"So, what is a bad hip/knee?" Hang in there and sooner or later you may out. But, in all honesty I hope you never do find out. I've discovered that the much less expensive aluminum roll up chairs with arm rests from wally world or the like, is the better choice. $10.00 or less and they are very lightweight. I have two i roll up and carry bunged to my trunk rack when i feel we'll need them. If and when they break, or get swiped at a large gathering (like ours did once), no big loss.