Osteoarthritis is a long medical name for a very common joint problem. Inside a joint, the smooth ends of the bones can wear down with time and use.

Osteoarthritis is a long medical name for a very common joint problem是一個很常見關節問題的冗長醫學名稱 Inside a joint, the smooth ends of the bones can wear down with time and use在關節裡面，骨頭光滑的兩端會隨著時間和使用而磨損

The joint then gets stiff and sore — knees, hips, hands, and the spine are the usual places. Mornings can be the worst; cold weather does not help; stairs and jars with tight lids become slow work.

The joint then gets stiff and sore — knees, hips, hands, and the spine are the usual places關節就會變得僵硬又痠痛——膝蓋、髖部、手、和脊椎是常見的部位 Mornings can be the worst; cold weather does not help; stairs and jars with tight lids become slow work早上可能是最難受的；冷天氣也沒有幫助；爬樓梯和打開蓋得很緊的罐子都變得很吃力

It is not an infection you catch from someone else. It is wear, and the body’s repair not quite keeping up. Older people get it more, though actually a joint that was badly hurt years ago can get it younger too.

It is not an infection you catch from someone else這不是從別人身上傳染來的感染 It is wear, and the body's repair not quite keeping up這是磨損，加上身體的修復跟不上 Older people get it more, though actually a joint that was badly hurt years ago can get it younger too年紀大的人比較容易得，不過實際上，多年前受過重傷的關節，也可能讓人比較年輕就得到

Doctors in Taiwan often say 退化性關節炎, “wearing-out arthritis”, which is the same condition under a plainer name. It is not the same as rheumatoid arthritis, where the immune system attacks the joint, and it is not the same as osteoporosis, where the bone itself becomes thin and breaks. This one is about the joint surface, not about bones turning hollow.

Doctors in Taiwan often say 退化性關節炎, "wearing-out arthritis", which is the same condition under a plainer name台灣的醫生常常說「退化性關節炎」，也就是用比較白話的名稱指同一種病 It is not the same as rheumatoid arthritis, where the immune system attacks the joint這跟rheumatoid arthritis（類風濕性關節炎）不一樣，那是免疫系統攻擊關節 and it is not the same as osteoporosis, where the bone itself becomes thin and breaks也跟osteoporosis（骨質疏鬆症）不一樣，那是骨頭本身變薄、容易斷裂 This one is about the joint surface, not about bones turning hollow這個病說的是關節表面的問題，不是骨頭變空心