I shoveled the walk and driveway three times so far this season and I destroyed my left thumb joint. Apparently, when you are my age you automatically have arthritis in your thumb joint. It is just a given. It never bothered me until I made like a snowplow with the shovel handle and pushed and dumped snow into a pile. After two hours of that, it kind of hurt. Then again and again and ouch! The doctor gave me a shot which hurt worse than the actual injury. I am never doing that again.