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Your search keyword '"Hamid Nayeb-Hashemi"' showing total 3 results
Start Over Author "Hamid Nayeb-Hashemi" Journal computer methods in biomechanics and biomedical engineering
3 results on '"Hamid Nayeb-Hashemi"'

1. Failure locus of the anterior cruciate ligament: 3D finite element analysis

Author

Hamid Nayeb-Hashemi, Story Wibby, Nicholas H. Yang, A. Orsi, Paul K. Canavan, and Andrew Homyk

Subjects
musculoskeletal diseases, medicine.medical_specialty, Anterior cruciate ligament, Finite Element Analysis, Biomedical Engineering, Bioengineering, Knee Injuries, medicine.disease_cause, Models, Biological, Weight-bearing, Weight-Bearing, Elastic Modulus, Tensile Strength, medicine, Humans, Computer Simulation, Femur, Anterior Cruciate Ligament, Range of Motion, Articular, Orthodontics, biology, business.industry, Anterior Cruciate Ligament Injuries, Cartilage, General Medicine, Femoral rotation, musculoskeletal system, medicine.disease, biology.organism_classification, ACL injury, Tibial cartilage, Computer Science Applications, Surgery, body regions, Human-Computer Interaction, Valgus, surgical procedures, operative, medicine.anatomical_structure, Stress, Mechanical, business, human activities
Abstract

Anterior cruciate ligament (ACL) disruption is a common injury that is detrimental to an athlete's quality of life. Determining the mechanisms that cause ACL injury is important in order to develop proper interventions. A failure locus defined as various combinations of loadings and movements, internal/external rotation of femur and valgus and varus moments at a 25(o) knee flexion angle leading to ACL failure was obtained. The results indicated that varus and valgus movements were more dominant to the ACL injury than femoral rotation. Also, Von Mises stress in the lateral tibial cartilage during the valgus ACL injury mechanism was 83% greater than that of the medial cartilage during the varus mechanism of ACL injury. The results of this study could be used to develop training programmes focused on the avoidance of the described combination of movements which may lead to ACL injury.

Published
2012

2. Computational model of rib movement and its application in studying the effects of age-related thoracic cage calcification on respiratory system

Author

Hamid Nayeb-Hashemi, Ashkan Vaziri, and B. Akhavan-Tafti

Subjects
Models, Anatomic, musculoskeletal diseases, Aging, Movement, Finite Element Analysis, Biomedical Engineering, Ribs, Thoracic Cavity, Bioengineering, Models, Biological, Imaging, Three-Dimensional, Age related, medicine, Humans, Computer Simulation, Respiratory system, Sternocostal joints, Rib cage, business.industry, Rib Movement, Calcinosis, Muscle weakness, General Medicine, Anatomy, Costal cartilage, medicine.disease, Elasticity, Respiratory Muscles, Computer Science Applications, Human-Computer Interaction, Cartilage, medicine.anatomical_structure, Linear Models, Respiratory Mechanics, medicine.symptom, business, Calcification
Abstract

A 3D finite element model of rib cage movement is developed and used to study the role of age-related costal cartilage and sternocostal joint calcification, as well as respiratory muscle weakness on the 'bucket-handle' movement of human rib. The volume displacement of the rib cage is related to changes in its circumference using an empirical equation presented by Agostoni et al. (1965, J Appl Physiol, 20:1179-1186). A systematic study is carried out to quantify the role of costal cartilage, sternocostal joint calcification and muscle weakness on the volume displacement of the rib cage. The results provide insight into some of the mechanisms underlying age-related changes in the respiratory system.

Published
2010

3. Protocol for constructing subject-specific biomechanical models of knee joint

Author

Ashkan Vaziri, Hamid Nayeb-Hashemi, Bijan Najafi, Nicholas H. Yang, and Paul K. Canavan

Subjects
Engineering drawing, Motion analysis, Engineering, Knee Joint, Finite Element Analysis, Biomedical Engineering, Bioengineering, Meniscus (anatomy), medicine, Humans, Force platform, Protocol (object-oriented programming), business.industry, Biomechanics, General Medicine, Structural engineering, musculoskeletal system, Finite element method, Computer Science Applications, Biomechanical Phenomena, Human-Computer Interaction, medicine.anatomical_structure, Ligament, business, human activities
Abstract

A robust protocol for building subject-specific biomechanical models of the human knee joint is proposed which uses magnetic resonance imaging, motion analysis and force platform data in conjunction with detailed 3D finite element models. The proposed protocol can be used for determining stress and strain distributions and contact kinetics in different knee elements at different body postures during various physical activities. Several examples are provided to highlight the capabilities and potential applications of the proposed protocol. This includes preliminary results on the role of body weight on the stresses and strains induced in the knee articular cartilages and meniscus during single-leg stance and calculations of the induced stresses and ligament forces during the gait cycle.

Published
2010

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