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Comparison of two systems for tibial external fixation in rabbits

机译：两种胫骨外固定系统的比较

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Biomechanical characteristics of two external fixator systems (Orthofix device and Hoffmann device) for long bones were tested in rabbits. 12 freshly dissected tibiae were obtained from 6 skeletally mature New Zealand White rabbits, and 4-point bending stiffness in 2 planes (90 and 180o to the fixator pins) and torsional stiffness and strength of the bone-fixator complex were evaluated by use of a material testing machine. In 4-point bending, Orthofix device had higher stiffness and strength, compared with Hoffmann device. When the load was applied 180o to the pins, both devices had higher stiffness compared with that at 90o. In torsional testing, Orthofix device had significantly higher stiffness and strength. Significant differences in structural properties between the 2 systems were evident. Loading direction and gap conditions were important factors in determining properties of the systems. It is concluded that the type of external fixation system and fixation technique should be considered when designing experiments, using the rabbit long bone model.
机译：在兔子中测试了两个用于长骨的外部固定器系统（Orthofix设备和Hoffmann设备）的生物力学特性。从6具骨骼成熟的新西兰白兔中获得12颗新鲜解剖的胫骨，并在2个平面（固定器销钉90和180o）的4个点上进行4点弯曲刚度，并使用A评估骨固定器复合物的扭转刚度和强度。材料试验机。与霍夫曼装置相比，在四点弯曲中，Orthofix装置具有更高的刚度和强度。当对销钉施加180o的载荷时，与90o时相比，两个装置都具有更高的刚度。在扭转测试中，Orthofix设备具有明显更高的刚度和强度。两个系统之间在结构特性上的显着差异是显而易见的。加载方向和间隙条件是确定系统性能的重要因素。结论是，在设计实验时，应使用兔长骨模型考虑外固定系统的类型和固定技术。

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