title: Absence or interruption of the supra-acetabular line: a subtle plain film indicator of hip pathology.
abstract: OBJECTIVE
  To show that absence or interruption of the supra-acetabular line is a subtle plain film indicator of pathology in the acetabulum.
  
  
  METHODS
  Nineteen hips from 17 patients with known disease processes involving the acetabulum as demonstrated by subsequent magnetic resonance imaging, bone scan or plain film follow-up were evaluated with antero-posterior (AP) plain films of the pelvis. Three additional cases were diagnosed prospectively using interruption of the supra-acetabular line as the criterion for inclusion. Fifty AP plain films of the pelvis in patients without hip pain were examined prospectively to determine normal imaging criteria.
  
  
  CONCLUSIONS
  The normal supra-acetabular line measures 2-3 mm in thickness superiorly and is a thin sclerotic line in the medial aspect. In all 22 hips (with pathology) in this series, the line was interrupted or absent. Loss or interruption of the supra-acetabular line may thus be a subtle pain film indicator of a disease process involving the acetabulum. This plain film sign has not previously been reported.
authors.affiliation: Department of Radiology, University of California San Francisco 94143, USA.
authors.forename: N M
authors.initials: NM
authors.lastname: Major
authors.forename: C A
authors.initials: CA
authors.lastname: Helms
mesh_terms: D000077:Acetabulum / Q000000981:diagnostic imaging* / Q000473:pathology; D005260:Female; D006621:Hip Joint / Q000000981:diagnostic imaging* / Q000473:pathology; D006801:Humans; D007592:Joint Diseases / Q000000981:diagnostic imaging / Q000473:pathology; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D009369:Neoplasms / Q000000981:diagnostic imaging* / Q000473:pathology; D011859:Radiography