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Table 4 Within-group statistical analysis of Western Ontario and MacMaster Universities Osteoarthritis Index (WOMAC) sub-scores

From: Unicompartmental vs. segmental bicompartmental vs. total knee replacement: comparison of clinical outcomes

  Pre-op vs. 6 months 6 months vs. 1 year 1 year vs. 2 years
p value 95%CI p value 95%CI p value 95%CI
UKRa
 Function 0.178 − 96.9 to 169.9 0.520 − 194.2 to 225.2 0.410 − 2.8 to 5.8
 Pain 0.049* 0.4 to 62.9 0.374 − 112.1 to 142.1 0.041* 0.3 to 9.7
 Stiffness 0.184 − 29.0 to 79.3 0.500 − 292.7 to 342.7 0.750 − 13.3 to − 17.3
BKRb
 Function < 0.001* 16.4 to 37.1 0.249 − 6.8 to 22.3 0.172 − 8.0 to 28.5
 Pain 0.001* 17.5 to 45.0 0.080 − 0.6 to 8.1 0.903 − 28.8 to 31.3
 Stiffness 0.009* 7.3 to 36.5 0.665 − 6.9 to 10.1 0.476 − 19.0 to 32.0
TKRc
 Function < 0.001* 26.2 to 47.0 0.392 − 9.2 to 21.6 0.700 − 8.0 to 11.0
 Pain < 0.001* 27.9 to 49.3 0.407 − 10.0 to 22.8 0.580 − 8.4 to 13.4
 Stiffness < 0.001* 16.4 to 43.3 0.385 − 11.4 to 27.0 0.306 − 7.7 to 20.1
  1. Paired Student’s t test
  2. 95%CI confidence interval of mean difference
  3. *Statistically significant at  <0.05 level.
  4. aUKR unicompartmental knee replacement group (6 months: n = 25; 1 year: n = 18; 2 years: n = 9)
  5. bBKR bicompartmental knee replacement group (6 months: n = 41; 1 year: n = 29; 2 years: n = 16)
  6. cTKR total knee replacement group (6 months: n = 45; 1 year: n = 26; 2 years: n = 14)