Clinical History: A 56 years old male presented with over 2 weeks history of:
- Sudden pain in the left knee joint
- Antecedent trauma while playing badminton.
- No swelling seen.
- 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