Intrareader reliability* of MRI features in the distal interphalangeal (DIP) and proximal interphalangeal (PIP) joints (score range in brackets)
| Single measure ICC | PEA | PCA | SDD | |
|---|---|---|---|---|
| Synovitis (0–24) | 0.48 (0.09, 0.70) | 58 (45, 69) | 100 (99, 100) | 6.7 (5.0, 9.1) |
| Flexor tenosynovitis (0–24) | 0.51 (0.49, 0.65) | 58 (49, 67) | 95 (87, 100) | 4.9 (4.1, 5.3) |
| Erosions (0–48) | 0.92 (0.91, 0.96) | 81 (76, 81) | 99 (96, 99) | 5.8 (4.9, 7.9) |
| Cysts (0–16) | 0.21 (0.00, 0.57) | 98 (96, 99) | NA | 1.3 (0.6, 2.5) |
| Osteophytes (0–48) | 0.88 (0.86, 0.89) | 65 (63, 69) | 99 (99, 99) | 6.1 (5.0, 9.5) |
| Joint space narrowing (0–24) | 0.97 (0.93, 0.99) | 81 (73, 88) | 100 (99, 100) | 2.3 (1.7, 2.5) |
| Malalignment frontal (0–8) | 0.79 (0.77, 1.00) | 96 (95, 98) | NA | 1.0 (–, 1.2) |
| Malalignment sagittal (0–8) | – | 100 (99, 100) | NA | 0.6 (–, –) |
| BMLs (0–48) | 0.89 (0.65, 0.89) | 89 (85, 89) | 99 (98, 100) | 3.7 (3.4, 3.7) |
| CL absence (0–16) | 0.81 (0.61, 0.81) | 86 (83, 86) | NA | 4.9 (3.7, 5.4) |
| BMLs at CL insertion sites (0–32) | 0.81 (−0.07, 0.83) | 95 (94, 98) | NA | 2.5 (2.0, 3.8) |
↵* The values are median (minimum, maximum) for the three readers.
BMLs, bone marrow lesions; CL, collateral ligament; ICC, intraclass coefficient; NA, not applicable (dichotomous variable); PCA, percentage close agreement; PEA, percentage exact agreement; SDD, smallest detectable difference; –, scale or part of the scale has zero variance.