Elevated levels of interleukin-1β, interleukin-6, tumor necrosis factor-α and vascular endothelial growth factor in patients with knee articular cartilage injury

Figure 2 Serum levels of interleukin-1β, interleukin-6 and tumor necrosis factor-α in patients with different degrees of knee articular cartilage injury. ^aP < 0.05, vs mild; ^cP < 0.05, vs moderate group. IL-1β: Interleukin-1β; TNF-α: Tumor necrosis factor-α; VEGF: Vascular endothelial growth factor.