My right rotator cuff ruptured, tripping over a large flower pot in the dark. It was ready to do so because a bone spur had partially cut through the cuff. Recovery took months (3 with no driving). Physical therapy was essential. But it's good. The other sholder's still a bit stiff from a strain (the orthopedist looked at it, no treatment required) back in November. These things are slow. For a short term alternative, maybe a Hawaiian paipo? They're designed to be propelled almost entirely by foot power.