Fig. 5

a Forest plot of odds ratio with 95% confidence intervals in cartilage injury. The gray squares represent the results of each study. Ends of the horizontal bars represent 95% confidence intervals. Dark gray diamonds show the overall results of all studies. Random-effects models were used. b Plot of the meta-regression analysis indicated that prospective and retrospective design were not significant moderators of overall heterogeneity (p = 0.336)