Hi, Mama Foley! The type of arthritis that involves bone deterioration is usually called osteoarthritis, and sometimes it has different names depending on where it is located. The main thing I wanted to mention to you is that under federal law and accreditation standards, patients have the right to review their medical records including any tests etc. and have anything they don't understand explained to them. Most Dr. offices have the patients rights posted, since this is a requirement. Patients also have the right to obtain copies, although they may have to pay a copying charge. Things involving the spine can be pretty complicated. My suggestion would be to have your Dr. or other provider go over your MRI and any other records with you, and explain the findings until you are satisfied that you know what's going on. These days it's necessary to be very assertive with the healthcare providers as well as doing whatever research we can on our own. Good luck to you as you exercise your rights!