Med Biol Eng Comput - Ability of modal analysis to detect osseointegration of implants in transfemoral amputees: a physical model study.

Tópicos

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Resumo

Owing to the successful use of non-invasive vibration analysis to monitor the progression of dental implant healing and stabilization, it is now being considered as a method to monitor femoral implants in transfemoral amputees. This study uses composite femur-implant physical models to investigate the ability of modal analysis to detect changes at the interface between the implant and bone simulating those that occur during osseointegration. Using electromagnetic shaker excitation, differences were detected in the resonant frequencies and mode shapes of the model when the implant fit in the bone was altered to simulate the two interface cases considered: firm and loose fixation. The study showed that it is beneficial to examine higher resonant frequencies and their mode shapes (rather than the fundamental frequency only) when assessing fixation. The influence of the model boundary conditions on the modal parameters was also demonstrated. Further work is required to more accurately model the mechanical changes occurring at the bone-implant interface in vivo, as well as further refinement of the model boundary conditions to appropriately represent the in vivo conditions. Nevertheless, the ability to detect changes in the model dynamic properties demonstrates the potential of modal analysis in this application and warrants further investigation.

Resumo Limpo

owe success use noninvas vibrat analysi monitor progress dental implant heal stabil now consid method monitor femor implant transfemor ampute studi use composit femurimpl physic model investig abil modal analysi detect chang interfac implant bone simul occur osseointegr use electromagnet shaker excit differ detect reson frequenc mode shape model implant fit bone alter simul two interfac case consid firm loos fixat studi show benefici examin higher reson frequenc mode shape rather fundament frequenc assess fixat influenc model boundari condit modal paramet also demonstr work requir accur model mechan chang occur boneimpl interfac vivo well refin model boundari condit appropri repres vivo condit nevertheless abil detect chang model dynam properti demonstr potenti modal analysi applic warrant investig

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