EULAR-OMERACT combined scoring system for grading synovitis in rheumatoid arthritis
| Grade 0: Normal joint | No GS-detected SH and no PD signal (within the synovium) |
| Grade 1: Minimal synovitis | Grade 1 SH and ≤Grade 1 PD signal |
| Grade 2: Moderate synovitis | Grade 2 SH and ≤Grade 2 PD signal or Grade 1 SH and a Grade 2 PD signal |
| Grade 3: Severe synovitis | Grade 3 SH and ≤Grade 3 PD signal or Grade 1 or 2 SH and a Grade 3 PD signal |
Proposed combined PDUS (GS and PD) scoring system graded from 0 to 3 describing the criteria for the individual grades in relation to the GS SH and Doppler signal. The higher of the two determines the final combined score. EULAR, European League Against Rheumatism; GS, grey-scale; OMERACT, Outcome Measures in Rheumatology; PD, power Doppler; SH, synovial hypertrophy.