MRI was negative, or was it positive?

Went to the Orthopedic Surgeon this morning with my MRI films in hand and got the results. The results were negative, so that means they were positive for me. Well the films showed no tearing of the ACL or and no cartilage tearing. I have some wear from the arthritis but other that that I am fine. I have a sprain that will require ice, a brace and time to heal. So that is good news. So you tell me, why when you have test run at the doctor do the call the results negative when they are really positive for the patient?