الفهرس 
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Abstract
The present study conducted on 15 dogs. The study aimed to evaluate the usefulness of two locally designed distractors (extramedullary and external distractors) for management of bony deficiencies. The extramedullary distractor was applied on 3 groups of dogs (3 dogs each). They were classified according to the distraction period (5, 10 and 20 days) 1mm/day with fixed time 2 months after the distraction period. The external distractor was applied on 2 groups of dogs (3 dogs each) according to presence or absence of intramedullary nail. The extramedullary distractor achieved osteogenesis with a good vertical height 0.5cm, 1 cm and 2 cm according to the group. Histologically, active bone deposition had been seen at the distracted areas. As the distance of the distraction increases, bone deposition becomes more. The external distractor showed instability and the animals tried to remove it, so displacement of the two fracture segments. The external distraction needs more veterinarian care to prevent additional damage to animal/device.