I have knee problems for both of my legs. But especially I am very much uncomfortable with my left knee. I went to some doctor, he said after checking both my legs he wrote it as  Chondromalacia patella. Please diagnose it and let me know if it is a serious problem. I will play sports every week end for your information. Over strain on my legs causes pain. Does it require surgery or medicines or excercises or physiotherapy. Please suggest me on priority sir/ madam