<oai_dc:dc xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:oai_dc="http://www.openarchives.org/OAI/2.0/oai_dc/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.openarchives.org/OAI/2.0/oai_dc/ http://www.openarchives.org/OAI/2.0/oai_dc.xsd">
  <dc:creator>Meyer DC</dc:creator>
  <dc:creator>Beck M</dc:creator>
  <dc:creator>Ellis T</dc:creator>
  <dc:creator>Ganz R</dc:creator>
  <dc:creator>Leunig M</dc:creator>
  <dc:date>2006</dc:date>
  <dc:description xmlns:ns0="xml" ns0:lang="en">UNLABELLED
Early radiographic detection of femoroacetabular impingement might prevent initiation and progression of osteoarthritis. The structural abnormality in femoral-induced femoroacetabular impingement (cam type) is frequently asphericity at the anterosuperior head/neck contour. To determine which of six radiographic projections (anteroposterior, Dunn, Dunn/45 degrees flexion, cross-table/15 degrees internal rotation, cross-table/neutral rotation, and cross-table/15 degrees external rotation) best identifies femoral head/neck asphericity, we studied 21 desiccated femurs; 11 with an aspherical femoral head/neck contour and 10 with a spherical femoral head/neck contour. To radiographically quantify femoral head asphericity, we measured the angle where the femoral head/neck leaves sphericity (angle alpha). The aspherical femoral head/neck contours had a greater maximum angle alpha (70 degrees ) compared with the spherical head/neck contours (50 degrees ). The angle alpha varied depending on the radiographic projection: it was greatest in the Dunn view with 45 degrees hip flexion (71 degrees +/- 10 degrees ) and least in the cross-table view in 15 degrees external rotation (51 degrees +/- 7 degrees ). Diagnosis of a pathologic femoral head/neck contour depends on the radiologic projection. The Dunn view in 45 degrees or 90 degrees flexion or a cross-table projection in internal rotation best show femoral head/neck asphericity, whereas anteroposterior or externally rotated cross-table views are likely to miss asphericity.


LEVEL OF EVIDENCE
Prognostic study, level II-1 (retrospective study).</dc:description>
  <dc:identifier>https://sonar.ch/global/documents/4171</dc:identifier>
  <dc:language>eng</dc:language>
  <dc:relation>info:eu-repo/semantics/altIdentifier/doi/10.1097/01.blo.0000201168.72388.24</dc:relation>
  <dc:relation>info:eu-repo/semantics/altIdentifier/pmid/16456309</dc:relation>
  <dc:source>Clinical orthopaedics and related research. - 2006</dc:source>
  <dc:subject xmlns:ns1="xml" ns1:lang="en">Female</dc:subject>
  <dc:subject xmlns:ns2="xml" ns2:lang="en">Femur Head</dc:subject>
  <dc:subject xmlns:ns3="xml" ns3:lang="en">Femur Neck</dc:subject>
  <dc:subject xmlns:ns4="xml" ns4:lang="en">Humans</dc:subject>
  <dc:subject xmlns:ns5="xml" ns5:lang="en">Male</dc:subject>
  <dc:subject xmlns:ns6="xml" ns6:lang="en">Radiography</dc:subject>
  <dc:title xmlns:ns7="xml" ns7:lang="en">Comparison of six radiographic projections to assess femoral head/neck asphericity.</dc:title>
  <dc:type>http://purl.org/coar/resource_type/c_6501</dc:type>
</oai_dc:dc>