Ultrasonography (US) is more sensitive in detecting erosions when compared with conventional radiography (CR).
Pain and swelling in second MCP right and left.
CR and US scans obtained on the same day.
No erosions where reported on CR.
US shows a small erosion over the radial aspect of the MC head right and a large erosion left. Erosions are defined as breaks in the cortical contour seen in two perpendicular planes.