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Ultrasound in the evaluation of enthesitis: status and perspectives.Gandjbakhch, Frédérique; Terslev, Lene; Joshua, Fredrick; Wakefield, Richard J; Naredo, Esperanza; D'Agostino, Maria Antonietta; Rheumatology Department, Université Paris 6-Pierre et Marie Curie, Hôpital La Pitié Salpetrière, APHP, 83 Boulevard de l’hôpital 75013 Paris, France. (Arthritis research & therapy, 2011)An increasing number of studies have applied ultrasound to the evaluation of entheses in spondyloarthritis patients. However, no clear agreement exists on the definition of enthesitis, on the number and choice of entheses to examine and on ultrasound technique, which may all affect the results of the examination. The objectives of this study were to first determine the level of homogeneity in the ultrasound definitions for the principal lesions of enthesitis in the published literature and second, to evaluate the metric properties of ultrasound for detecting enthesitis according to the OMERACT filter.