3. Vs, avaient plus d'exacerbation nocturne (90 vs 65%, p=0,05) et un dérouillage matinal plus long (62 vs 38 minutes, p=0,04) par rapport au groupe sans sacro-iliite à l'IRM. Les patients avec une IRM positive avaient plus d'antécédent personnel de psoriasis (47 vs 15%, pp.0-01

. La-durée-moyenne-de, La centralisation des douleurs lors de l'évaluation de McKenzie était à la limite du seuil de significativité (47 vs 76%, p=0,07) La distance doigt-sol et l'indice de Schöber étaient comparables dans les deux groupes. Les tests de provocation de compression, de poussée sur la cuisse, le FABER-test et le test de distraction étaient positifs de manière significative dans le groupe « IRM positive

. La-présence-d, échographie (sacro-iliite US) n'était pas observée de manière significative dans le groupe « IRM positive » (p=0,06 à droite et p=0,30 à gauche) Aucun des patients du groupe « IRM positive » ayant un IMC supérieur à 25 kg/m2 n'avait une inflammation visible en échographie. Lorsque celle-ci était présente , les index de résistance n'étaient pas différents dans les deux groupes de patients (0,62 vs 0,68 p=0.33 à droite, à gauche). L'échographie avait une faible sensibilité (Se 42%, Sp 84%) pour détecter une sacro-iliite active à l'IRM

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