Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 31 for “"implant design."”.
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In vivo knee biomechanics and implications for total knee arthroplasty implant design
… available to support or refute the need for such implants. Therefore, a second goal of this thesis was to investigate similarities and differences between male and female knee kinematics and anatomy, to determine if significant benefits can be obtained by incorporating gender specific variations …
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Computational Methodology for Generating Patient-Specific Soft Tissue Representations
… accuracy and relevance for surgical planning and implant design. The second study tackled the challenge of expediting the calibration of mechanical properties of the hip capsule to match patient-specific laxities. A statistical shape function model was proposed to generate patient-specific finite …
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Factors Affecting the Primary Stability of the Intraosseous Screw Type Implants /// Фактори повлияващи първичната стабилност на интраосалните винтови имплантати
… this study was to establish the influence of the implant design, diameter, length, thread pitch and surface modification on the primary stability and on the heat generation at the marginal bone area during the implant insertion. Assessment of the primary stability of implants of different forms …
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Development of a chronically implanted microelectrode array for intraneural electrical stimulation for prosthetic sensory feedback
… nerve in the stump of the amputee. lntraneural implants of several designs were developed and implanted in rabbit animal models and monitored for chronic functionality evaluated using both neurophysiological and behavioral tests. Animal studies have demonstrated single channel implant …
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Development of an Artificial Meniscus Implant
… of this thesis developed an artificial meniscus implant with a similar shape, strength, compliance, and contact mechanics as the natural meniscus. Previous work on this implant showed that PVA gave the desired compressive properties and reinforcing Kevlar fibers had the desired strength. These …
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Various continuum bone remodelling algorithms applied to the proximal femur in two and three dimensions
… is important in fields such as orthopaedics and implant design. Various models of bone remodelling are discussed, and a strain energy based as well as a strain remodelling based algorithm are applied in two and three dimensions. Properties such as dependence on initial conditions, development of …
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Investigation of bone response to implant materials by electron microscopy and computer simulation
… with previous result by other people. Different implants were introduced to simulate the replacement for the femoral head. It has been proved that the difference in Young's modulus between bone and implant materials is the main reason for the long-term bone loss (stress screening). This problem …
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Knee Balance Assessment During Cementation Is Detrimental to Initial TKA Tibial Tray Fixation
<p>Despite recent advancements in implant design and cement technique, aseptic tibial loosening remains the primary cause of revision after cemented total knee arthroplasty (TKA) [1]. While the mechanisms of tibial loosening are multifactorial, previous research has shown that third-generation …
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Effects of Reamer-Femoral Component Offset on Cement Mantle Penetration in Hip Resurfacing Arthroplasty
… there are varying clinical approaches to implant design selection and cementation techniques. The purpose of this project is to determine what amount of reamer-femoral component offset allows for the best cement penetration into the femoral head. Rapid prototyped femoral component models …
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Multi-scale structural design of titanium implants for improved osseointegration
Osseointegration success of bone-interfacing implants is reduced for many compromised patients, necessitating improved implant design. Though material and mechanical properties of titanium make it attractive for load-bearing dental and orthopaedic implants, limited advancements have been made to …
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Statistical Shape Modeling to Quantify Variation in the Proximal Humeral Anatomy
… gender and ethnicity, with a goal of informing implant design. An SSM was used and Principal Component Analysis (PCA) was applied to data that represented both the cancellous and cortical humeral bone of 63 healthy subjects and cadavers. Anatomical measurements and PC scores were analyzed by …
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An Exploration into the Relationship between Knee Shape and Kinematics Before and After Total Knee Replacement
The knee joint is unique in its design and it is thought that its articular shape is the main driver of biomechanical behaviour. Although the shape of the bony knee is acknowledged to change with osteoarthritis, the specific relationship between shape changes and function is not well understood. …
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An Exploration into the Relationship between Knee Shape and Kinematics Before and After Total Knee Replacement
The knee joint is unique in its design and it is thought that its articular shape is the main driver of biomechanical behaviour. Although the shape of the bony knee is acknowledged to change with osteoarthritis, the specific relationship between shape changes and function is not well understood. …
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Development of Precision 3D-Printed Medical Implants
… Additionally, aseptic loosening, a common implant failure cause, necessitates arthroplasty revisions. Metal 3D printing enables complex porous implants that enhance osseointegration, reducing aseptic loosening risks. Furthermore, in this research, the osteogenic responses to pre-designed …
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A new metacarpophalangeal joint replacement arthroplasty
… cases the diseased joint is replaced with an implant. The past and current metacarpophalangeal joint replacements can be divided into three main categories: hinge implants, flexible implants and surface replacement implants. There is some frustration among hand surgeons as these implants fail …
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Total Knee Arthroplasty Wear Is Caused by Malrotation and Excessive Laxity
… is a proven technique which combines specially designed components and surgical processes to treat cartilage degeneration and alleviate pain in arthritic knees. However, this technique is limited by component design and surgical precision. Due to these limitations, knee arthroplasty components …
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Multi-objective design optimization of reverse total shoulder arthroplasty to maximize range of motion and joint stability
… range of indications, the effects of varying its design on functional outcomes of the procedure are still not well understood.</p> <p>To that end, it is not yet clear which configurations, in terms of both design and surgical placement parameters, maximize range of motion and stability of the …
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Explicit Finite Element Modeling of Knee Mechanics During Simulated Dynamic Activities
… can affect patient satisfaction and long-term implant performance. The work presented in this dissertation is a demonstration of how anatomic three-dimensional (3D) computational knee models can be an effective alternative for investigating knee mechanics when compared to the cost and time …
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Evaluation of Stress and Fatigue in Femoral Hip Implants
<p>To expedite the design cycle of a device within new product development, an accurate theoretical assessment of fatigue life is critical. In order for a femoral implant design to be launched to the market, fatigue testing is required by regulatory bodies as evidence of the implant strength to …
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ASSESSMENT OF PERI-IMPLANT BONE MICROARCHITECTURE IN D4 BONE: AN EX VIVO MICROCT ANALYSIS
… study aimed to evaluate the impact of different implant designs on primary stability, peak insertion torque (PIT), implant stability quotient (ISQ), and peri-implant bone microarchitecture in low-density bone (D4). The investigation focused on three Straumann implant systems: Bone Level Tapered …
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