Not just solely for knee surgery- but any surgery.
I had a bypass in 99 and it was a struggle initially to walk 100 yards to the local shop for a paper each morning- for a week or so. So I started walking into Town- about 1 mile each way and that was a real struggle but within a couple of weeks- I was doing it at 6mph into town and 4 mph back- must have been the weight of the paper slowing me down.
4 weeks after the surgery and I was back on the bike- for 100 yards- that did hurt. Within a month I did a 20 miler. and within 3 months I did a 40 miler that if I knew how hard it was going to be- I would have trained for.
Do not push yourself too hard too soon. Take things steady but just push the distance or the effort up gradually. Do not over-extend yourself but just go that little bit further or that little bit faster each time out- and I do mean just a little bit. And if it hurts- stop.
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How long was I in the army? Five foot seven.
Spike Milligan