Adjusted relative risk (RR) of total knee replacement (TKR): severity of Western Ontario and McMaster Universities pain score (WOMAC) pain versus consistency in a knee-based analysis. RR adjusted for age, sex, race, education, body mass index, depressive symptoms measured by CES-D, clinical site, occupation, and baseline cross-sectional radiographic Kellgren-Lawrence grade.
| Consistency of Pain | ||||||
|---|---|---|---|---|---|---|
| No FKP | Inconsistent FKP | Consistent FKP | ||||
| Severity of Pain, WOMAC | Portion with TKR, % | Adj RR (95% CI) | Portion with TKR, % | Adj RR (95% CI) | Portion with TKR, % | Adj RR (95% CI) |
| Mild (0–2) | 9/2410 (0.4) | 1.0 (referent) | 6/507 (1.2) | 2.2 (0.7–6.8) | 6/177 (3.4) | 5.2 (1.8–15.2) |
| Moderate (> 2–6) | 13/449 (2.9) | 4.6 (2.0–10.4) | 15/521 (2.9) | 3.1 (1.3–7.4) | 46/610 (7.5) | 7.4 (3.6–15.0) |
| Severe (> 6–20) | 2/75 (2.7) | 3.2 (0.7–14.4) | 11/218 (5.1) | 4.7 (2.0–10.7) | 94/881 (10.7) | 8.0 (3.9–16.1) |
FKP: frequent knee pain.