• Clinical imaging · Jul 2013

    Comparative Study

    Apparent diffusion coefficients of sacroiliitis in patients with established ankylosing spondylitis.

    • Hatice Tuba Sanal, Sedat Yilmaz, Ismail Simsek, Muhammet Cinar, Hakan Erdem, Salih Pay, Ayhan Dinc, and Cem Tayfun.
    • Department of Radiology, Gulhane Military Medical Academy, Medical Faculty, Gn.Tevfik Saglam Cad., Etlik-Kecioren, Ankara, Turkey. tubasanal@gmail.com
    • Clin Imaging. 2013 Jul 1;37(4):734-9.

    AimTo compare apparent diffusion coefficients (ADCs) of sacroiliac joints (SIJs) in ankylosing spondylitis (AS) patients during advanced-active and advanced-nonactive stages.Materials MethodsAS patients with chronic-active (n=19), chronic-nonactive (n=6), and controls with normal SIJs (n=8) were included. Mean ADCs through 43 subchondral bone marrow edema lesions (SBMELs) were calculated.ResultsMean ADCs were 1.60+/-0.32 × 10-3 mm(2)/s over SBMELs, 0.57+/-0.23 × 10-3 mm(2)/s at periphery of SBMELs, 0.57+/-0.24 × 10-3 mm(2)/s in chronic-nonactive group, and 0.61+/-0.19 × 10-3 mm(2)/s for controls.ConclusionADCs lower than 0.69 × 10-3 mm(2)/s, obtained at subchondral aspect of SIJs of established AS patients with chronic changes, which this number represents the receiver operating characteristic (ROC) best cutoff value, can be considered as normal without possible residual inflammation of concern.Copyright © 2013 Elsevier Inc. All rights reserved.

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