Holding power of three different pin designs in the femur and ulna of the common buzzard (Buteo buteo)

Journal of Zoo and Wildlife Medicine : Official Publication of the American Association of Zoo Veterinarians
Mariano López GarcíaAntonio González Cantalapiedra


External skeletal fixation is generally considered the best stabilization technique for immobilizing avian long bone fractures, but one of its major complications is the failure of bone-fixation pin interface or the loss of holding power. Consequently, this study is aimed at elucidating which pin design offers more pull-out strength in certain bones of the common buzzard (Buteo buteo). To achieve this objective, three pin designs (a smooth design and two negative profile threaded designs, with different thread pitch) were placed in five positions along the femur and ulna of the common buzzard. The pin pull-out strength was measured with the purpose of comparing medullary and pneumatic bones, insertion sites, and pin designs. Threaded pins with negative profile showed greater holding power than smooth pins (P < 0.05). When comparing holding power between the ulna and femur, no differences were found for smooth pins, whereas threaded pins showed more pull-out strength in the ulna than in the femur (P < 0.05). There were no differences observed related to pin location along the same bone when considering the same pin type. These results suggest that negative profile threaded pins have more holding power than smooth pins and that p...Continue Reading


Jul 1, 1991·The Veterinary Clinics of North America. Small Animal Practice·E L Egger
Jan 1, 1990·Journal of Wildlife Diseases·A S Fix, S Z Barrows
Oct 1, 1973·Journal of Wildlife Diseases·J E Cooper
Jul 15, 1998·Veterinary Surgery : VS·L A DegernesC F Abrams

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