Participants at 3 years (N=481) | Non-participants in follow-up (N=296) | |
---|---|---|
Mean (SD) age (years) | 64.8 (8.1) | 66.5 (9.6) |
Female, n (%) | 246 (51) | 174 (59) |
Mean (SD) BMI (kg/m2) | 29.6 (5.1) | 29.6 (5.3) |
Mean (SD) WOMAC pain score (0–20) | 6.4 (4.4) | 6.3 (4.4) |
Mean (SD) WOMAC function score (0–68) | 20.2 (15.4) | 21.4 (14.9) |
Pattern of knee OA at baseline, n (%) | ||
Normal x-rays | 147 (31) | 99 (33) |
TFJOA alone | 20 (4) | 11 (4) |
PFJOA alone | 114 (24) | 72 (24) |
Both PFJOA and TFJOA | 200 (41) | 114 (39) |
Five years or more since problem onset, n (%) | 273 (57) | 139 (47) |
Present episode of knee pain for ≥12 months, n (%) | 238 (49) | 140 (47) |
BMI, body mass index; OA, osteoarthritis; PFJOA, patellofemoral joint osteoarthritis; TFJOA, tibiofemoral joint osteoarthritis; WOMAC, Western Ontario and McMaster Universities Osteoarthritis Index.