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Spontaneous Osteonecrosis of Knee: A Case Report

Clinical History: A 56 years old male presented with over 2 weeks history of:

  1. Sudden pain in the left knee joint
  2. Antecedent trauma while playing badminton.
  3. No swelling seen.

Imaging Findings:

  • Small arcuate low signal intensity abnormality is noted in subchondral region of articular surface of medial femoral condyle suggestive of insufficiency fracture.
  • Intense bone marrow edema is seen surrounding this region

Final Diagnosis: Spontaneous Osteonecrosis of Knee