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Dorsal ultrasound images of MCPJ at bare areas. (a) Radial recess shows distinct hypoechoic synovium (arrow head) compared to displaced hyperechoic proper collateral ligament (white arrow) and bone (black arrow). Calipers are being used to measure the maximal synovial thickness at this region with characteristic appearance on ultrasound. (b) shows no synovial thickening between the proper collateral ligament (white arrow) and adjacent to cortical bone (black arrow).
