Fig. 2

Bias analysis of effects of PCO changes on knee joint function of patients after TKR. KS knee society. a, The change of PCO decrease of 2 mm or more. b, The change of PCO decrease by 0 mm to 2 mm. c, The change of PCO increase by 0 mm to 2 mm. d, The change of PCO increase by 2 mm or more