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Bone formation in chondrodermatitis nodularis helicis.

Four out of 37 patients with chondrodermatitis nodularis helicis presented unusually severe cartilaginous changes in the form of calcification and ossification of the distal part of the chondral lamina. These changes were clinically unsuspected. A suggestion is made that chronic inflammatory processes in cartilage increase damage, especially in the elderly, and promote calcium deposition and bone formation.