This actually happened to me a couple of years ago (minus the weight gain thing). I blew my knee out playing hockey and was hardly able to walk for about 3 months. I just changed my gym routine to be all upper body weights, mostly machines. I lifted really light with a very high number of reps per set and I stayed in great shape.
While it's obviously not ideal, it worked for me. You just want to avoid lifting too heavy especially when you're not able to work out your legs. Afterall you don't want to be one of those stupid juice monkeys at the gym who can't wear shorts since they have a massive upper body being supported by two toothpicks for legs from never doing anything other than chest and arms.
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