Bruyn GAW, et al. - Investigators studied the intraobserver and interobserver reliability of the ultrasonographic (US) assessment of subtalar joint (STJ) synovitis in rheumatoid arthritis (RA) cases. Using B-mode and power Doppler (PD) techniques as per an agreed US protocol and using a 4-grade semiquantitative grading score for synovitis [synovial hypertrophy (SH) and signal] and a dichotomous score for the presence of joint effusion (JE), they measured the anteromedial, posteromedial, and posterolateral STJ. They calculated intraobserver and interobserver reliability by Cohen’s and Light’s κ. They also measured weighted κ coefficients with absolute weighting for B-mode and PD signal. They suggested US a safe tool for estimating synovitis of STJ in RA.