Abstract
This research aims to investigate the fracture healing effects caused by thyroidectomy. The experiment involved sixteen matured male rabbits of local breed which divided into 2 equal groups (control and treated). Rabbits anesthetized by premedicated atropine sulphate, then 15 minutes later, a mixture of Xylazine Ketamine was used. The control group rabbits were induced with mid-shafted femoral fracture, with that, the fixation by intramedullary pinning was considered Meanwhile, the treated group rabbits were induced with same method mentioned above, but fracture were fixed after thyroidectomy and measurement of thyroxin a week after thyroidectomy. Results which were obtained from the clinic revealed signs of severe inflammatory reaction in control group which were higher comparing to treated group. These sings were disappeared within 4-5 days in treated group, while, it took 5-6 days in control animals. Also, radiological results of 2 groups showed that a periosteal reaction was observed towards the end of the 2nd week in the control group, whereas, the treated group showed its reaction at the end of fourth week, there was an invisible fracture line for both control and treated groups at the end of fourth and seventh week, respectively. In addition, bony bridge in the control groups became remodeled into a lamellar bone earlier than treated group. The results of measuring thyroxin hormone before and after the thyroidectomy confirmed the essential role of this hormone in fracture healing. To conclude that the fracture healing maturity was greater in control group than in treated group.
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