Skip to main content

Table 2 Comparison of the WOMAC and SF-36 scores for the 2 groups

From: No difference in the functional improvements between unilateral and bilateral total knee replacements

  

Group 1

Group 2

95%CI

p-value#

p-value$

  

(n = 93)

(n = 51)

   

WOMAC

 Pain

Pre-op

61.1 ± 14.7

60.6 ± 13.5

−4.38~ 5.43

0.833

0.464

Post-op

19.7 ± 14.6

18.3 ± 12.7

−3.43~ 6.19

0.572

0.397

Change

−41.4 (from − 44.9 to −37.9)

− 42.2 (from − 47.2 to −37.3)

−5.14~ 6.85

0.779

0.931

 Stiffness

Pre-op

48.6 ± 26.9

52.0 ± 26.8

−12.56~ 5.93

0.876

0.608

Post-op

22.0 ± 21.2

24.5 ± 21.6

−9.87~ 4.86

0.503

0.757

Change

−26.6 (from −31.2 to −22.0)

−27.5 (−34.1 to −20.8)

−7.19~ 8.81

0.841

0.741

 Function

Pre-op

56.5 ± 11.5

56.6 ± 10.9

−4.07~ 3.71

0.926

0.821

Post-op

20.5 ± 14.5

19.7 ± 14.1

−4.19~ 5.70

0.764

0.517

Change

−36.0 (from − 39.0 to − 33.1)

−36.9 (from −41.1 to − 32.8)

− 4.13~ 6.01

0.716

0.631

 Total

Pre-op

56.8 ± 11.3

57.1 ± 10.3

−4.06~ 3.46

0.876

0.795

Post-op

20.4 ± 14.2

19.8 ± 13.8

−4.22~ 5.44

0.803

0.541

Change

−36.3 (from − 39.3 to −33.4)

−37.3 (from −41.4 to − 33.1)

− 4.17~ 5.99

0.724

0.684

SF-36

 Health change

Pre-op

36.3 ± 17.9

34.8 ± 16.6

−4.52~ 7.49

0.626

0.899

Post-op

45.2 ± 18.2

47.1 ± 17.1

−8.02~ 4.22

0.541

0.254

Change

8.9 (5.7–12.0)

12.3 (7.6–16.9)

−8.88~ 2.12

0.226

0.166

 Physical

Pre-op

28.6 ± 11.3

28.2 ± 10.8

−3.45~ 4.22

0.842

0.887

Post-op

74.0 ± 15.4

74.0 ± 15.2

−5.25~ 5.28

0.996

0.680

Change

45.3 (42.2–48.5)

45.7 (41.0–50.4)

−5.94~ 5.19

0.895

0.774

 Mental

Pre-op

46.4 ± 15.0

48.8 ± 15.6

−7.67~ 2.78

0.357

0.254

Post-op

77.0 ± 9.6

75.5 ± 12.1

−2.17~ 5.09

0.429

0.585

Change

30.6 (27.6–33.7)

26.7 (22.2–31.2)

−1.41~ 9.21

0.149

0.124

  1. Group 1, unilateral TKR; Group 2, bilateral TKR; Pre-op, pre-operative; Post-op, 6 months after surgery
  2. #, The p-value
  3. $, adjusted p-value; Models were adjusted by all factors (gender, age, BMI, education, income, current work, other bone disease, low back pain, history of CVD, history of DM and history of HTN)