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Rev Esp Reumatol 1998;25:302
Resonancia magnética de la articulación sacroilíaca normal y en los pacientes con sacroileítis
Magnetic resonance of the normal sacroiliac joint and of patients with sacroiliitis
D. Ybáñez García, MA. Sarti Martínez, J. Martí-Bonmatí
Objective: To describe the appearance of the normal sacroiliac joint in magnetic resonance (MR) imaging, and the abnormalities in patients with known or clinically suspected ankylosing spondylitis (AS). The results were compared with findings obtained by conventional radiography, and diagnostic sensitivities were determined in both techniques.

Material and methods: Twelve volunteers and 31 patients were studied. Anteroposterior pelvic conventional radiographs, in addition to coronal T1 weighted spin-echo and T2* weighted gradient images, and transverse in proton density and T2 weighted spin-echo are the techniques which were performed. All plain films were graded from 0 to 4 according to the modified New York criteria (NY).

Results: MR imaging detected a greater number of abnormalities. These included abnormal cartilage signal intensity (87% of joints), loss of articular margin definition (81% of joints), erosions (71% of joints), subchondral sclerosis (69% of joints), bony bridges (21% of joints) and ankylosis (22.6% of joints); in the bone marrow two changes were detected: fatty infiltration (68% of joints) and inflammatory oedema (2% of joints). MR imaging was significantly more sensitive than conventional radiography in detecting erosions (p < 0.001) and loss of articular margin definition (p < 0.001).

Conclusion: Our study showed that anatomical elements from the sacroiliac joint were well depicted by MR imaging. It is a valuable method to establish the grade of sacroiliitis in AS it may be useful in patients with early stages of the disease.
Palabras clave
Articulación sacroilíaca, Sacroileítis, Espondilitis anquilosante, Resonancia magnética, Anatomía
Morphology of sacroiliac joint, Ankylosing spondylitis, Sacroiliitis, Magnetic resonance imaging