I have severe bone-on-bone arthritis of both knees. Walking is not an issue - I actually feel better when walking. I am worried about the standing in line however. Standing still becomes excruciating for me after about 10 minutes and then I have trouble getting moving again. I absolutely do not need a w/c as walking is the best therapy for my knees. Do they offer any options for those who have trouble standing in line? I'm not looking to bypass the line - just need to be able to sit and wait for my turn.