For cardio without much knee extension or loading try kettlebell swings/snatches if you have access to them, or you can do dumbbell swings. If you've never done them before, go very light, like 25# and make sure you keep a lumbar arch and use hip extension to get the weight up. If you round your lower back you will feel it (even though it's light, the high reps will hit you). There are workouts like 10min of 1 hand swings/snatches without putting it down (one hand DB swing is hard, KB it's a lot easier). With a DB try 150 swings for time.
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