Table 4 Multiple linear regression results evaluating the effects of clinically meaningful weight loss and gain on the outcomes after TKA surgery

WOMAC total score

11.50 ± 2.85

< 0.001*

17.47 ± 1.81

< 0.001*

WOMAC pain score

1.40 ± 0.63

0.001*

2.07 ± 0.80

0.120

WOMAC function score

9.45 ± 2.60

0.002*

13.53 ± 2.17

< 0.001*

WOMAC stiffness score

0.64 ± 0.66

0.015*

1.87 ± 0.92

< 0.001*

SF-36 PCS score

49.38 ± 2.02

< 0.001*

42.4 ± 3.14

0.001*

SF-36 MCS score

50.83 ± 8.19

0.025*

43.80 ± 3.19

0.003*