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Table 1 (abstract P9). Two Definitions for Ultrasound Active Joint Count

From: Proceedings of the 2018 Childhood Arthritis and Rheumatology Research Alliance (CARRA) Scientific Meeting

USAJC #1 Number of joints with evidence for any component of MSUS pathology (Synovial thickening, Joint Effusion or Hyperemia) > 1+ in any recess.
USAJC #2 Number of joints with evidence for Synovial Thickening (> 1+) with Hyperemia (> 1+) with or without Joint Effusion.