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. Author manuscript; available in PMC: 2009 Oct 5.
Published in final edited form as: J Biomech. 2006 Jan 19;40(1):55–63. doi: 10.1016/j.jbiomech.2005.11.013

Table 2.

Viscoelastic model parameters for the 0.2 and 1MPa creep and recovery tests for motion segments (MS), explants with impermeable platen (exp-imp) and explants with permeable platen (exp-perm) boundary conditions

Parameter Creep analysis
 Recovery analysis
MS Exp-imp Exp-perm MS Exp-imp Exp-perm
0.2MPa
d0 (mm) 0.062±0.024 0.024±0.016 0.008±0.006 0.014±0.012 0.009±0.004 -0.001±0.002
d∞ (mm) 0.49±0.12 0.24±0.03 0.15±0.06 0.29±0.22 0.16±0.03 0.11±0.03
d∞-d0 (mm) 0.43±0.11 0.21±0.03 0.14±0.05 0.28±0.21 0.15±0.03 0.11±0.03
τ (s) 2102±671 757±285 325±173 7508±5967 1343±394 1032±535
β 0.64±0.11 0.59±0.10 0.64±0.07 0.73±0.08 0.72±0.12 0.68±0.03
r2 0.994±0.006 0.994±0.004 0.996±0.002 0.997±0.003 0.995±0.003 0.999±0.001
1.0MPa
d0 (mm) 0.024±0.020 0.006±0.013 -0.003±0.008 -0.025±0.015 -0.034±0.008 -0.02±0.004
d∞ (mm) 0.57±0.16 0.36±0.05 0.22±0.06 0.64±0.39 0.26±0.04 0.17±0.04
d∞-d0 (mm) 0.55±0.14 0.35±0.04 0.22±0.06 0.66±0.39 0.29±0.04 0.19±0.04
τ (s) 498±245 212±129 87±42 13750±13259 604±117 599±212
β 0.43±0.11 0.43±0.03 0.59±0.06 0.49±0.07 0.67±0.04 0.73±0.09
r2 0.991±0.004 0.990±0.002 0.989±0.004 0.993±0.003 0.990±0.003 0.993±0.004