Juniper, i don't recall reading anything here against using it, but i'm sure that's true. My pt had me use it during rehab, when i was 3 or 4 months post op, but i remember having to back off of it for a while. My OS recommended my using weight machines for my legs when I saw him at my one year visit, so I assume this is what he meant. I'll soon be at the 18 month mark now. I've just started with 50 pounds, two sets of 10 reps. I'm taking it slow, leaving 2 or 3 days between to see if i get sore, if it bothers my knees at all, or it makes me feel stronger. Thus far, i'm going with stronger, and time will tell if that makes me more comfortable. I am well past the healing and recovery stage, although i could still show improvement, I suppose. I do believe this type of thing early on in recovery could be detrimental. I'm still walking and stretching in the pool, and that's always a good thing!