Well, there was the car accident, and I'm guessing this accounts for much of it. Likely broken ribs with the infections - coughing can do that, especially if yo

Well, there was the car accident, and I'm guessing this accounts for much of it. Likely broken ribs with the infections - coughing can do that, especially if you can't move your body into a better position. And then outside of this: It takes some practice to maneuver a wheelchair. You wind up hitting your foot and hands and things (or others can easily do this). I'm guessing there are times when things just go badly (wheel stuck in a rut) and he winds up on the ground, wheelchair over part of him. He probably has some bones that are more brittle than we'd expect because they don't regularly bear weight (legs). And don't forget, this is over 34 years with what seems like high risk factors and some unfortunate accidents over the time - and sometimes multiple breakings at once due to the accidents.