Table 2 Comparison of the SF-36 questionnaire total and sub-scales’ score in cases before and 12 month after TKA.

From: Predictors of health-related quality of life after total knee arthroplasty: a case–control study

SF-36 sub-scale

501 patients underwent TKA

P value

Before TKA

12 month after TKA

Physical performance

32.2 ± 19.3

65.2 ± 25.3

< 0.001

Physical role

43.2 ± 14.2

75.7 ± 21.2

< 0.001

Mental health

50.23 ± 12.33

69.38 ± 22.2

< 0.001

Happiness and vitality

24.25 ± 17.16

50.5 ± 20.16

< 0.001

Emotional role

35.33 ± 15.6

62.2 ± 25.2

< 0.001

Social role

31.2 ± 19.2

55.5 ± 21.6

< 0.001

Physical pain

24.41 ± 12.3

55.68 ± 32.5

< 0.001

General health

50.11 ± 18.3

79.25 ± 21.2

< 0.001

Total score

37.55 ± 15.13

64.21 ± 22.2

< 0.001

MCS

38.25 ± 9.54

50.89 ± 9.2

< 0.001

PCS

25.33 ± 7.33

42.58 ± 9.2

< 0.001

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