RESUMO
ABSTRACT The aim of this study was to evaluate the effects of castration on bones in the male guinea pigs and to observe whether mechanical testing correlates with dual-energy X-ray absorptiometry (DXA). Twelve male guinea pigs (Cavia porcellus), aged 21-27 days, and with average initial weight of 279 grams were used. The animals were equally allocated to two groups: GI - orchiectomized animals and GII - intact control animals. They underwent euthanasia at seven months following surgery. DXA measurement was performed at the mid-third of the right femoral diaphysis in the cortical region and at the left femoral neck in order to verify its correlation with results of mechanical testing. Three-point bending test of right femur and axial compression test of left femur were performed. Bone mineral density of GI was significantly lower only at femoral neck. No differences were observed in the maximum load values between GI and GII for both bending and axial compression tests. The bending test revealed lower bone stiffness in GI compared to GII, but in the axial compression test no differences between groups were observed. Only left femur showed positive correlation coefficient between maximum load and bone mineral density according to Pearson"s correlation coefficient. The results suggest that hormonal deprivation in guinea pigs induces reduction of bone mineral density, especiall
RESUMO
ABSTRACT The aim of this study was to evaluate the effects of castration on bones in the male guinea pigs and to observe whether mechanical testing correlates with dual-energy X-ray absorptiometry (DXA). Twelve male guinea pigs (Cavia porcellus), aged 21-27 days, and with average initial weight of 279 grams were used. The animals were equally allocated to two groups: GI - orchiectomized animals and GII - intact control animals. They underwent euthanasia at seven months following surgery. DXA measurement was performed at the mid-third of the right femoral diaphysis in the cortical region and at the left femoral neck in order to verify its correlation with results of mechanical testing. Three-point bending test of right femur and axial compression test of left femur were performed. Bone mineral density of GI was significantly lower only at femoral neck. No differences were observed in the maximum load values between GI and GII for both bending and axial compression tests. The bending test revealed lower bone stiffness in GI compared to GII, but in the axial compression test no differences between groups were observed. Only left femur showed positive correlation coefficient between maximum load and bone mineral density according to Pearson"s correlation coefficient. The results suggest that hormonal deprivation in guinea pigs induces reduction of bone mineral density, especiall
RESUMO
The aim of this study was to compare bone healing and limb function in 18 cats with transverse femoral fractures treated with either intramedullary pin and a type Ia external skeletal fixator (Group 1, n=9) or a tie-in configuration (Group 1, n=9). All animals showed normal function of the operated limb after implant removal, independently of the configuration used. The optic bone densitometry in radiographic images showed no difference in bone mineral density of the external bone callus between the groups. Fractures treated with intramedullary pin and type Ia external fixator had significantly more time to fracture healing, and fractures treated with the tie-in configuration had less proliferation of bone callus.
O trabalho teve por objetivo comparar a consolidação óssea e a função do membro, em 18 gatos com fraturas transversas femorais tratadas com pino intramedular e fixador esquelético externo tipo Ia (grupo I, n=9) ou com pino intramedular associado ao fixador externo em uma configuração "tie-in" (grupo II, n=9). Independente da configuração utilizada, após a remoção dos implantes, todos os animais apresentaram função normal do membro operado. Não houve diferença entre os grupos em relação à densidade mineral óssea do calo externo mensurada pela densitometria óptica por imagens radiográficas. O tempo para consolidação foi significativamente maior para as fraturas tratadas com pino intramedular e fixador tipo Ia. As fraturas que receberam a configuração "tie-in" tiveram menos proliferação de calo ósseo.
RESUMO
The aim of this study was to compare bone healing and limb function in 18 cats with transverse femoral fractures treated with either intramedullary pin and a type Ia external skeletal fixator (Group 1, n=9) or a tie-in configuration (Group 1, n=9). All animals showed normal function of the operated limb after implant removal, independently of the configuration used. The optic bone densitometry in radiographic images showed no difference in bone mineral density of the external bone callus between the groups. Fractures treated with intramedullary pin and type Ia external fixator had significantly more time to fracture healing, and fractures treated with the tie-in configuration had less proliferation of bone callus.
O trabalho teve por objetivo comparar a consolidação óssea e a função do membro, em 18 gatos com fraturas transversas femorais tratadas com pino intramedular e fixador esquelético externo tipo Ia (grupo I, n=9) ou com pino intramedular associado ao fixador externo em uma configuração "tie-in" (grupo II, n=9). Independente da configuração utilizada, após a remoção dos implantes, todos os animais apresentaram função normal do membro operado. Não houve diferença entre os grupos em relação à densidade mineral óssea do calo externo mensurada pela densitometria óptica por imagens radiográficas. O tempo para consolidação foi significativamente maior para as fraturas tratadas com pino intramedular e fixador tipo Ia. As fraturas que receberam a configuração "tie-in" tiveram menos proliferação de calo ósseo.
RESUMO
PURPOSE: Assessment of ulnar osteotomy healing in rabbits treated with ketoprofen, by image analysis softwares. METHODS: The rabbits were submitted to ulnar osteotomy and divided in 2 groups. Group A (n=10) was treated with ketoprofen (2mg.kg-1) during 5 days. Group B (n=5) was the control. Radiographs were taken one day after the surgery and then every each 7 days until a total of 28 days. An aluminum step wedge and an aluminum wedge were placed at the osteotomy site to serve as optical densitometry references. The radiographic images were scanned and processed with ODR software in order to obtain tridimensional and color images. Next, the average radiographic density in the area of the osteotomy was quantified using CROMOX software. RESULTS: The radiographic images processed through ODR software resulted in a better visualization of the lesion and bone healing. Additionaly, CROMOX software allowed quantitative analysis of the osseous callus density along the 28 days of observation. We have observed no statistical significant diference between the values of osseous density of the ulnar osteotomy from ketoprofen-treated rabbits and the controls, in the radiographs taken during the 28 days of postoperative. CONCLUSION: Taken together our results have shown that treatment with ketoprofen does not impair ulnar osteotomy healing in rabbits.
OBJETIVO: Acompanhar o processo de consolidação óssea de ulnas osteotomizadas de coelhos tratados com cetoprofeno, por meio de programas computacionais. MÉTODOS: Os coelhos foram submetidos a osteotomia da ulna e divididos em dois grupos. No grupo A (n=10) os animais foram tratados com cetoprofeno (2mg.kg-1) durante cinco dias. O grupo B (n=5) serviu como controle. Os animais foram radiografados um dia após a operação e a cada 7 dias até perfazer 28 dias. No ato da tomada radiográfica, junto à região a ser estudada, foram colocadas uma escada e uma cunha de alumínio que serviram como referencial de densidade óptica. As imagens radiográficas foram digitalizadas através de um "scanner". O programa ODR forneceu imagens tridimensionais e coloridas. Outro programa, CROMOX, avaliou a densidade mineral óssea da região da ostetotomia. RESULTADOS: As imagens fornecidas pelo ODR proporcionaram melhor visualização da lesão e do processo de consolidação óssea. O programa CROMOX forneceu uma análise quantitativa ao calcular a densidade mineral do calo ósseo formado ao longo dos 28 dias de observação. Não houve diferença estatisticamente significante entre os valores de densidade mineral óssea das ulnas osteotomizadas dos coelhos tratados com cetoprofeno e do grupo controle, nas radiografias realizadas ao longo de 28 dias de pós-operatório. CONCLUSÃO: O cetoprofeno não interferiu no processo de formação do calo ósseo de ulnas osteotomizadas de coelhos.