shouldn't be injury unless he jumped off of the bed wrong. he pretty much just eats, goes to the bathroom, hops on my bed. in the evening he'll come down the hall to visit for a couple of hours.
I'll keep track of it. it was the first time, but it was pretty apparent and definitely debilitating for him. but within a couple of hours he could jump and hasn't had trouble since... maybe arthritis/cramp. maybe start him on the methyl b12, just in case since he is 15