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The goal of this study is showing the effects of bone mass density and bone-implant interface characteristics on maximum stress in mandible bone. A 3D nonlinear finite element analysis has been done on a planted titanium cylindrical implant with frictional contact of bone-implant interface. Considering the coulomb frictional contact, maximum Von Misses stress increases in cancellous bone, prominently...
We describe an ELECTRONIC SPEAKING GLOVE, designed to facilitate an easy communication through synthesized speech for the benefit of speechless patients. Generally, a speechless person communicates through sign language which is not understood by the majority of people. This final year project is designed to solve this problem. Gestures of fingers of a user of this glove will be converted into synthesized...
Among factors to contribute for the primary implant stability are implant design parameters as well as implant body surface condition. Through this study, the stress distribution within bone around implant will be investigated under variation of implant lengths and surface conditions by using three dimensional finite element analysis. Six finite element models involving three different zygomatic implant...
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...
A high flex knee implant has been designed using a current generation computer modeling software and it's kinematic analysis was studied in sagittal plane by creating a kinematic analysis model in motion analysis software. The model includes femoral component, tibia component and tibia insert. Effect of soft tissue was considered the same with it is reported in literature and Effect of friction is...
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...
A five-fingered, multi-sensory biomechatronic hand with sEMG interface is presented. The cambered palm is specially designed to enhance the stability while grasping. The location of the thumb is designed by maximizing interaction area between the thumb and other fingers. The opposite thumb could grasp along a cone surface, while maintaining its function. By taken the advantage of coupling linkage...
Understanding the spatial dimensionality and temporal context of human hand actions can provide representations for programming grasping actions in robots and inspire design of new robotic and prosthetic hands. The natural representation of human hand motion has high dimensionality. For specific activities such as handling and grasping of objects, the commonly observed hand motions lie on a lower-dimensional...
There is substantial evidence that it is possible to predict movement intentions from single cells recording in monkeys. Such predictions, using decoding algorithms, have a large potential for clinical applications for paralyzed patients or amputees. In spite of these advances, it is however not clear how accurate and practical the movements obtained from real neuronal devices could be. In this work,...
Plates with angular stability (monoaxial or polyaxial) are competing for indications in periarticular fractures of the long bones, consisting, according to most authors, the ideal treatment at present time. However, the best option for screw locking is controversial and insufficient investigated. The authors present their personal experience regarding angular stability plate osteosynthesis for the...
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...
Management of articular cartilage defects is still one of most challenging problems between orthopedic surgeons. There are some methods which are claiming to restore cartilage around defects but none is capable to restore 100% hyaline cartilage. It is well known that hyaline cartilage has a poor intrinsec capacity of healing and damage from knee trauma or degeneration results in pain and functional...
Acromioclavicular joint (ACJ) dislocation is a common injury, often affecting young adults. Complete disruption of the ACJ (Rockwood IV and V) is an indication for operative care, especially in active people. A variety of arthroscopic techniques are used to treat such lesions, however, we will elaborate on one case that was operated in our department, using the TightRope® System (Arthrex®, Naples,...
Objective: The purpose of this study was to evaluate the mechanical behavior of three different types of implants used in the osteosynthesis of comminuted humeral shaft fractures. Materials and methods: We used 16 Sawbones® composite synthetic bones. We created a medial third osteotomy and we removed a 38mm thick fragment. We instrumented the fractures with 3 types of implants: an intramedulary nail,...
The following topics are dealt with: biomechanics; prosthetics; osteosynthesis; bone defects; biomaterials; tissue engineered scaffolds; mobile robot; implants.
Distal radius fractures are typical and frequent fracture of elderly woman with reduced bone density. The angle stable plate, often also multidirectional is today the most common stabilisation device. Because of the introduction of bulky and bended implants as the Micro nail or Targon DR which require difficult opening of the bone with awles we decided to test the XS radius (XSR) nail which is a 4,5mm...
Pilon fractures and distal metaphyseal fractures of the tibia are associated with a high rate of soft tissue and bone healing problems, especially in type C fractures. From July 2000, the authors started to use XS and XXS nail, first for fibula and then for pilon and ankle fractures. Material and methods: the XS nail is a 4.5mm and the XXS a 3.5mm straight nail which is locked by threaded wires which...
For operative stabilization of fractures we have the possibility of external fixation, fixation with implants on the bone surface and intramedullary implants. Due to the higher leaver arm length of the femur neck the biomechanical load in the trochanteric and subtrochanteric area is the highest. Therefore the load of the trochanteric area in the one lag stand is 3 times and for the subtrochanteric...
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