Figure 3.

Mechanical properties of nucleus pulposus constructs (n = 5) treated with IL-1β or IL-1ra conditioned media or both were evaluated in confined compression. (a) Aggregate modulus (H_A). (b) Hydraulic permeability (k₀). Values are mean ± standard deviation. *P < 0.05 versus untreated constructs; ◆P < 0.05 versus IL-1β-only treated constructs. IL-1β, interleukin-1 beta; IL-1ra, interleukin-1 receptor antagonist; N.s., Newton second.