Terjesen T, Benum P
Acta Orthop Scand. 1983 Apr;54(2):256-62. doi: 10.3109/17453678308996566.
In order to study the in vitro stress-protecting effect on intact bone, and the rigidity of plate fixation on osteotomized bone, human and rabbit tibiae were tested in three-point bending in an Instron testing machine. Intact tibiae were loaded in the elastic range before and after metal plate application. The deformation was measured with a linear voltage differential transformer. In the human specimens a median stiffness increase of 31 per cent was obtained in the plated bone segment after application of a tibial plate (140 x 12 x 4 mm) and of 43.8 per cent after application of a femoral plate (140 x 16 x 5 mm). In the rabbit specimens a median stiffness increase of 31.9 per cent was obtained after application of a thin plate (45 x 5 x 1 mm). In osteotomized human tibiae with tibial plate fixation, a median elastic stiffness of 51.4 per cent of the intact bone was found, compared to 40.4 per cent in osteotomized rabbit tibiae plated with the thin plate. There was good agreement between the results in human tibiae plated with a tibial plate, and rabbit tibiae with the small plate. In previous studies of the stress-protecting effect of internal plate fixation on rabbit tibiae more rigid plates have been used. These plates seem to have been overdimensioned. In further studies in rabbits plates of similar size as the one tested in this study should be applied.
为了研究对完整骨骼的体外应力保护作用以及接骨板固定对截骨后骨骼的刚性，在Instron试验机上对人和兔的胫骨进行三点弯曲试验。在应用金属接骨板前后，对完整胫骨在弹性范围内加载。用线性可变差动变压器测量变形。在人体标本中，应用胫骨接骨板（140×12×4mm）后，接骨板固定的骨段刚度中位数增加31%，应用股骨接骨板（140×16×5mm）后增加43.8%。在兔标本中，应用薄板（45×5×1mm）后刚度中位数增加31.9%。在接骨板固定的截骨人体胫骨中，发现弹性刚度中位数为完整骨骼的51.4%，而在应用薄板固定的截骨兔胫骨中为40.4%。应用胫骨接骨板的人体胫骨和应用小板的兔胫骨的结果之间有良好的一致性。在以前关于接骨板内固定对兔胫骨应力保护作用的研究中，使用了更刚性的接骨板。这些接骨板似乎尺寸过大。在对兔的进一步研究中，应应用与本研究中测试的接骨板尺寸相似的接骨板。
