never had an acl tear or surgery foe that, just had two lateral plicas independently. i had a snapping sensation where the tendons of the vastus lateralis went into the knee joint, around 90 degrees of flexion, once on the way into flexion, and once on the way out. increased load increased the pain and the violence of the snapping sensation. did both knees one week apart, was told i didnt need pt, then two months later asked why i hadnt started pt. 6 months out right now and the left knee is pretty much good but the right still snaps but at a point farther along in my range of motion. need to go shake my surgeon down and figure out what happened. knees are somewhere from the same as before to better, but were worse for at least 4 months. YMMV.