<unk>  is a degenerative process of bone commonly found in patients with osteoarthritis or non-union of fractures. Friction in the joint causes the reactive conversion of the sub-chondral bone to an ivory-like surface at the site of the cartilage erosion. Osteoarthritis is a degenerative disease of the joints characterized largely by central loss of cartilage and compensatory peripheral bone formation (osteophytes). Over time, as the cartilage wears away, bare, subchondral bone is revealed.<unk>  describes the bony sclerosis which occurs at the areas of cartilage loss.
Eburnation
Heat edema
Inflammaging
Thermal burn
Chemical burn
Electrical burn
Friction burn
Chemosis