Why does my knee hurt going down stairs but not up?

Related questions

1. Why does my knee feel tight?
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4. What happens if osteoarthritis is left untreated?
5. Can arthritis be seen on xray?
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Tags

1. #patella
2. #affected
3. #chondromalacia
4. #first
5. #stair
6. #increasing
7. #syndrome
8. #another
9. #condition
10. #stairs
11. #obvious
12. #patellofemoral
13. #usually
14. #symptom
15. #little
16. #climbing
17. #treated