López García Mariano, López Beceiro Ana M, Valcárcel Juárez Víctor, Muñoz Guzón Fernando, González Cantalapiedra Antonio
Department of Veterinary Clinical Sciences, Faculty of Veterinary, University of Santiago de Compostela, Av. Carvallo Calero, s/n, ZC 27002, Lugo, Spain.
J Zoo Wildl Med. 2011 Dec;42(4):552-7. doi: 10.1638/2009-0194.1.
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 pneumatic bones provide less pull-out strength to negative profile threaded pins than medullary bones.
外骨骼固定术通常被认为是固定禽类长骨骨折的最佳稳定技术，但其主要并发症之一是骨固定针界面失效或固定力丧失。因此，本研究旨在阐明哪种针设计在普通鵟（Buteo buteo）的某些骨骼中具有更大的拔出强度。为实现这一目标，将三种针设计（一种光滑设计和两种负型螺纹设计，具有不同的螺距）沿普通鵟的股骨和尺骨放置在五个位置。测量针的拔出强度，目的是比较髓质骨和含气骨、插入部位以及针的设计。负型螺纹针的固定力比光滑针更大（P < 0.05）。在比较尺骨和股骨的固定力时，光滑针未发现差异，而螺纹针在尺骨中的拔出强度比在股骨中更大（P < 0.05）。当考虑相同类型的针时，沿同一骨骼的针位置未观察到差异。这些结果表明，负型螺纹针的固定力比光滑针更大，并且含气骨比髓质骨为负型螺纹针提供的拔出强度更小。
