Fig. 5

Increased levels of IL1 beta correlated with hindrance of patients’ physical activity at 3 months. Jonckheere-Terpstra test was performed to evaluate if the levels of each cytokine were correlated with the patients’ degree of physical activity at 3 months (*: p = 0.03, #: p = 0.08). X-axis; patients’ 5° of physical activity score at 3 months after surgery, Y-axis; cytokine levels in synovial fluid at 3 to 4 days after surgery