TY - JOUR
T1 - Osmoviscoelastic finite element model of the intervertebral disc
AU - Schroeder, Yvonne
AU - Wilson, Wouter
AU - Huyghe, Jacques M.
AU - Baaijens, Frank P.T.
PY - 2006/8
Y1 - 2006/8
N2 - Intervertebral discs have a primarily mechanical role in transmitting loads through the spine. The disc is subjected to a combination of elastic, viscous and osmotic forces; previous 3D models of the disc have typically neglected osmotic forces. The fibril-reinforced poroviscoelastic swelling model, which our group has recently developed, is used to compute the interplay of osmotic, viscous and elastic forces in an intervertebral disc under axial compressive load. The unloaded 3D finite element mesh equilibrates in a physiological solution, and exhibits an intradiscal pressure of about 0.2 MPa. Before and after axial loading the numerically simulated hydrostatic pressure compares well with the experimental ranges measured. Loading the disc decreased the height of the disc and results in an outward bulging of the outer annulus. Fiber stresses were highest on the most outward bulging on the posterior-lateral side. The osmotic forces resulted in tensile hoop stresses, which were higher than typical values in a non-osmotic disc. The computed axial stress profiles reproduced the main features of the stress profiles, in particular the characteristic posterior and anterior stress which were observed experimentally.
AB - Intervertebral discs have a primarily mechanical role in transmitting loads through the spine. The disc is subjected to a combination of elastic, viscous and osmotic forces; previous 3D models of the disc have typically neglected osmotic forces. The fibril-reinforced poroviscoelastic swelling model, which our group has recently developed, is used to compute the interplay of osmotic, viscous and elastic forces in an intervertebral disc under axial compressive load. The unloaded 3D finite element mesh equilibrates in a physiological solution, and exhibits an intradiscal pressure of about 0.2 MPa. Before and after axial loading the numerically simulated hydrostatic pressure compares well with the experimental ranges measured. Loading the disc decreased the height of the disc and results in an outward bulging of the outer annulus. Fiber stresses were highest on the most outward bulging on the posterior-lateral side. The osmotic forces resulted in tensile hoop stresses, which were higher than typical values in a non-osmotic disc. The computed axial stress profiles reproduced the main features of the stress profiles, in particular the characteristic posterior and anterior stress which were observed experimentally.
KW - Collagen
KW - Fibril reinforced finite element model
KW - Intervertebral disc
KW - Proteoglycans
KW - Swelling
UR - http://www.scopus.com/inward/record.url?scp=33748562872&partnerID=8YFLogxK
U2 - 10.1007/s00586-006-0110-3
DO - 10.1007/s00586-006-0110-3
M3 - Article
C2 - 16724211
AN - SCOPUS:33748562872
SN - 0940-6719
VL - 15
SP - S361-S371
JO - European Spine Journal
JF - European Spine Journal
IS - SUPPL. 3
ER -