骨性关节炎的英文：
osteoarthritis

"eburnation:Degeneration of bone into a hard, ivorylike mass, as that which occurs at the articular surfaces of bones in osteoarthritis."

More than 2% of the population aged over 55 suffers extreme pain as a result of osteoarthritis of the knee.
55岁以上的人群中有超过2%的人忍受着膝盖关节炎带来的极度痛苦。