How is osteonecrosis (death of subchondral bone due to an unknown cause) differentiated from pes anserine bursitis?

Updated: May 08, 2018
  • Author: P Mark Glencross, MD, MPH, FACOEM, FAAPMR; Chief Editor: Milton J Klein, DO, MBA  more...
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Answer

Osteonecrosis (death of subchondral bone due to an unknown cause) of the femur may present with sudden, severe medial compartment knee pain that is constant (day and night). Bone scanning shows increased uptake in the femoral condyle.


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