PRTN3 and arthritic joint disease: In a large cohort ofpatients with early arthritis (n = 831), US data facilitated in theidentification of those whose arthritis persisted (including in the ACPA-negative group).Sonographers’ impressions of the scanning data (classified as definitely inflammatory,possibly inflammatory, non-inflammatory) of the symptomatic wrist, MCP and PIP jointsimproved the area under the curve from 0.81 to 0.90.