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. 2018 May 1;48(8):1086–1095. doi: 10.1007/s00247-018-4136-6

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© The Author(s) 2018

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. 3 — Demonstration of joint space measurements on an anteroposterior pelvic radiograph in a 9-year-old boy with juvenile idiopathic arthritis. We performed measurements in two locations: (1) superiorly, we drew a horizontal line along the roof of the acetabulum (solid line) and the most superior aspect of the femoral head (dashed line) and we calculated the distance between the two (arrow labelled 1); and (2) medially, we measured the joint space to the center of the femoral head (arrow labelled 2), just below the fovea (*)