RESUMO
OBJECTIVE:: To compare ultrasound propagation velocity with densitometry in the diaphyseal compact cortical bone of whole sheep metatarsals. METHODS:: The transverse ultrasound velocity and bone mineral density of 5-cm-long diaphyseal bone segments were first measured. The bone segments were then divided into four groups of 15 segments each and demineralized in an aqueous 0.5 N hydrochloric acid solution for 6, 12, 24 or 36 hours. All measurements were repeated after demineralization for each time duration and the values measured before and after demineralization were compared. RESULTS:: Ultrasound velocity and bone mineral density decreased with demineralization time, and most differences in the pre- and post-demineralization values within each group and between groups were significant: A moderate correlation coefficient (r=0.75956) together with a moderate agreement was determined between both post-demineralization parameters, detected by the Bland-Altman method. CONCLUSION:: We conclude that both ultrasound velocity and bone mineral density decrease as a result of demineralization, thus indicating that bone mineral content is of great importance for maintaining the acoustic parameters of cortical bone, as observed for cancellous bone. Ultrasound velocity can be used to evaluate both compact cortical bone quality and bone mineral density.
Assuntos
Técnica de Desmineralização Óssea , Osso Cortical/diagnóstico por imagem , Densitometria , Osteoporose/diagnóstico por imagem , Ultrassonografia/métodos , Animais , Densidade Óssea , Osso Cortical/fisiopatologia , Ossos do Metatarso/diagnóstico por imagem , Ossos do Metatarso/fisiopatologia , Osteoporose/fisiopatologia , Ovinos , Fatores de TempoRESUMO
OBJECTIVE: To compare ultrasound propagation velocity with densitometry in the diaphyseal compact cortical bone of whole sheep metatarsals. METHODS: The transverse ultrasound velocity and bone mineral density of 5-cm-long diaphyseal bone segments were first measured. The bone segments were then divided into four groups of 15 segments each and demineralized in an aqueous 0.5 N hydrochloric acid solution for 6, 12, 24 or 36 hours. All measurements were repeated after demineralization for each time duration and the values measured before and after demineralization were compared. RESULTS: Ultrasound velocity and bone mineral density decreased with demineralization time, and most differences in the pre- and post-demineralization values within each group and between groups were significant: A moderate correlation coefficient (r=0.75956) together with a moderate agreement was determined between both post-demineralization parameters, detected by the Bland-Altman method. CONCLUSION: We conclude that both ultrasound velocity and bone mineral density decrease as a result of demineralization, thus indicating that bone mineral content is of great importance for maintaining the acoustic parameters of cortical bone, as observed for cancellous bone. Ultrasound velocity can be used to evaluate both compact cortical bone quality and bone mineral density.
Assuntos
Animais , Osteoporose/diagnóstico por imagem , Ultrassonografia/métodos , Técnica de Desmineralização Óssea , Densitometria , Osso Cortical/diagnóstico por imagem , Osteoporose/fisiopatologia , Fatores de Tempo , Ovinos , Ossos do Metatarso/fisiopatologia , Ossos do Metatarso/diagnóstico por imagem , Densidade Óssea , Osso Cortical/fisiopatologiaAssuntos
Dedos/anormalidades , Gigantismo/fisiopatologia , Deformidades Congênitas dos Membros/diagnóstico por imagem , Deformidades Congênitas dos Membros/fisiopatologia , Dedos do Pé/fisiopatologia , Dedos/diagnóstico por imagem , Dedos/fisiopatologia , Gigantismo/diagnóstico por imagem , Humanos , Recém-Nascido , Masculino , Ossos do Metatarso/diagnóstico por imagem , Ossos do Metatarso/fisiopatologia , Radiografia , Dedos do Pé/diagnóstico por imagemRESUMO
This study pretend to establish the anthropometric relationship between the position of osseous prominences (metatarsal heads, proximal and distal phalanxes bones) of the feet in a group of diabetic patients, and the position of the sensors of the electronic German Parotec insoles system, located in the same areas to register the plantar pressure distribution in standing position by using RXs. The aims of this study were: a) to establish the position of the centres of the sensors of the Parotec insoles related to the centres of the metatarsal heads and distal ends of the proximal phalanges and the proximal ends of the distal phalanges phalanxes of the feet, in a group of 12 diabetic subjects wearing different type of shoes, by means of radiological records, in order to answer the following questions: (1) Can the Parotec insoles designed for registering plantar pressure distribution on diabetic German people be used for measuring pressure distribution on a group of 12 diabetic type 1 and type 2 Colombian people evaluated in this study? (2) Are those bones landing according to the Parotec sensor position? (3) Which would be the proper distribution of the Parotec sensors for this group of subjects? b) To establish if the use of different types of footwear (sports, conventional and orthopaedic footwear) with the Parotec electronic insoles can influence the position of the osseous prominences in relation to the position of the sensors that register the pressure in these areas.