Why is osteoarthritis common in knee joints?

Related questions

1. Why does osteoarthritis flare up?
2. Are stairs bad for knees?
3. Is Climbing stairs good for arthritic knees?
4. Does osteoarthritis show up on xray?
5. Can arthritis be seen on xray?
6. Are eggs good for arthritis?
7. Does osteoarthritis show up in blood tests?
8. Why is osteoarthritis worse at night?
9. Why does osteoarthritis cause fatigue?
10. What does arthritis in the knee feel like?

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19. #joint