β£What is SONK?β£Which site does it usually occur?β£History of SONK?β£What does MRI show?β£Classification of SONK?β£How can you differentiate this from steroid induced osteonecrosis of femur?β£What meniscal injuries is it associated with?β£What are the risk factors for SONK?β£Natural history of SONK?β£Management of SONK?