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Let me tell you something you might not know about treadmills.
When you run, and you have a good running shoe on, your foot impacts the ground (a solid object) and rebounds directly back. Much of this rebound is sucked up in your running shoes and the remained is sucked up in your knees.
When you run on a treadmill, your feet are impacting with a moving object. Even the very best treadmills will have a small amount of movement both back and fourth and up and down. What this means is the forces being transfered back at your knees are not linear. The ligaments in your knees are left to deal with this side to side and up and down motion.
So the morale of the story is the treadmill should be your last option. If you're going to use a treadmill, crank the incline way up and the speed way down so it's more like a power walk up a hill.
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