Table 3 Knee pain characteristics at each selection point.
Responded to Regional Pains Survey | Attended research clinic | Responded to 18 m FUP Survey | |
|---|---|---|---|
N* | 1949 | 819 | 776 |
Baseline knee pain chronicity: | |||
Less than 7 days | 180 (11) | 61 (8) | 58 (8) |
1–4 weeks | 249 (15) | 106 (14) | 103 (14) |
1 mo to < 3 mo | 252 (15) | 117 (16) | 111 (16) |
3 mo+ | 1019 (60) | 469 (62) | 441 (62) |
Baseline WOMAC: Mean (sd†) | |||
Pain (0–20) | 6.3 (4.5) | 6.4 (4.4) | 6.4 (4.4) |
Stiffness (0–8) | 2.7 (2.0) | 2.7 (1.9) | 2.7 (1.9) |
Function (0–68) | 21.1 (15.8) | 20.9 (15.2) | 20.7 (15.2) |
Baseline radiographic knee OA¶: | |||
Definite (any compartment) | |||
Yes | 539 (68) | 514 (69) | |
No | 251 (32) | 235 (31) | |
Definite (patello-femoral) ¶: | |||
Yes | 507 (64) | 481 (64) | |
No | 283 (36) | 268 (36) | |
Definite (tibia-femoral) ¶: | |||
Yes | 350 (44) | 332 (44) | |
No | 440 (56) | 417 (56) | |
Severe (any compartment) ¶: | |||
Yes | 313 (40) | 293 (39) | |
No | 477 (60) | 456 (61) | |
Baseline symptomatic knee OA‡ | |||
Yes | 260 (33) | 242 (32) | |
No | 530 (67) | 507 (68) |