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One of the most common spinal fractures is thoracolumbar spine fracture and in this area burst fracture contributed approximately 10%-20% of such spinal problems. The purpose of this study is to investigate biomechanical effects of anterior decompression and posterior instrumentation and evaluate the role of short-segment pedicle screw instrument in order to preservation of adequate spine stability...
One of the basic principles for internal fixation is the achievement of stable construct for proper bone healing. Locking compression plate (LCP) achieved it through locking screws that create a fixed-angle construct providing angular stability. The plate and screws combination to construct a stable fixation depends on factors such as the type of fracture and surgical preference. The optimum combination...
In this paper, effect of the implant thread profile on the stability and osseointegration at the peri-implant bone were evaluated by finite element analysis. These study include five different common threads profile of implant body - buttress, reverse buttress, V-shape, sinusoidal and square - that were evaluated via finite element analysis. Three dimensional model of a mandible was reconstructed...
Instability is one of the symptoms associated with Rheumatoid Arthritis of the wrist joint. The instability which is caused by weakened ligaments as well as worn cartilages makes the carpal bones to move freely, causing a painful condition. Wrist arthroplasty is one of the treatments for severe cases of Rheumatoid Arthritis of the wrist joint. This project involved biomechanical analysis of wrist...
This paper establishes parametric model of the bioprosthetic heart valve via computer aided design. Dynamic finite element analysis is used along with a geometrically accurate model of the bioprosthetic heart valve. The stress distribution of cylindrical and paraboloidal valve leaflets under the same load is analyzed as the leaflets are closed. The finite element analysis results show that the stress...
The “natural history” of aortic aneurysm formation and growth is not fully understood. Mouse models are most suitable to unravel the potential role of biomechanical factors (such as magnitude and patterns of wall shear stress), which are thought to interplay with vascular biology. The objective of this study is to explore whether high-frequency ultrasound imaging, combined with computational fluid...
This paper presents a gradient-free direct search estimation method by using genetic algorithm to model and predict the elastic stress response of ligament based on quasi-linear viscoelastic (QLV) theory. An improved genetic algorithm is developed to simultaneously fit the ramping and relaxation experimental data to the QLV constitutive equation for obtaining soft tissue parameters in a time-saving...
Advanced bioreactors are essential for meeting the complex requirements of in vitro ligament tissue engineering. A novel bioreactor system for the functional tissue engineering of ligaments, combined with culture medium perfusion over long periods of time and capability to apply cyclic mechanical loadings to three-dimensional scaffolds independently housed in six chambers, was developed. Well-controlled...
Ligaments in the knee that connect the femur to the tibia are often torn during a sudden twisting motion, which results in instability in the knee. In such cases ligament repair surgery may be an effective treatment where the ligament involved is replaced with a piece of healthy tendon which is grafted into place to hold the knee joint together. A novel device for use in knee ligament repair surgery...
Vision and speech are the two natural ways of human communication. The major challenge is to create reliable perceptual technologies that allow applications of communication with multiple modalities. There are many options for restoring this function and, human machine interface is one of its kinds, which is the focus of the present work. This paper presents the design and development of a human-computer...
Rapid Prototyping technologies allow fabrication of lattice structures made of biocompatible materials. The natural stress distribution in the femur is altered after total hip arthroplasty (THA) because the hip end prosthesis will assume a part of the load causing a reduction of stresses in some regions of the bone. This phenomenon is known as stress shielding and it results in a loss of bone mass...
Deviations from nominal alignment of unicondylar knee replacements impact knee biomechanics, including the load and stress distribution at the articular contact surfaces. This study characterizes relationships between the biomechanical environment, distinguished by progressive changes in alignment and fixation, and articular damage and deformation in a consecutive series of retrieved unicondylar knee...
Closed-form analytical formulas for a tooth of paraboloidal shape under the orthodontic force are presented. These formulas are based on both the approximation of strains according to the displacement of the tooth and the tooth equilibrium of the thin surrounding periodontal membrane. The proposed formulas are capable of determining the most important quantities involved the distribution of strain...
Abstract-Objective: To analyze the biomechanical influences on cervical vertebra after the removal of nucleus going with the cervical disc degradation, and to inspect the immediate stability and bone fusion rate with artificial double Cage fusion setting into intervertebral disc.Methods: to establish precisely with CAE method four finite element models as followed: C3-6 normal height disc model, C4-5...
The main purpose of correction craniosynostosis is to reopen cranial sutures with some bone slots in order to free the skull transformation with the brain development from the closed craniums. The intent of this paper is to analysis the relationship between the shapes of bone slots and the skull rigidity. Finite element method is utilized to obtain the stress distribution and deformation clouds of...
Research used non-invasive type of finite element analysis techniques to observe unicompartmental knee arthroplasty in different contact surfaces of tibial components in implanted counterpoint with of state generated of stress situation, surgical treatment for provide a reference. Research was used two different contact surfaces of polyethylene tibial component analysis; impact factors selected include...
Though cartilage tissue is susceptible to damage and difficult to self-repair, cartilage tissue engineering provides an ideal way for the treatment of cartilage defects. Mechanical environments have significant effects on the growth and development of cartilage. The research of mechanical states of repaired articular cartilage by tissue engineering has significantly clinical value. According to the...
The purpose of this study was to assess the time-dependent elastance of the radial arterial wall using a sinusoidal vibration method in room temperature and cold stress conditions. When a tiny sinusoidal displacement with varying frequencies is imposed on the superficial radial artery, its wall elastance can be derived from the reactive force of the wall, and the amplitude and frequency of the small...
The theoretical and finite element models are founded for partial implanted dentures and for the osseous tissues surrounding the dentures implanted in the lower jaw area. The influences of threads type on partial denture repairing are studied. The results indicate that the stress on cortical bone is much larger than cancellous one. The maximum stress occurs at the mesial side of distal implant fixed...
Under the combination of underground mining and open-pit mining, the two excavation bodies interact with each other and the movement of rock mass and surface is in a more complex state, leading to mining damage. This paper, targeting at the east slope of Antaibao Mine with the joint employment of underground mining and open-pit mining, aims to study the moving law of the slope rock mass and the damage...
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