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Effect of IVD degeneration (classification system described by Pfirrmann) on power law exponents of (a) shear modulus (α|G*|) and (b) phase angle (αδ) of the AF and NP tissues. The results are presented as mean ± standard deviation. Significant differences (* p < 0.05) were observed for α|G*| between grade 2 and 3 in AF tissues.
