Help...i have been plagued by this knee problem for years which made me stop badminton. Recently i got back into the game thinking the problem is finally gone...recovered..etc. After playing for a few mths...it seems it becoming as bad or worst! Whenever i bend my right knee at 70-90 degrees...it felt so weak that i would just collapse on the floor. I have problems climbing up stairs & need support at times after games & this will persist the next day too. However..once the knee is throughly warmed up...the problem can just disappear & i can jump/move easily again. But after sitting ard for 5 mins or so...the knee gets 'cold' and the weakness appears again. By weakness i mean my right knee seems incapable of holding up to my weight & will collaspe anytime when i am bending. Is my tendon finished or wat... What can i do to? This problem is killing my game.