showed a trendP = .053
Pain threshold, structural degeneration and intradiscal pro‐inflammatory cytokines correlate with each other Pearson's correlation analysis showed that the normalized paw withdrawal threshold, IVD degeneration grade, normalized IVD height, as well as intradiscal TNFα and IL‐1β immunopositivity were significantly correlated with each other ( P < .05), except for the association between IVD degeneration and intradiscal IL‐1β expression, which showed a trend of correlation with R 2 of 0.351 ( P = .053) (Table 3 ). 4.