原发性骨关节炎在老年人中发病率较高，而膝骨关节炎又更为常见。
The morbidity of primary osteoarthritis is higher in the elderly, especially the osteoarthritis of Knee is the more common.
原发性骨关节炎在老年人中发病率较高，而膝骨关节炎又更为常见。
The morbidity of primary osteoarthritis is higher in the elderly, especially the osteoarthritis of Knee is the more common.
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