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 22 for “"Micromotion"”.
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Cementless Tibial Base Micromotion During Activities of Daily Living
… activities of daily living generate tibial micromotion yields insight into surgical technique considerations, and rehabilitation strategies post-operatively. ASTM F3141-15, which specifies knee flexion, Internal-External moment, Medial-Lateral, Anterior-Posterior and Superior-Inferior forces …
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Sensitive, 3D micromotion compensation in a surface-electrode ion trap
… in a fast, driven motion of the ion (known as micromotion) which hinders quantum operations by broadening transitions and causing decoherence. In a surface trap, micromotion detection is difficult as the laser beams used for measurement typically cannot crash into the trap, obscuring ion …
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Characterizing hydrogel imposed strain fields on brain tissue phantom for use in neural implant device coatings in presence of micromotion
… of the implant treatment. Constant relative micromotion between the mechanically mismatched neural implant and brain tissue is thought to play a key role glial scar formation. This study investigated the effects of poly(ethylene glycol) (PEG) hydrogel coatings for glass brain implant devices …
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Validation and Analysis of Model-Predicted Patellar Implant-Synthetic Bone Relative Motion in Cementless Total Knee Replacement During a Single-Leg Lunge
… however, few cementless patellar implant micromotion tests have been developed. Previous studies were all focused on qualifying tibial micromotion, experimentally measuring relative motion between the tray and bone or computationally predicting micromotion at the tibial tray-bone interface …
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The Effect of a Medial Collar on the Initial Stability of a Cementless Primary Femoral Hip Prosthesis
… In the absence of adequate initial stability, micromotion between the prosthesis and the proximal endosteal femoral bone will result in partial fibrous encapsulation of the prosthesis, rather than direct bony apposition. Long-term survivorship of the prosthesis may suffer as a result of the …
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A biocompatible, local drug delivery platform for the chronic treatment of neurological disorders of the brain
… scar formation from a materials perspective. Micromotion and mechanical mismatch are thought to be key drivers of scar formation. This hypothesis was investigated using a novel 3D in vitro glial scar model, which replicates the magnitude and frequency of micromotions that are observed in vivo. …
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Biomechanical assessment of RTSA functional outcomes towards optimising the prosthesis configuration
… optimised configurations on muscle fatigue and micromotion at the bone-implant interface were made. Muscle fatigue was assessed by adapting the NSM, and micromotion was assessed through a finite element analysis of a subset of the reverse shoulder cohort. The optimised configuration had a …
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A study on stability of an all polyethylene pressfit acetabular cup
… cups need time for bone ongrowth and therefore micromotion has to be minimized. Mathys Orthopaedics Ltd released in 2002 the first titanium-coated pressfit polyethylene monobloc acetabular cup, which promises similar characteristics to bone, and therefore reduced micromotion and enhanced …
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Probabilistic finite element analysis of the uncemented total hip replacement
… true when looking at the maximum nodal micromotion. The micromotion results compared well with previous studies, confirming the reliability and accuracy of the probabilistic finite element model (PFEM). Results were often influenced by the bone, suggesting that variability in bone …
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Primary stability in cementless total hip replacement: measurement techniques and aided-surgery
… stability of a cementless stem, by measuring the micromotion of the last rasp used by the surgeon to prepare the femoral canal. This information would be really useful to the surgeon, who could check prior to the implantation process if the planned stem size can achieve a sufficient degree of …
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Shuttling of ions for characterization of a microfabricated ion trap
… control, I present initial results for a lock-in micromotion detection method which minimizes stray fields around an ⁸⁸Sr+ ion using Fourier analysis on the ion fluorescence to detect resonance at the secular frequencies. This method drives the ion oscillator across resonance using a superimposed …
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ION TRAP SYSTEM TOWARDS 176LU+ 3D2 CLOCK TRANSITION
… long Ramsey interrogation time, improved excess micromotion compensation, and precise characterization of trap rf magnetic field contributing to the ac Zeeman shift. The second part presents an evaluation of 3D2 systematics and the 3D2 g-factor measurements with a relative inaccuracy of 10-7. The …
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Effect of Mini-implant Diameters on Primary Stability and Viscoelastic Migration of Mini-implants under Orthodontic Loading
… more complications may be produced due to the micromotion at the immediate loading after implantation.
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An Investigation of the Mechanical Implications of Sacroplasty Using Finite Element Models Based on Tomographic Image Data
… that injection of cement reduces fracture micromotion, thus relieving pain. In this study, finite element models were used to examine the mechanical effects of sacroplasty. Finite element models were constructed from CT images of cadavers on which sacroplasties were performed. The images …
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Investigation of a heirarchical collagen scaffold/3D printed lattice structure designed for use in total knee replacements
… condition is exacerbated by stress shielding and micromotion at the bone/implant interface. Stress shielding can be reduced using implant materials with a similar modulus to that of the surrounding bone, such as Ultra High Molecular Weight Polyethylene (UHMWPE). Micromotion is reduced by improved …
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Allograft bone in hip revision: the effect of locally applied pharmacological treatment.
… and after 3 and 12 months, to measure implant micromotion. Bone density and implant motion were similar in both groups and no significant differences were found. In conclusion, we found that local administration of bisphosphonate is effective in inhibiting bone graft resorption in animal models …
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Surface modification of traditional and bioresorbable metallic implant materials for improved biocompatibility
… wall that can accelerate neointimal hyperplasia. Micromotion can lead to the formation of fibrous tissue surrounding an orthopedic implant, loosening, and ultimately failure of the implant. Nanoscale features were created on the surfaces of noble metal coatings, silicon, and bioabsorbable …
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<strong>A Fractional Zener Constitutive Model to Describe the Degradation of Swine Cerebrum with Validation from Experimental Data and Predictions using Finite Element Analysis</strong>
… the cerebral cortex attributed to longitudinal micromotion. Increasing the electrode coating thickness decreased the strain in the brain. The FE study also showed that the maximum electrode displacement and the effect of microelectrode adhesion to the brain on the resulting strain distributions …
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Numerical and experimental studies on the mechanical behaviour of the distal femur following total knee arthroplasty
… the influence of femoral component design on micromotion at the interface. These models showed that all primary implants were subject to similar magnitudes of relative motion at the interface, however, the distinct internal implant features led to very different regional variations. …
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