title: Discriminant validity study of Achilles enthesis ultrasound.
abstract: OBJECTIVE
  We want to know if the ultrasound examination of the Achilles tendon in spondyloarthritis is different compared to other rheumatic diseases.
  
  
  METHODS
  We studied 97 patients divided into five groups: rheumatoid arthritis, spondyloarthritis, gout, chondrocalcinosis and osteoarthritis, exploring six elementary lesions in 194 Achilles entheses examined.
  
  
  RESULTS
  In our study the total index ultrasonographic Achilles is higher in spondyloarthritis with significant differences. The worst elementary spondyloarthritis lesions for discriminations against other pathologies were calcification.
  
  
  CONCLUSIONS
  This study aims to demonstrate the discriminant validity of Achilles enthesitis observed by ultrasound in spondyloarthritis compared with other rheumatic diseases that may also have ultrasound abnormalities such enthesis level.
authors.affiliation: Sección de Reumatología, Hospital Comarcal de Laredo, Cantabria, España. Electronic address: rosaex@euskalnet.net.
authors.forename: María Rosa
authors.initials: MR
authors.lastname: Expósito Molinero
authors.affiliation: Servicio de Reumatología, Hospital La Paz, Madrid, España.
authors.forename: Eugenio
authors.initials: E
authors.lastname: de Miguel Mendieta
mesh_terms: D000125:Achilles Tendon / Q000000981:diagnostic imaging*; D000328:Adult; D000368:Aged; D003430:Cross-Sectional Studies; D003937:Diagnosis, Differential; D000070676:Enthesopathy / Q000000981:diagnostic imaging* / Q000209:etiology; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D012216:Rheumatic Diseases / Q000150:complications*; D016037:Single-Blind Method; D025241:Spondylarthritis / Q000150:complications*; D014463:Ultrasonography
keywords: Achilles’ tendon; Artritis gotosa; Artritis reumatoide; Artrosis; Chondrocalcinosis; Condrocalcinosis; Ecografía; Espondiloartritis; Gouty arthritis; Osteoarthritis; Rheumatoid arthritis; Spondyloarthritis; Tendón de Aquiles; Ultrasound