Problem: A 25-year-old female comes into the office complaining of right knee pain following a leap off a wall. The wall was about 4 feet high, and she was wearing tennis shoes. She landed on and twisted her right leg, and the pain was intense after the jump. You take an x-ray of her knee and there is no fracture or other osseous abnormality, but there is palpable tenderness in and around the joint. What do you do next? What would you expect to find?