Table 2 Ultrasound synovial features at baseline and associations with knee pain
No knee pain | Early knee pain | Established knee pain | p for trend | |
|---|---|---|---|---|
Effusion | ||||
Mean ± SD (mm) | 3.02 (2.10) | 4.48 (3.64) | 5.89 (3.48) | < 0.0001 |
≥ 4 mm, n (%) | 23 (24.47) | 136 (45.64) | 64 (62.14) | < 0.0001 |
≥ 4 mm, OR (95% CI) | 1 | 2.64 (1.57–4.45) | 5.07 (2.74–9.38) | |
≥ 4 mm, aOR (95% CI) | 1 | 1.90 (1.07–3.39) | 1.92 (0.92–4.00) | |
Synovial hypertrophy | ||||
Mean ± SD (mm) | 0.65 (1.56) | 2.01 (2.66) | 3.57 (3.49) | < 0.0001 |
≥ 4 mm, n (%) | 5 (5.32) | 69 (23.15) | 44 (42.72) | < 0.0001 |
≥ 4 mm, OR (95% CI) | 1 | 5.43 (2.12–13.92) | 13.27 (4.97–35.43) | |
≥ 4 mm, aOR (95% CI) | 1 | 3.17 (1.17–8.53) | 4.97 (1.66–14.86) | |
Power Doppler signals, n (%) | 0 | 10 (3.36) | 2 (1.94) | 0.4252 |