I injured my knees through irish dancing?

i injured my knees about 2 years ago through irish dancing. I went to the doctors twice and then to the hospital for an x-ray. They told me i sprained a ligament in my knee so i stopped my dancing for a few months and everything. After i went back and i would do all the dances it would hurt so i stopped completly and now i get pain in my knees all the time whether it be walking to school walking up and down the stairs even as im laying down it feels like its twisted so i have to lift it up straight and it would be ok for a while and when im on the trampoline my knees would collapse after about 5 minutes of jumping on it. I was just wondering is their anything else i could have done to it