Watrous Gwyneth K, Moens Noel M M, Runciman John, Gibson Tom W G
Department of Clinical Studies, University of Guelph, Ontario Veterinary College, Guelph, Ontario, Canada.
Department of Engineering, University of Guelph, Guelph, Ontario, Canada.
Vet Comp Orthop Traumatol. 2018 Nov;31(6):438-444. doi: 10.1055/s-0038-1668084. Epub 2018 Oct 24.
The purpose was to compare the biomechanical properties of a 1.5 mm locking compression plate (1.5 LCP) to the 1.5 mm straight plate (1.5 P), 1.5 mm straight plate stacked (1.5 PSt) and 2.0 mm straight plate (2.0 P) in compression and torsion. We hypothesized that biomechanical properties of the 1.5 LCP would be equivalent to properties of the 1.5 P and would represent an alternative for the treatment of radial fractures in miniature breed dogs in which those plates would be used.
A 1 mm fracture gap model was created with a bone surrogate stabilized with a six-hole plate. Sixteen constructs were built for each of the four plate configurations. Eight constructs from each group were tested in compression to failure and eight constructs were tested in torsion to failure.
In compression testing, the 1.5 LCP was stiffer than the 1.5 P, and had similar stiffness than the 1.5 PSt and the 2.0 P. The load at yield of the 1.5 LCP was slightly lower than the 1.5 P. In torsion, the 1.5 LCP and 1.5 P had similar stiffness, but 1.5 LCP was slightly stronger than 1.5 P. The 1.5 PSt and 2.0 P were overall superior to the 1.5 LCP but only marginally so for the 1.5 PSt.
The 1.5 LCP can be considered biomechanically equivalent to the 1.5 P under the present experimental conditions. The use of the 1.5 LCP can be considered as an option for radial fracture repair in dogs in which a 1.5 P would have otherwise been used. The use of a locking plate to improve overall success rate, in these fractures, remains to be confirmed clinically.
比较1.5毫米锁定加压接骨板（1.5 LCP）与1.5毫米直板（1.5 P）、1.5毫米叠层直板（1.5 PSt）和2.0毫米直板（2.0 P）在压缩和扭转时的生物力学性能。我们假设1.5 LCP的生物力学性能将等同于1.5 P的性能，并且对于使用这些接骨板的小型犬桡骨骨折治疗来说，它将是一种替代选择。
使用六孔接骨板固定骨替代物创建1毫米骨折间隙模型。针对四种接骨板配置中的每一种构建16个结构。每组中的8个结构进行压缩测试直至失效，8个结构进行扭转测试直至失效。
在压缩测试中，1.5 LCP比1.5 P更硬，并且与1.5 PSt和2.0 P具有相似的刚度。1.5 LCP的屈服载荷略低于1.5 P。在扭转测试中，1.5 LCP和1.5 P具有相似的刚度，但1.5 LCP比1.5 P稍强。1.5 PSt和2.0 P总体上优于1.5 LCP，但对于1.5 PSt只是略微如此。
在当前实验条件下，1.5 LCP在生物力学上可被认为等同于1.5 P。对于原本会使用1.5 P的犬桡骨骨折修复，1.5 LCP的使用可被视为一种选择。在这些骨折中使用锁定接骨板以提高总体成功率，仍有待临床证实。
