PATELLA - Osteoarthritis

This has been mounted to display the articular surface of the patella; there is some fibrillation of the cartilage apparent, and there is osteoarthritic lipping to be seen.
This man had a left tibial osteotomy for osteoarthritis one year before patella was removed. He had had pain in the knee following this, and was unable to bear weight at all on the left knee.