Fig. 2

Macrophage supernatants’ effect on the viability of fibroblasts treated with 1 mg/ml UHMWPE particles at day 5. Two asterisks indicate p < 0.01, three asterisks indicate p < 0.001 versus A (fibroblasts only); Two number signs indicate p < 0.01, three number signs indicate p < 0.001 versus B (fibroblasts + 1 mg/ml UHMWPE particles). a. fibroblasts only; b. fibroblasts + 1 mg/ml UHMWPE particles; C1-C5. fibroblasts + 1/16, 1/8, 1/4, 1/2, 1/1 of macrophage supernatants stimulated by 1mg/ml of UHMWPE particles, respectively