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. Cependant, OMERACT, le SPARCC semblê etre le score le plus compréhensible : il permet uné evaluation de plusieurs coupes et tient compte de la profondeur et de l'intensité des lésions observées. Il a doncétédoncété le premieràêtrepremieràpremieràêtre testé (en termes de sensibilité au changement) et comparécomparéà un score global d'´ evaluation des lésions inflammatoires de sacroiliaques en IRM. Ainsi, le SPARCC a une meilleure sensibilité au

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.. Vue-postérieure-de-l, articulation sacro-iliaque droite (d'après BOUCHET/CUILLERET) [58], p.39

. Lésion-au-seuil-de-significativité, deux coupes consécutives (coupe 1 et coupe 2) chez un même patient. Lésion (+), peú etendue, du 1/3 moyen du versant iliaque gauche, intense en STIR, se rehaussant en T1 Gd. OEdème sous-ligamentaire iliaque inférieur droit, oedème sous-capsulaire, supérieur gauche (*). . . . . . . . . . . 91

.. Au-seuil-de-significativité, deux coupes consécutives (coupe 1 et coupe 2) chez un même patient Lésion linéaire (+), longeant le bord inférieur du versant iliaque droit, modérément intense en T2, se rehaussant peu en T1 Gd, p.91

.. Lésion-au-seuil-de-significativité, deux coupes consécutives (coupe 1 et 2) chez un même patient Lésion sous-capsulaire inférieure droite (+), modérément intense en STIR, se rehaussant modérément en T1 Gd, p.92

T. Gd and .. , Lésion au seuil de significativité : oedème du tubercule sacré gauche (+), en hypersignal STIR et se rehaussant en, p.92

.. Lésion-au-seuil-de-significativité, Présence d'une anomalie transitionnelle droite. Lésion d'oedème osseux linéaire sous-chondral (+), localisée, modérément intense en T2, p.93

. Rehaussement, ´ etendu mais peu intense. . 94 E.12 présence d'unépanchementunépanchement intra-articulaire gauche, en hypersignal T2. En T1 Gd, rehaussement peu important intra-articulaire gauche (+) . . . . . . . . . . . . 94

. Lésion-de-capsulite, OEdème osseuxétendu osseuxétendu, sous-chondral gauche sacré et iliaque (->) Epanchement intra-articulaire gauche (>)Synovite avec fort rehaussement intra-articulaire gauche (*), se rehaussant en T1 Gd, p.94

. Lésion-peu-intense, inférieure droite (+), présente sur une seule coupe, Difficulté de différencier cette lésion d'un vaisseau et aucune autre lésion associée . . . . . . . . 95 TABLE DES FIGURES

T. Lésion-se-rehaussant-modérément-en, T. Gd, and .. Gd, intéressant la portion ligamentaire sacro-iliaque postérieure gauche (dans son 1/3 moyen) Présente sur une seule coupe, donc non retenue OEdème osseux sous-chondral, ´ etendu, iliaque droit (->), en-dessous du seuil de significativité sur le versant iliaque gauche (<) Epanchement intra-articulaire gauche (*)OEdème sous-capsulaire supérieur gauche (carré), intense en T2 et se rehaussant en, p.96