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. 2019 Apr 26;29(11):6345–6354. doi: 10.1007/s00330-019-06187-8

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© The Author(s) 2019

Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

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Fig. 1 — Examples of US grading. a–d MCP joint with effusion, SH grade 3 and PD grade 2, longitudinal and transversal views. e PIP joint with SH grade 3 and PD grade 1. f PIP joint with SH grade 2 and PD grade 3. g, h PIP joint with erosion, longitudinal and transversal views; white arrow, erosion; orange arrow, SH; blue arrow, joint effusion; SH, synovial hypertrophy; PD, power Doppler signal