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Bone-Scanning for Diagnosis of AVN

- Discussion:
    - 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 
    - 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:
          - reflex sympathetic dystrophy
          - transient osteoporosis;
          - infection;
          - tumors

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