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Synovial fluid HIF-1α levels are correlated with gray value of HIF-1α in articular cartilage (Pearson's ρ=−0.815; P<0.001). Pearson's correlation and linear regression analyses were applied to determine the correlation between synovial fluid HIF-1α levels and the gray values of HIF-1α in articular cartilage. HIF-1α, hypoxia-inducible factor 1α.
