I Have Knee Pain Since Past 3 Weeks But I

i have knee pain since past 3 weeks but i ignored it and kept my regular routine and sport, a day before i went to doctor, he checked x ray nd it was normal, he then said i have broken my ligament and recommended mri, till my mri appointment he asked me to wear a knee mobilizer, my knee doesnt hurt so much however there is mild pain and tenderness between knee cap and shin bone. i am a regular runner, will i be able to get back to my sports routine again. is it a serious damage? note that i was i can run and dance normally but with some pain