Table 1 Papers obtained from a systematic literature review of ultrasonography in osteoarthritis of the hand

First author	Year	Number of subjects	Joint(s) evaluated	US features assessed	Feature defined in text	Quantification of the feature	Inter-reader reliability	Intra-reader reliability	Construct validity	Content validity	Criterion validity
Iagnocco20	2005	110	PIP and DIP	Erosions	Yes	Yes (number of erosions)	Yes	–	Yes	–	–
Iagnocco23	2000	57	CMC	Effusion	Yes	Yes (depth of articular triangle in mm)	–	–	Yes	–	–

CMC, first carpometocarpal joint; PIP, proximal interphalangeal joint; DIP, distal interphalangeal joint; US, ultrasound.