What does medial facet of the patella were some chondral changes of the medial parapatellar region mean?

Patellar cartilage: The patella is the kneecap. Cartilage is the smooth lining on the back of the kneecap that allows the kneecap to glide effortlessly. When cartilage is abnormal, this is called a chondral change, usually on an MRI or surgical report. Chondral changes may include thinning of the cartilage, or loose and damaged areas of cartilage.

Early wear: The knee cap (patella) has 3 parts. The medial and lateral facets and the median ridge. Changes in the articular surface indicate wear changes.