接头连接这些排骨，这都是外地的研究，因为它们常常磨损，造成渐进的退化性疾病，如骨关节炎。
Joints connect with these ribs, which are field of studies, since they often wear and tear, causing gradual degenerative diseases, such as osteoarthritis.
数百万的美国人患有骨关节炎，又称退化性关节疾病。病情严重的需要做人工关节替换手术。
Millions of people in the United States suffer from osteoarthritis, or degenerative joint disease. The most severe cases requiring joint replacement surgery.
骨关节炎(OA)，或退化性关节疾病，最常见的影响病人是中年和老年人。
Osteoarthritis (oa), or degenerative joint disease most commonly affects patients who are middle-aged and older.
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