The folks who teach how to deal with prosthetics and/or uncooperative limbs are pretty amazing. After an incident resulting in a traumatic brain injury years ago, the doctors didn't think I'd be able to walk again. It was a long row to hoe, but I get around ok now, thanks to the physical therapists. I'll never be a ballet dancer, but I can live with that.
What was thought-provoking were the little rules they'd teach so you could deliberately control things that were previously autonomous. For example, when ascending/descending stairs, it was "good leg goes to heaven, bad leg goes to hell" depending on the direction you were going. In other words, If you led with your good leg going up, or your bad leg going down, it was a helluva lot easier to maintain your balance. How do they come up with that stuff?