Mean change in WOMAC score and change in K/L distribution between baseline (T0) and 2-year follow up (T2)a
| Knee pain at baseline | Hip pain at baseline | ||||||
|---|---|---|---|---|---|---|---|
| TKA− | TKA+ | THA− | THA+ | ||||
| Variable | T0–T2 (n= 732) | T0–T2 (n= 18) | P-value mean Δ | T0–T2 (n= 485) | T0–T2 (n= 40) | P-value mean Δ | |
| WOMAC pain | −1.7 (0.6) | 4.4 (3.5) | 0.12b | −1.2 (0.8) | 4.7 (2.7) | 0.04b | |
| WOMAC physical function | −1.3 (0.5) | 4.9 (4.8) | 0.07b | −1.1 (0.7) | 3.0 (2.1) | 0.10b | |
| Distribution of K/L score 0/1/2/3/4 (%) | T0 T2 | 1479 knees 61/39/0/0/0 50/36/13/1/0 | 21 knees 14/86/0/0/0 5/15/55/20/5 | <0.01c | 1002 hips 74/26/0/0/0 68/30/2/0/0 | 48 hips 28/72/0/0/0 23/23/35/14/5 | <0.01c |
↵a Values are mean change between T0 and T2 (standard error), or percentages %. P-values obtained with
↵b Student’s t-test or
↵c generalised estimating equations (GEE) and indicate whether the change in mean values (Δ) or in distribution of K/L score differ significantly. Progression of K/L score adjusted for baseline K/L score. K/L = Kellgren and Lawrence. T0 = baseline. T2 = 2-year follow-up. THA = total hip arthroplasty. TKA = total knee arthroplasty. WOMAC = Western Ontario and McMaster osteoarthritis index.