Table 2.
Variables independently associated with WOMAC dimension scores at 12 months
| Independent variables | Dependent variables* WOMAC scores at 12 months | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Pain | Stiffness | Function | |||||||
| R2 adjusted 0.369 | R2 adjusted 0.185 | R2 adjusted 0.307 | |||||||
| Coefficients | 95% CI | p Value | Coefficients | 95% CI | p Value | Coefficients | 95% CI | p Value | |
| Number of preexisting comorbidities | 5.4 | 1.2–9.6 | 0.012 | ||||||
| Infrapatellar index less than 75% | 22.4 | 8.2–36.5 | 0.021 | 14.9 | 2.2–27.6 | 0.023 | |||
| IOD (grade 2) | 15.5 | 2.5–28.4 | 0.021 | ||||||
| Number of complications after discharge | 28.5 | 13.1–43.9 | 0.001 | 25.79 | 9.94–41.64 | 0.002 | 23.0 | 9.1–36.8 | 0.002 |
SD = Standard deviation; CI = confidence interval; IOD = degree of intraoperative difficulty; *the coefficients of regression models indicate if an increase in the independent variables is related with worse (positive coefficient) or better (negative coefficient) WOMAC dimension score. R2 adjusted is the proportion of variance in the dependent variable explained by the relevant independent variables shown. N = number; WOMAC = Western Ontario and McMaster Universities Osteoarthritis Index. The three WOMAC scales were normalized to a 0–100 scale for each separate WOMAC dimension, where 0 represents the best health status and 100 the worse health status.