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SENOS, R. The use of nandrolone decanoate in experimental nonunion fracture of the femur of the rat: morphological aspects. [Uso do decanoato de nandrolona na não-união de fratura induzida em fêmur de rato: aspectos morfológicos]. 2014. 88 f. Tese (Doutorado em Ciências) – Faculdade de Medicina Veterinária e Zootecnia, Universidade de São Paulo, São Paulo, 2014. The nonunion fracture is a relatively frequent complication in both human and veterinary medicine. Among their types, the atrophic nonunion fracture is usually the most difficult to treat and the elective treatment is surgery. In order to search for alternative therapeutic approach, the present study aimed to analyze the morphological changes induced by the use of nandrolone decanoate in experimental nonunion fracture with vascular deficit in the rat model. Ten adult Wistar rats (Rattus norvegicus) were divided into two groups, control (GC) and nandrolone decanoate (GNan). Surgical protocols were developed to promote fracture nonunion in the left femur diaphysis with vascular deficit by removing the periosteum and endosteum and isolating the fracture site using a latex artifact. After the establishment of the nonunion fracture, the GNan was treated with nandrolone decanoate (1.5mg/kg IM, once a week, during 4 weeks). Periodical radiological examinations were performed. In addition, anatomopathological evaluation, scanning electron microscopy, computed micro-tomography and optical microscopy techniques were performed. The results showed that the surgical protocols to establish the nonunion fracture were efficient and allowed qualitative and quantitative evaluation of bone growth. Besides, the nandrolone decanoate promoted the bone regeneration at the nonunion fracture site by raising the osteblastic activity and reducing the osteclastic activity. The percentage of collagen analysis did not reveal significant differences between GC and GNan. This guarantees some quality for the regenerated bone. Due to the economical viability of the use of nandrolone decanoate use, new advanced studies are recommended to prove the therapeutic potential of that anabolic steroid for the treatment of atrophic nonunion fracture in humans and other animals.

<b>Uso do decanoato de nandrolona na não-união de fratura induzida em fêmur de rato:</b> aspectos morfológicos