Fig 1. Ultrasound semiquantitative synovitis score.

0: no synovial hypertrophy and no Doppler signal; 1: synovial thickening filling the angle between the periarticular bones, without bulging over the line linking tops of the bones and up to three single Doppler spots signals or up to two confluent spots or one confluent spot + up to two single spots; 2: synovial thickening bulging over the line linking tops of periarticular bones and vessels signals in less than half of the synovium; 3: synovial thickening bulging over the line linking tops of periarticular bones and with extension to at least one of the bone diaphyses and vessels signals in more than half of the synovium.