Leahy J C, Hukins D W
Department of Bio-Medical Physics and Bio-Engineering, University of Aberdeen, Foresterhill, Aberdeen AB25 2ZD, UK.
J Mater Sci Mater Med. 2001 Aug;12(8):689-92. doi: 10.1023/a:1011212425029.
The viscoelastic properties of the nucleus pulposus were measured in compression for 35 specimens dissected from 9 sheep. Measurements on 19 specimens were made on the day of slaughter; the remaining 16 specimens were stored frozen and thawed before testing. A preload of 0.2 N was applied to each specimen and a cyclic compression of 10 microm applied at eight frequencies in the range 0.1-10 Hz at a temperature of 37 degrees C. Freezing appeared to increase the storage modulus, E ', but not the loss modulus, E ", or tan delta=E "/E '. These parameters, E ', E " and tan delta, had values of 64+/-28 kPa, 24+/-11 and 0.33 kPa+/-0.07, respectively. The value of tan delta passed through a minimum at a loading frequency of 0.9+/-0.2 Hz. The water content of the specimens was 80+/-2%.
从9只绵羊身上解剖获取了35个样本，对其髓核的粘弹性特性进行了压缩测量。在屠宰当天对19个样本进行了测量；其余16个样本在测试前进行冷冻保存并解冻。对每个样本施加0.2 N的预载，并在37摄氏度的温度下，以0.1至10 Hz范围内的八个频率施加10微米的循环压缩。冷冻似乎增加了储能模量E'，但没有增加损耗模量E''或损耗角正切tanδ=E''/E'。这些参数E'、E''和tanδ的值分别为64±28 kPa、24±11和0.33 kPa±0.07。tanδ的值在0.9±0.2 Hz的加载频率下达到最小值。样本的含水量为80±2%。
