ErosionUltrasonography (US) is more sensitive in detecting erosions when compared with conventional radiography (CR). Images below: 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.
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