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. 2015 Apr 18;41(4):349–362. doi: 10.1007/s00068-015-0530-z

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© The Author(s) 2015

Open AccessThis 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. 2 — FFP type IIa. 84-year-old female with immobilizing lower back pain. Conventional radiograph did not show a bony lesion (a). Also with adequate pain medication mobilization was not possible. The MRI (T1 and STIR sequence in the coronal plane of the sacrum) showed bilateral bone bruise in the sacral ala with a transverse connection on level S2/S3 (b). A CT scan confirmed bilateral sacral involvement without fracture of the anterior pelvic ring (c). The patient was stabilized percutaneously with a trans-sacral bar and bilateral SI-screws (d)