A few years ago about 2 weeks before my motorcycle Ohio course I broke my arm in a quad accident. I showed up to class in a cast, they looked at me like I was nuts and asked me if the DR. ok me riding I told them no but was still going to take the class. Then they asked if I was going to be able to operate the bike safely, I said I'll try. Long story kinda short, I passed with flying colors actually the highest score in the class 100%. If you feel like you can handle it, go for it. Ride a short distance and see how it feels. If its not too awful ride more just don't hurt yourself cause you want back on. On a side note my DR was pissed when I showed back up to the office with my cast packed with mud from hill climbing and flipping the quad.