Had ACL surgery 2 months ago; two nights ago; now feels like it did before surgery. Also have a sort of hard lump below the knee, sort of on the shin. The pain or uneasy feeling I get around the knee, is a sort of half moon shape. Stable, but when I walk, it sort of feels queer. Knee cap and inner lright side. When I fell, did not hear a pop; now however, I do hear some clicking when I extend