The closed fist percussion sign would be useful for diagnosing which pathology?

A patient comes into the emergency room (ER), complaining of pain in his knee. You think the patient might have a fracture, and may need an x-ray, but you are uncertain. Which of the following findings would warrant an x-ray of the patient’s knee?

Which of the following diagnostic criteria is not used to screen for fractures?

The fulcrum test and the patellar-pubic percussion test are tests for fractures of which bone?