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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)