Halling Krista B, Lewis Daniel D, Cross Alan R, Sammy Richard J, Rapoff Andrew J
Department of Small Animal Clinical Sciences, College of Veterinary Medicine, University of Florida, Gainesville, FL, USA.
Vet Surg. 2003 Jul-Aug;32(4):324-35. doi: 10.1053/jvet.2003.50045.
To compare anatomic reduction and the biomechanical properties of a circular external skeletal fixator (CESF) construct to pin and tension band wire (PTBW) fixation for the stabilization of olecranon osteotomies in dogs.
Cadaveric study.
Forelimbs from 12 skeletally mature mixed-breed dogs, weighing 23 to 28 kg.
An olecranon osteotomy was stabilized with either a CESF construct or PTBW fixation. A single distractive load to failure was applied to each specimen through the triceps tendon. Osteotomy reduction and biomechanical properties were compared between fixation groups.
Reduction was not significantly different (gap: P =.171; malalignment: P =.558) between fixation groups. Osteotomies stabilized with the CESF had greater stiffness (P <.0001) and maximum load sustained (P <.0001) compared to PTBW fixation. There was no significant difference for yield load (P =.318) or for load at 1 mm of axial displacement (P =.997) between fixation groups. Failure of fixation occurred by bending of the intramedullary Steinmann pin and the fixation wires in the CESF specimens and by untwisting of the tension band wire knot with pullout and bending of the Kirschner wires in the PTBW specimens.
Specimens stabilized with the CESF construct had similar reduction and yield load, greater stiffness and maximum load sustained, and less elastic deformation than specimens stabilized with PTBW fixation.
The CESF construct may provide a biomechanically favorable alternative to PTBW fixation for stabilization of olecranon osteotomies in dogs, and its application warrants clinical investigation.
比较环形外固定支架（CESF）结构与克氏针张力带钢丝（PTBW）固定在犬尺骨鹰嘴截骨术稳定中的解剖复位情况及生物力学特性。
尸体研究。
12只骨骼成熟的杂种犬的前肢，体重23至28千克。
用CESF结构或PTBW固定来稳定尺骨鹰嘴截骨术。通过肱三头肌腱对每个标本施加单次直至破坏的牵张负荷。比较固定组之间的截骨复位情况和生物力学特性。
固定组之间的复位情况无显著差异（间隙：P = 0.171；对线不良：P = 0.558）。与PTBW固定相比，用CESF稳定的截骨术具有更大的刚度（P < 0.0001）和最大承受负荷（P < 0.0001）。固定组之间的屈服负荷（P = 0.318）或轴向位移1毫米时的负荷（P = 0.997）无显著差异。CESF标本中髓内斯氏针和固定钢丝弯曲以及PTBW标本中张力带钢丝结松开伴克氏针拔出和弯曲导致固定失败。
与用PTBW固定稳定的标本相比，用CESF结构稳定的标本具有相似的复位情况和屈服负荷、更大的刚度和最大承受负荷以及更小的弹性变形。
CESF结构可能为犬尺骨鹰嘴截骨术的稳定提供一种生物力学上更有利的替代PTBW固定的方法，其应用值得临床研究。
