Fig. 3

Significant differences between asymptomatic PMN-positive and PMN-negative groups. Asymptomatic PMN positivity was defined as a CRP level of <1 mg/dl and no local swelling, local heat, tenderness, or evidence of pus. a Kaplan–Meier analysis showed that BHA survival was significantly shorter in the asymptomatic PMN-positive than in the PMN-negative group. b CRP levels were significantly different between the asymptomatic PMN-positive and PMN-negative groups (p < 0.05). c JOA hip scores were significantly different between the asymptomatic PMN-positive and PMN-negative groups (p < 0.05)