Mathiessen A, Hammer HB, Terslev L, et al. - This study was conducted to explore the reliability of ultrasonographic assessment of inflammatory and structural lesions in patients with hand osteoarthritis (OA). Researchers conducted a reliability exercise of static images for the inflammatory features, followed by a patient-based exercise with six sonographers testing inflammatory and structural features in twelve hand OA patients. They applied Cohen’s kappa (κ) for intra-reader and Light’s κ for inter-reader reliability for all features except power Doppler, in which Prevalence-Adjusted Bias-Adjusted Kappa was used. They also conducted a percentage agreement. As per the findings, with ultrasound, substantial to excellent intra-reader reliability was observed for inflammatory features of hand OA. The outcomes demonstrate that inter-reader reliability was moderate, but overall high close agreement between readers imply that better reliability is achievable after further training. Moreover, evaluation of osteophytes in the scapho-trapezio-trapezoid joint and cartilage in the PIP joints achieved less good reliability and the latter is not endorsed.