Hi Socks,

You sound frustrated! I don't have something like that, but can empathize with you. Everyone always suggests swimming, but it isn't the easiest thing to access. Have you tried bike riding? Like an exercise bike or your own bike on a training stand? Also, do you have a leg length difference? That can contribute to finding many activities difficult (your dr would be able to tell you based on your x rays if you have ones that show the whole femur).

What about something you could do at home, like a yoga video or pilates floor mat video? They can be pretty hard, but not always aerobic. If you do some free weight circuit training, that keeps your heart rate up and can give you the aerobic boost if you do it the right way.

Have you seen a physio about this? A good physio might be able to give you some more suggestions, or design an exercise program you cuold do easily at home.