Advice on Knee !!

[APHP]

I had a sore knee last weekend. Nothing very painful, just more of an irritation. Then Tuesday have varsity boys & girls game. Wednesday AM knee was painful to walk. Went to Doc-inflamed cartilage of left knee. Gave me cortison shot and pills to take daily. Went easy on knee Wed & Thur. Did varsity girls & boys last night. Can hardly walk today. Next games are big tournament games begining next Wed. and I'm worried I want be able to go..anyone had cartilage problems of the knee before. How long was the recovery-any advice. Thanks