Hoffmann R, McKellop H A, Sarmiento A, Lu B, Ebramzadeh E
Unfallchirurgische Klinik, Medizinischen Hochschule Hannover.
Unfallchirurg. 1991 Aug;94(8):395-400.
A computer-linked magnetic motion tracker was used to monitor the six components of elastic fracture motions in cadaver tibia with simulated mid-shaft oblique fractures or segmental defects. The limbs were mounted in a servo-hydraulic load frame and stabilized with an Ilizarov frame or an AO-Unifix external fixator. A cyclic load of 150 or 300 N was applied along the long axis of the tibia. Under 150 N load, elastic displacements ranged up to 1.7 mm and elastic rotations ranged up to 0.6 degrees. Under 300 N load, elastic displacements went up to 3.6 mm and elastic rotations ranged up to 1.5 degrees. Comparison of the two fixators showed that the Ilizarov permitted up to 1.75 times more axial pistoning and up to 4 times more A-P displacement. The AO-Unifix permitted up to 4 times more varus-valgus and up to 7 times more A-P angulation. The technique developed for measuring the three-dimensional motion of fractures may have wide applications in further biomechanical and fracture healing studies.
使用计算机连接的磁运动追踪器监测尸体胫骨模拟中段斜形骨折或节段性缺损时弹性骨折运动的六个组成部分。将肢体安装在伺服液压加载框架中，并用伊利扎罗夫框架或AO-单平面外固定器进行固定。沿胫骨长轴施加150或300 N的循环载荷。在150 N载荷下，弹性位移范围可达1.7 mm，弹性旋转范围可达0.6度。在300 N载荷下，弹性位移可达3.6 mm，弹性旋转范围可达1.5度。两种固定器的比较表明，伊利扎罗夫固定器允许的轴向活塞运动最多多出1.75倍，前后位移最多多出4倍。AO-单平面外固定器允许的内翻-外翻最多多出4倍，前后成角最多多出7倍。所开发的测量骨折三维运动的技术可能在进一步的生物力学和骨折愈合研究中有广泛应用。
