I am waiting for a total knee replacement and have been thinking of getting an electric trike. I have osteoporosis in both knees but the one I had a motorcycle accident with in 1971 has gone completely bone on bone. I am unable to walk without a stick. Would a electric trike be good as when I have had the operation I will need exercise Just wondering on thoughts or experiences. Don't want to spend too much as I hope to be able to continue enjoying cycling on my other bikes one of which is electric but can't get the confidence to ride it at the moment.