Comparison between knee joints with and without a previous history of clinical arthritic activity.
| Active Knees | Not Active Knees | Estimated Difference* | p* | |
|---|---|---|---|---|
| Right knee | ||||
| US | n = 55 | n = 19 | ||
| Lateral | 2.91 (± 0.7) | 3.4 (± 1.1) | 0.23 (−0.1 to 0.6) | 0.21 |
| Medial | 2.7 (± 0.7) | 3.13 (± 1.1) | 0.15 (−0.2 to 0.5) | 0.36 |
| Radiography | n = 55 | n = 18 | ||
| Lateral | 6.83 (± 1.1) | 7.35 (± 1.2) | 0.29 (−0.4 to 1.0) | 0.41 |
| Medial | 6.38 (± 1.3) | 7.82 (± 2.1) | 0.68 (0.04–1.3) | 0.04 |
| Left knee | ||||
| US | n = 46 | n = 26 | ||
| Lateral | 3.07 (± 0.9) | 3.12 (± 0.9) | 0.04 (−0.3 to 0.3) | 0.79 |
| Medial | 2.75 (± 0.9) | 2.91 (± 0.9) | 0.08 (−0.2 to 0.4) | 0.55 |
| Radiography | n = 47 | n = 27 | ||
| Lateral | 6.57 (± 1.1) | 7.07 (± 1.2) | 0.40 (−0.2 to 1.0) | 0.16 |
| Medial | 6.64 (± 1.6) | 7.34 (± 1.9) | 0.47 (−0.08 to 1.0) | 0.09 |
Measurements in mm, mean (± SD).
↵* Regression analysis controlled for age, sex, and JIA subtype. US: ultrasound; JIA: juvenile idiopathic arthritis.