Underlying disease | Standard of reference | MRI (consensus opinion) | USS +/− radiography (32 of 50 had radiography) |
---|---|---|---|
Pelvic musculoskeletal infection | 5 | 5 | 0 |
Transient synovitis | 37 | 26 | 28 |
Perthe's disease | 1 | 1 | 1 |
Perthe's + transient synovitis | 1 | 1 | 1 |
True negative (no active disease) | 6 | 5 | 4 |
False negative (for underlying disease) | — | 9 | 12 |
False positive | — | 0 | 4 |