Another thought; almost anything's cardio if done with light enough weights. The gym I go to has an assisted pull-up/dip machine. You set the weight stack to counterbalance your own weight to a greater or lesser degree. If you're moderately light, you can cancel a great propotion of your body weight. I could see an upper-body cardio routine, alternating between dips and pull-ups at light resistance, that would give you a really interesting workout with no load-bearing on either leg.
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