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Bone-Scanning for Diagnosis of AVN


  • for detection of AVN, technetium-99 methylene-diphosphonate bone-scanning is a useful technique;
    • bone-scanning may be less sensitive in the detection of AVN at early stage of the disease or when both hips are involved symmetrically;
  • reactive of bone at the edge of the infarcted segment will show an increased uptake of the isotope on the delayed image;
  • a photopenic area (cold area) located anterolaterally which is surrounded by an area of increased activity is most consistent w/ dx of avascular necrosis;
  • diff dx