13 days ago I got in a fight with my brothers and hurt my left knee. There has never been a lot of pain in the knee but it did have a serious amount of discomfort after the injury. For the first 8 days there was weakness in the knee and it would occasionally buckle under me while walking and if I bent my foot in towards my body or out away from it when standing the inside of the knee on either side of the patellar tendon felt like something was pulling (in the lowest portions of the knee). The immediate signs of the injury was slight swelling and the discomfort but after the swelling went down I did get some bruising on the outside portion of the top of the tibia, the bruising is gone now but there is still some slight swelling.
I went to the doctor and he found nothing wrong with my knee.
It's been another 5 days, 13 in total, and while the weakness has gone away I still feel the pulling when twisting my knee in either direction or when my foot is flat on the floor sitting in a chair when I bend my knee in or out.
Is this a sprain? An ACL strain? A patellar tendon bruise? A hyperextension? I want to know because I'm a college athlete and I want to resume my summer training but I am afraid to without having some idea of what may be wrong with my knee and what affects lifting weights and running might have on it.