Table 4.
Within-group statistical analysis of Western Ontario and MacMaster Universities Osteoarthritis Index (WOMAC) sub-scores
| 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 |
Paired Student’s t test
95%CI confidence interval of mean difference
*Statistically significant at <0.05 level.
aUKR unicompartmental knee replacement group (6 months: n = 25; 1 year: n = 18; 2 years: n = 9)
bBKR bicompartmental knee replacement group (6 months: n = 41; 1 year: n = 29; 2 years: n = 16)
cTKR total knee replacement group (6 months: n = 45; 1 year: n = 26; 2 years: n = 14)