I fell on my right knee/leg 3-4 weeks ago and it was swollen pretty bad for a while. The swelling has subsided some but half hurts when touched the other half is pretty well numb all the way to the side of my leg just below the knee..I have trouble walking up stairs and cannot kneel
In my opinion you have ACL injury (can not control your knee) and meniscal injury i recommend a knee MRI to confirm Good Luck