I'm watching reports of snowfall and dreaming about getting back on the mountain. The last few years have not been friendly to my body and I have general muscle weakness that limits me to using a walker or a wheelchair in normal activity. Last year I got out on the mountain with a bi-ski and had a blast. The night I was leaving I got a message from my doctor about severe bone weakness in my hips (avascular necrosis) and I've been scared to go back. Basically I'm just waiting for my hips to break (and hoping they don't). It seems like the hips would be relatively protected by the seat in a sit ski, but I'm wondering what kind of injuries people tend to get in a sit ski? Does anyone know?