My MRI report said "there is linear intrasubstance signal within the posterior horn of the medial meniscus, but no discrete surfacing tear." The images and report are with a second facility today, getting a look over for a second opinion. I woudln't say my knee locks. I would say it's stiff and still slightly swollen (6 weeks post injury) and that's what is preventing me from straightening it out completely. Just my non-professional opinion. I can easily straighten it out about 97% of my normal, and can walk mostly normally most of the time....no running or jumping yet of course (there's also diffuse bone bruising in there). I can straighten it out all the way, but it takes a bit more effort do so that with my "good" leg. No real pain unless I jar it or have accidental impact (again, the bruising). It is getting better (albeit very slightly) each day -- no backtracking. I don't think I have a meniscus tear, just the diffuse bone bruising....but I want to be sure, of course.