Jc. Leahy et Dwl. Hukins, Viscoelastic properties of the nucleus pulposus of the intervertebral diskin compression, J MAT S-M M, 12(8), 2001, pp. 689-692
Citations number
20
Categorie Soggetti
Multidisciplinary
Journal title
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN MEDICINE
The viscoelastic properties of the nucleus pulposus were measured in compre
ssion 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 sp
ecimen and a cyclic compression of 10 mum applied at eight frequencies in t
he range 0.1-10 Hz at a temperature of 37 degreesC. Freezing appeared to in
crease 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 pass
ed through a minimum at a loading frequency of 0.9 +/-0.2 Hz. The water con
tent of the specimens was 80 +/-2%. (C) 2001 Kluwer Academic Publishers.