Season 4 Case 22
Case 22
History: 25 yo with knee pain

Answer:
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So did the age give it away?
Answer: Hemophilia. Notice the overgrown epiphysis, the widened intracondylar notch, the flattened condylar surfaces - also showing superimposed osteoarthritis.
reference: http://radiopaedia.org/articles/haemophilic-arthropathy