Fig. 4
Longitudinal view of the dorsal aspect of the wrist joint in a 6-year-old child. The upper images (a, b) show the normal sonoanatomy on Grey-scale US (a) and power-Doppler US (b) showing single vessels close to os capitate. The lower images (c, d, e) show synovitis of the wrist joint in a patient with JIA. Synovial vascularity detected in the joint recesses by Doppler (image d, power Doppler and image e, color Doppler) reflects active inflammation. The distal epiphyseal cartilage of radius (er) is visible as an anechoic structure surrounding the secondary ossification nucleus (*). Dynamic examination let distinguish the epiphyseal cartilage of radius from effusion/synovitis (syn)