistive device (S-AD) and mechanical medial linkage or thosis was evaluated to improve the walking ability in patients with spinal cord injury in the gait laboratory. This mobile assistive device is called the saddle-assistive device equipped with medial linkage or thosis (S-ADEM). In this device, a mechanical orthosis was used in a wheeled walker as previously done in the literature. Initially,... 

    The development of a Smart Shoulder-wheel for Analysis of Shoulder Tendonitis Injuries

    , M.Sc. Thesis Sharif University of Technology Hashemi, Naser (Author) ; Behzadipour, Saeed (Supervisor)
    Abstract
    Nowadays the process of making smart rehabilitations' equipment is at the centre of physicists' attention, so this affair is a matter of research in the medical engineering.Amongst of the advantages of this method there are: increasing the efficiency, recording patients' information, no need for continuous physiotherapists and therapists' presence in all the process of medical treatment, and saving time and money. In addition, due to removing traditional methods of rehabilitation, the precision and control ability of medical treatment is considerably increased, reducing the unexpected injuries during the exercise. The shoulder wheel is one of the useful devise in clinics physiotherapy... 

    What factors results in having a severe crash? a closer look on distraction-related factors

    , Article Cogent Engineering ; Volume 6, Issue 1 , 2019 ; 23311916 (ISSN) Razi Ardakani, H ; Mahmoudzadeh, A ; Kermanshah, M ; Sharif University of Technology
    Cogent OA  2019
    Abstract
    This study provides a comprehensive literature review to summarize all contributing factors and the logit-based models that were used to predict the severity of crashes. Using the General Estimates Systems (GES) dataset, as a subset and a branch of the National Automotive Sampling System in the US, a Generalized Ordered Logit (GLM) model is developed to predict the crash severity. The developed severity model detects the most important parameters based on characteristics of the driver, the environment, the vehicle, the road, and the type of crash. This study aims to take a more in-depth look into the distraction-related factors as one of the most important groups of contributing factors to... 

    Assessment of lumbar spinal disc injury in frontal crashes

    , Article Computers in Biology and Medicine ; Volume 123 , 2020 Amiri, S ; Naserkhaki, S ; Parnianpour, M ; Sharif University of Technology
    Elsevier Ltd  2020
    Abstract
    Frontal vehicle crashes have been a leading cause of spinal injuries in recent years. Reconstruction of frontal crashes using computational models and spinal load analysis helps us understand the patterns of injury and load propagation during frontal crashes. By reconstructing a real crash test and using a viscoelastic crash dummy model, spinal injury patterns were analyzed. The results indicated that a moderate crash with an impact speed of 56 km/h leads to injuries in L1-L2 and L5-S1 levels (L for lumbar and S for sacral vertebrae). The largest spinal loads and injuries were mainly observed immediately after the airbag deployment when the peak of the crash acceleration transpires. Also,... 

    Investigating the injury severity of single-vehicle truck crashes in a developing country

    , Article Accident Analysis and Prevention ; Volume 137 , 2020 Rahimi, E ; Shamshiripour, A ; Samimi, A ; Mohammadian, A. K ; Sharif University of Technology
    Elsevier Ltd  2020
    Abstract
    Trucking plays a vital role in economic development in every country, especially countries where it serves as the backbone of the economy. The fast growth of economy in Iran as a developing country has also been accompanied by an alarming situation in terms of fatalities in truck-involved crashes, among the drivers and passengers of the trucks as well as the other vehicles involved. Despite the sizable efforts to investigate the truck-involved crashes, very little is known about the safety of truck movements in developing countries, and about the single-truck crashes worldwide. Thus, this study aims to uncover significant factors associated with injury severities sustained by truck drivers... 

    Simvastatin-loaded nano-niosomes confer cardioprotection against myocardial ischemia/reperfusion injury

    , Article Drug Delivery and Translational Research ; 2021 ; 2190393X (ISSN) Naseroleslami, M ; Niri, N. M ; Akbarzade, I ; Sharifi, M ; Aboutaleb, N ; Sharif University of Technology
    Springer  2021
    Abstract
    Although simvastatin (SIM) has been proven to be a powerful agent against myocardial ischemia/reperfusion (MI/R) injury, poor water solubility, short half-life, and low bioavailability have made it futile while using conventional drug delivery system. Hence, this study aims to investigate therapeutic efficacy of SIM-loaded nano-niosomes on MI/R injury. Surface active agent film hydration method was used to synthesize nano-niosomes. The physicochemical properties of nano-niosomes were characterized using dynamic light scattering (DLS) and transmission electron microscopy (TEM). Moreover, niosomes were characterized in entrapment efficiency (EE) and releasing pattern. Male Wistar rats were... 

    Modelling and analysis of the effect of angular velocity and acceleration on brain strain field in traumatic brain injury

    , Article ASME International Mechanical Engineering Congress and Exposition, Proceedings (IMECE) ; Volume 3 A , 2013 ; 9780791856215 (ISBN) Hoursan, H ; Ahmadian, M. T ; Barari, A ; Beidokhti, H. N ; Sharif University of Technology
    Abstract
    Traumatic brain injury (TBI) has long been known as one of the most anonymous reasons for death around the world. A presentation of a model of what happens in the process has been under study for many years; and yet it remains a question due to physiological, geometrical and computational complications. Although the facilities for soft tissue modeling have improved and the precise CT-imaging of human head has revealed novel details of brain, skull and the interface (the meninges), a comprehensive FEM model of TBI is still being studied. This study aims to present an optimized model of human head including the brain, skull, and the meninges after a comprehensive study of the previous models.... 

    Nerve retraction during inferior alveolar nerve repositioning procedure: a new simple method and review of the literature

    , Article The Journal of oral implantology ; Volume 41 , 2015 , Pages 391-394 ; 01606972 (ISSN) Hassani, A ; Saadat, S ; Moshiri, R ; Shahmirzad, S ; Hassani, A ; Sharif University of Technology
    2015
    Abstract
    Nerve repositioning surgery is one of the treatments chosen for the patients with edentulous posterior atrophic mandible. Like any other treatments, this therapy has its advantages and disadvantages, indications and contraindications. The most important complication of this procedure is neurosensory disturbance. This problem may occur at different stages of the treatment. One common time when nerve damage happens is when the nerve is located outside the canal and drilling and insertion of the implant are performed. Accordingly, this report describes a simple and feasible method to retract and protect nerves outside the canal during the treatment of nerve transposition. This will reduce the... 

    Designing instrumented walker to measure upper-extremity’s efforts: a case study

    , Article Assistive Technology ; 2018 , Pages 1-9 ; 10400435 (ISSN) Khodadadi, M ; Arab Baniasad, M ; Arazpour, M ; Farahmand, F ; Zohoor, H ; Sharif University of Technology
    Taylor and Francis Inc  2018
    Abstract
    The high prevalence of shoulder pain in using walkers in patients who have spinal cord injury (SCI). Also, the limited options available to economically measure grip forces in walkers, which drove the need to create one. This article describes a method to obtain upper-extremities’ forces and moments in a person with SCI by designing an appropriate instrumented walker. First, since the commercial multidirectional loadcells are too expensive, custom loadcells are fabricated. Ultimately, a complete gait analysis by means of VICON motion analysis and using inverse dynamic method has been held to measure upper-extremities’ efforts. The results for a person with SCI using a two-wheel walker in low... 

    Designing instrumented walker to measure upper-extremity’s efforts: A case study

    , Article Assistive Technology ; Volume 31, Issue 5 , 2019 , Pages 267-275 ; 10400435 (ISSN) Khodadadi, M ; Baniasad, M. A ; Arazpour, M ; Farahmand, F ; Zohoor, H ; Sharif University of Technology
    Taylor and Francis Inc  2019
    Abstract
    The high prevalence of shoulder pain in using walkers in patients who have spinal cord injury (SCI). Also, the limited options available to economically measure grip forces in walkers, which drove the need to create one. This article describes a method to obtain upper-extremities’ forces and moments in a person with SCI by designing an appropriate instrumented walker. First, since the commercial multidirectional loadcells are too expensive, custom loadcells are fabricated. Ultimately, a complete gait analysis by means of VICON motion analysis and using inverse dynamic method has been held to measure upper-extremities’ efforts. The results for a person with SCI using a two-wheel walker in low... 

    Design and analysis of an original powered foot clearance creator mechanism for walking in patients with spinal cord injury

    , Article Disability and Rehabilitation: Assistive Technology ; Volume 14, Issue 4 , 2019 , Pages 333-337 ; 17483107 (ISSN) Maleki, M ; Badri, S ; Shayestehepour, H ; Arazpour, M ; Farahmand, F ; Mousavi, M. E ; Abdolahi, E ; Farkhondeh, H ; Head, J. S ; Golchin, N ; Mardani, M. A ; Sharif University of Technology
    Taylor and Francis Ltd  2019
    Abstract
    Background: The aim of this study was to assess the performance of an original powered foot clearance creator (PFCC) mechanism worn in conjunction with an isocentric reciprocal gait orthosis (IRGO) and evaluate its effect on trunk compensatory movements and spatiotemporal parameters in nine healthy subjects. Method: A PFCC motorized mechanism was designed that incorporated twin sole plates, the movements of which enabled increased toe to floor clearance during swing phase. A prototype was constructed in combination with an IRGO, and hence was re-named as an IRGO-PFCC orthosis. The effects of IRGO-PFCC usage on the spatiotemporal parameters and trunk compensatory movements during walking were... 

    Anisotropic finite element modelling of traumatic brain injury: A voxel-based approach

    , Article Scientia Iranica ; Volume 28, Issue 3 B , 2021 , Pages 1271-1283 ; 10263098 (ISSN) Hoursan, H ; Farahmand, F ; Ahmadian, M. T ; Masjoodi, S ; Sharif University of Technology
    Sharif University of Technology  2021
    Abstract
    A computationally efficient 3D human head finite element model was constructed. The model includes the mesoscale geometrical details of the brain including the distinction between white and grey matter, sulci and gyri, the ventricular system, foramen magnum, and cerebrospinal fluid. The heterogeneity and anisotropy from diffusion tensor imaging data were incorporated by applying a one-to-one voxel-based correspondence between diffusion voxels and finite elements. The voxel resolution of the model was optimized to obtain a trade-off between reduced computational cost and higher geometrical details. Three sets of constitutive material properties were extracted from the literature to validate... 

    Design, Manufacturing and Assessment of a Stiffness Measurement Tool From Clinical Aspect, for Diagnosing Anterior Cruciate Ligament During Arthroscopy

    , M.Sc. Thesis Sharif University of Technology Shokrani, Amir Hossein (Author) ; Saadat Foumani, Mahmoud (Supervisor) ; Narimani, Roya (Co-Advisor)
    Abstract
    Every year a significant number of people in the world suffer knee injuries due to sport activities and accidents. Ligament tearing accounts for majority of knee injury cases. Clinical tests for diagnosing ligament injuries, give us just qualitative results. Modern pieces of equipment quickly and precisely give us the status of ligaments. In this project, we attempt to design and manufacture a clinical equipment that could log ligament’s stiffness during the arthroscopy; such that this information could be screened throughout the test  

    Detecting Community Structures in Patients with Peripheral Nervous System Disorders

    , M.Sc. Thesis Sharif University of Technology Hosseinioun, Morteza (Author) ; Hemmatyar, Ali Mohammad Afshin (Supervisor) ; Movaghar, Ali (Supervisor)
    Abstract
    Nowadays, many biological systems are modeled by bipartite networks. So, using network's concepts and techniques such as community detection may lead us to more accurate outcomes.In this thesis, we have presented an algorithm for detection of communities in a network of patients with Peripheral Nervous System (PNS) issues. The bipartite network of the patients is formed based on the dataset which is collected with cooperation of a Spinal Specialty Clinic. In our algorithm, called MRComSim, three different methods are used to project the bipartite graph to unipartite graph. Then the projected unipartite graph of each method is used for community detection. The output result of our algorithm...