knee pain on and off 2-3 months. limping got worse due to the pain. went and had cortisone injection 5 days ago. unable to walk at all on it 3 days later. received another cortisone injection 2 days ago, still can t walk. On oxycodone for pain. pain med helps with the constant pain, but still can t walk. had xrays---dr says mild arthritis. on complete rest with no weight bearing x 2 days now. only 47 years old. a nurse. no known knee injuries in my past or recent several months. i m thinking a scan needs to be done, that something so much more is going on. could you share your thoughts