RESUMO
PURPOSE: To investigate the effect of intermittent vibration at different intervals on bone fracture healing and optimize the vibration interval. METHODS: Ninety sheep were randomized to receive no treatment (the control group), incision only (the sham control group), internal fixation with or without metatarsal fracture (the internal fixation group), and continuous vibration in addition to internal fixation of metatarsal fracture, or intermittent vibration at 1, 2, 3, 5, 7 and 17-day interval in addition to internal fixation of metatarsal fracture (the vibration group). Vibration was done at frequency F=35 Hz, acceleration a=0.25g, 15 min each time 2 weeks after bone fracture. Bone healing was evaluated by micro-CT scan, bone microstructure and mechanical compression of finite element simulation. RESULTS: Intermittent vibration at 7-day interval significantly improved bone fracture healing grade. However, no significant changes on microstructure parameters and mechanical properties were observed among sheep receiving vibration at different intervals. CONCLUSIONS: Clinical healing effects should be the top concern. Quantitative analyses of bone microstructure and of finite element mechanics on the process of fracture healing need to be further investigated.
Assuntos
Consolidação da Fratura , Fraturas Ósseas , Ossos do Metatarso , Vibração , Animais , Análise de Elementos Finitos , Fixação Interna de Fraturas/instrumentação , Fixação Interna de Fraturas/normas , Consolidação da Fratura/fisiologia , Fraturas Ósseas/diagnóstico por imagem , Fraturas Ósseas/cirurgia , Fraturas Ósseas/terapia , Ossos do Metatarso/diagnóstico por imagem , Ossos do Metatarso/lesões , Ossos do Metatarso/cirurgia , Distribuição Aleatória , Ovinos , Vibração/uso terapêutico , Microtomografia por Raio-XRESUMO
Abstract Purpose: To investigate the effect of intermittent vibration at different intervals on bone fracture healing and optimize the vibration interval. Methods: Ninety sheep were randomized to receive no treatment (the control group), incision only (the sham control group), internal fixation with or without metatarsal fracture (the internal fixation group), and continuous vibration in addition to internal fixation of metatarsal fracture, or intermittent vibration at 1, 2, 3, 5, 7 and 17-day interval in addition to internal fixation of metatarsal fracture (the vibration group). Vibration was done at frequency F=35 Hz, acceleration a=0.25g, 15 min each time 2 weeks after bone fracture. Bone healing was evaluated by micro-CT scan, bone microstructure and mechanical compression of finite element simulation. Results: Intermittent vibration at 7-day interval significantly improved bone fracture healing grade. However, no significant changes on microstructure parameters and mechanical properties were observed among sheep receiving vibration at different intervals. Conclusions: Clinical healing effects should be the top concern. Quantitative analyses of bone microstructure and of finite element mechanics on the process of fracture healing need to be further investigated.
Assuntos
Animais , Vibração/uso terapêutico , Ossos do Metatarso/lesões , Consolidação da Fratura/fisiologia , Fraturas Ósseas/diagnóstico por imagem , Ovinos , Ossos do Metatarso/cirurgia , Ossos do Metatarso/diagnóstico por imagem , Distribuição Aleatória , Análise de Elementos Finitos , Fraturas Ósseas/cirurgia , Fraturas Ósseas/terapia , Microtomografia por Raio-X , Fixação Interna de Fraturas/instrumentação , Fixação Interna de Fraturas/normasRESUMO
Las fracturas nasales son la fractura facial màs comùn.Son responsables de un alto porcentaje de rinoseptumplastìas.
Assuntos
Fixação Interna de Fraturas/normas , Fixação Interna de Fraturas/reabilitação , Fixação Interna de Fraturas , ParaguaiRESUMO
Las fracturas del olecranon han sido tratadas con una gran variedad de metodos incluyendo: el tratamiento de inmovilizacion con yeso, reseccion del olecranon, la reduccion abierta y fijacion con el tornillo de Leibach propuesta por De Palma y otros autores, hasta llegar a la reduccion abierta y osteosintesis dinamica propuesta por la AO, siendo esto ultimo lo realizado en el presente trabajo en 34 pacientes desde 1979, en el Hospital San Ignacio de la Universidad Javeriana. El objetivo principal fue analizar los resultados funcionales del tratamiento de las fracturas del olecranon utilizando el metodo de la osteosintesis dinamica. Los objetivos secundarios fueron: analizar mecanicamente la tecnica y comparar los resultados obtenidos con otros sistemas de tratamiento. Se analizaron los siguientes parametros el pre y postoperatorio; edad, sexo, tiempo transcurrido entre el accidente y la cirugia, tipo de la fractura, seguimiento, movilidad del codo, dolor, tiempo de inmovilizacion, tiempo de consolidacion, estabilidad, fallas tecnicas y complicaciones. En los 34 pacientes obtuvimos resultados funcionales excelentes, por lo tanto creemos que el metodo de la osteosintesis dinamica es el ideal para el tratamiento de las fracturas del olecranon, obteniendo "una movilidad del codo".