title: Diagnosis of lesions of the acetabular labrum, of the labral-chondral transition zone, and of the cartilage in femoroacetabular impingement: Correlation between direct magnetic resonance arthrography and hip arthroscopy.
abstract: OBJECTIVE
  To determine the sensitivity and accuracy of direct MR arthrography in the diagnosis of intra-articular lesions associated with femoroacetabular impingement.
  
  
  METHODS
  We used direct MR arthrography to study 51 patients with femoroacetabular impingement who underwent arthroscopic hip surgery. Surgery demonstrated 37 labral tears, 44 lesions in the labral-chondral transitional zone, and 40 lesions of the articular cartilage. We correlated the findings at preoperative direct MR arthrography with those of hip arthroscopy and calculated the sensitivity, specificity, positive predictive value, negative predictive value, and validity index for direct MR arthrography.
  
  
  RESULTS
  The sensitivity and specificity of MR arthrography were 94.5% and 100%, respectively, for diagnosing labral tears, 100% and 87.5%, respectively, for diagnosing lesions of the labral-chondral transition zone, and 92.5% and 54.5%, respectively, for diagnosing lesions of the articular cartilage. The negative predictive value of MR arthrography for lesions of the labral-chondral transitional zone was 100%. MR arthrography accurately defined extensive lesions of the cartilage and the secondary osseous changes (the main factor in poor prognosis), although its diagnostic performance was not so good in small chondral lesions.
  
  
  CONCLUSIONS
  In patients with femoroacetabular impingement, direct MR arthrography can adequately detect and characterize lesions of the acetabular labrum and of the labral-chondral transitional zone as well as extensive lesions of the articular cartilage and secondary osseous changes.
authors.affiliation: Servicio de Radiodiagnóstico, Hospital Clínico San Carlos, Madrid, España. Electronic address: anacresporodriguez@gmail.com.
authors.forename: A M
authors.initials: AM
authors.lastname: Crespo Rodríguez
authors.affiliation: Servicio de Cirugía Ortopédica y Traumatología, Hospital Universitario Puerta de Hierro Majadahonda, Madrid, España.
authors.forename: J C
authors.initials: JC
authors.lastname: de Lucas Villarrubia
authors.affiliation: Servicio de Radiodiagnóstico, Hospital Universitario Puerta de Hierro Majadahonda, Madrid, España.
authors.forename: M A
authors.initials: MA
authors.lastname: Pastrana Ledesma
authors.affiliation: Unidad de Bioestadística, Hospital Universitario Puerta de Hierro Majadahonda, Madrid, España.
authors.forename: I
authors.initials: I
authors.lastname: Millán Santos
authors.affiliation: Servicio de Radiología, Clínica Cemtro, Madrid, España.
authors.forename: M
authors.initials: M
authors.lastname: Padrón
mesh_terms: D000077:Acetabulum / Q000000981:diagnostic imaging*; D000328:Adult; D001175:Arthrography / Q000379:methods; D001182:Arthroscopy; D002358:Cartilage, Articular / Q000000981:diagnostic imaging*; D005260:Female; D057925:Femoracetabular Impingement / Q000000981:diagnostic imaging*; D006621:Hip Joint / Q000000981:diagnostic imaging*; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D012189:Retrospective Studies; D055815:Young Adult
keywords: Arthrography; Arthroscopy; Artrografía; Artrografía mediante resonancia magnética; Artroscopia; Cadera; Cartilage; Cartílago; Chondral; Condral; Femoroacetabular impingement; Hip joint; Labral-chondral transitional zone; Labrum; MR arthrography; Magnetic resonance imaging; Pinzamiento femoroacetabular; Resonancia magnética; Unión condrolabral