Aye. The one thing I don't like about leg extensions is the shear force it can place on the kneecap if the machine isn't set right. If your knee isn't pretty much flush with the edge of the seat, you're putting a VERY awkward force on your knee joint (and your entire femur, actually, all the way up to the hip joint).
Again, like the advice in gymtime's shoulder thread, the best thing to do is lay off for a bit, then come back and do some preventative stuff. Stick to the pressing motions and forget the extensions. Love your knees and they'll treat you right.
Again, like the advice in gymtime's shoulder thread, the best thing to do is lay off for a bit, then come back and do some preventative stuff. Stick to the pressing motions and forget the extensions. Love your knees and they'll treat you right.