Ísis dos Santos Dal-Bó

Microplacas de titânio em fraturas de tibiotarso em pombos domésticos

Among the surgical problems in birds, the fractures are the most prevalent. Due to variations in size, weight, peculiar bone anatomy, high incidence of complicated fractures and functional demands of different species and individuals, it is still not possible to establish an ideal method for osteosynthesis of long bones in birds. Titanium microplates commonly used in human maxillofacial surgery have been recently employed in osteosynthesis of birds, but with few results available. The aim of this study was to evaluate the use of titanium microplates in the treatment of tibiotarsus fractures in 30 pigeons (Columba livia) , adult males and females, with 7 months old, weighing from 400 to 500. The animals were divided into 3 groups with ten animals each. In group 1, a titanium microplate with 6 holes and a central spacer was used; in group 2, a titanium microplate with 8 holes without a spacer in the center was used; in group 3, a titanium microplate with 8 holes with central spacer was used. After clinical evaluation, the birds were submitted to mid-diaphyseal osteotomy in the right bone for placement of different configurations of the titanium plate, and fixed with titanium microscrews 7mm long. The animals were evaluated clinically and radiographically until 90 days postoperatively. After this period, euthanasia was performed in 2 animals from each group. In all animals was observed bone healing and in group 1 the mean and standard deviation were 32.9±9.9 days, in group 2, 30.8±6.7 days in group 3, 26.6±6.4 days. There was no statistical difference in healing time between groups. The bending of the implant was the most common complication. The configuration of the plate resulted in a statistically significant difference in relation to walking and to the degree of bending in the different groups. Moreover, in group 3 there was higher precocity in the member suppor and a lower degree of bending in relation to other groups. Histologically, it was verified formation of the callus in all animals and presence of bone tissue around the plate and microscrews. Despite the complications of titanium microplates, they are an option for tibiotarsus osteosynthesis in birds of medium size.

Osteossíntese de tibiotarso com miniplaca de titânio em Arara Canindé (Ara ararauna)

Among the surgical problems of birds, fractures are the most prevalent, and the long bones of the wings and pelvic limbs are the most frequently affected. The success of orthopedic surgery in birds is directly related to the techniques used to undo the mechanical forces of a fracture. At the veterinary teaching hospital a psitacid from the Ara ararauna (blue-and-yellow-macaw) species with a clinical history of trauma in the cage was treated. Craniocaudal and lateral radiographs of the left limb demonstrated a mid-diaphyseal fracture of the tibiotarsus. The bird was sent to surgery. The patient was anesthetized with isufluorane and for the pre-anesthesic medicacion methadone was administrated. A medial surgical approach to the tibiotarsus was made and fracture reduction was performed. The fracture was stabilized through a titanium miniplate (system 2mm) fixed medially on the tibiotarsus with 6 cortical miniscrews, being 3 proximal and 3 distal to the fracture site. In this case, there was no complication in placing the miniplate and miniscrews, resulting in a satisfactory alignment of the fragments and causing an efficient reduction of the diaphyseal fracture of tibiotarsus with functional return of the limb and bone consolidation.

Osteossíntese de tíbia com fixador esquelético externo em um cordeiro

Entre os avancos que a clinica e cirurgia veterinaria apresentaram nos ultimos anos, o tratamento de fraturas em grandes animais pode ser citado como um exemplo. A experiencia, consolidada em outras especies de menor porte, permite a tentativa de extrapolar a mesma para as especies de maior porte, adequando-se sempre as caracteristicas e particularidades de cada especie. Atualmente, devemos considerar o tratamento de fraturas de animais de producao como uma forma de evitar o seu descarte, uma vez que, quando se trata de um animal reprodutor, devemos ter a opcao de trata-lo ao inves de decidir pela eutanasia. O presente estudo relata um caso de fratura transversa de diafise de tibia de membro posterior esquerdo em um cordeiro sem raca definida, com duas semanas de idade, com historico de pisoteamento por um bovino. Foi utilizada fixacao esqueletica externa tipo II para a osteossintese, obtendo-se eficiente estabilizacao da fratura. O animal ficou hospitalizado durante todo o periodo de pos-operatorio e a consolidacao ossea foi obtida em 30 dias.