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. 2016 Nov 19;100(1):99. doi: 10.5334/jbr-btr.1206

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Copyright: © 2016 The Author(s)

This is an open-access article distributed under the terms of the Creative Commons Attribution 4.0 International License (CC-BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. See http://creativecommons.org/licenses/by/4.0/.

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Hydroxyapatite deposition disease (HADD) in the medial collateral ligament in a 66-year-old patient with pain and swelling at the medial aspect of the right knee.

Coronal FS T2-WI (A) shows thickening and high signal intensity at the femoral insertion of the medial collateral ligament (arrow). Also note shortening of the body of the medial meniscus, in keeping with a previous medial meniscectomy. Plain films (B) show calcifications at the medial collateral ligament, allowing precise characterization as HADD with surrounding inflammation as origin of the patient’s pain. Calcifications are far better demonstrated on plain radiographs compared to MRI.