The meta-analysis was based on five eligible case-control studies involving 419 cases and 969 controls and summarized data indicating the association between PAI-1 polymorphism and risk of osteonecrosis of the femoral head. Odds ratios (OR) with 95 % confidence intervals (95 % CI) were used to assess the strength of this association in the random-effects model or fixed-effects model.
A significant association between PAI-1 4G/5G polymorphism and ONFH susceptibility was observed for 4G4G + 4G5G vs. 5G5G (OR = 1.766, 95 % CI 1.279-2.437, P = 0.001), 4G/4G vs. 4G/5G + 5G/5G (OR = 2.050, 95 % CI 1.581-2.657, P = 0.000), 4G/4G vs. 5G/5G (OR = 2.553, 95 % CI 1.345-4.846, P = 0.004), and 4G vs. 5G (OR = 1.758, 95 % CI 1.236-2.500, P = 0.002). No significant association between PAI-1 4G/5G polymorphism and ONFH susceptibility was observed for 4G/5G vs. 5G/5G (OR = 1.327, 95 % CI 0.939-1.877, P = 0.109).
This meta-analysis suggested that 4G/5G polymorphism of the PAI-1 gene was a risk factor for ONFH. This study also suggests that the PAI-1 4G4G genotype may indicate a risk for ONFH.
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