The Hip: Preservation, Replacement and Revision

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



Original Text by Clifford R. Wheeless, III, MD.

Last updated by Data Trace Staff on Thursday, September 8, 2011 2:21 pm