Aronsson D D, Stokes I A, Rosovsky J, Spence H
Department of Orthopaedics and Rehabilitation, The University of Vermont, Burlington 05405-0084, USA.
J Spinal Disord. 1999 Apr;12(2):141-6.
The purpose of this study was to determine whether compression and distraction applied to adjacent vertebrae in the calf tail could modulate vertebral growth. Seven 6-week-old calves had two pairs of adjacent tail vertebrae instrumented with an Ilizarov external fixator with calibrated springs designed to apply a 30-50-N axial load to the vertebrae. Data were obtained from 17 vertebrae loaded in compression and 4 vertebrae loaded in distraction. Vertebrae adjacent (cranial and caudal) to the instrumented vertebrae served as controls. The length of each vertebra on the postoperative radiograph was subtracted from the length of the same vertebra on the radiograph taken 6 months after the operation to calculate vertebral growth. The vertebrae loaded in compression had a growth rate of 68 +/- 42% of that of the controls. In contrast, the vertebrae loaded in distraction had a growth rate of 123 +/- 78% of that of the controls.
本研究的目的是确定对小牛尾巴相邻椎骨施加压缩和牵张是否能调节椎体生长。7只6周龄的小牛，其两对相邻尾椎用带有校准弹簧的Ilizarov外固定器进行固定，校准弹簧旨在对椎体施加30 - 50 N的轴向负荷。数据来自17个承受压缩负荷的椎体和4个承受牵张负荷的椎体。与器械固定椎体相邻（头侧和尾侧）的椎体作为对照。用术后X线片上每个椎体的长度减去术后6个月所拍摄X线片上同一椎体的长度，以计算椎体生长情况。承受压缩负荷的椎体生长速率为对照椎体的68±42%。相比之下，承受牵张负荷的椎体生长速率为对照椎体的123±78%。
