This page is aimed at those patients wishing to consider medical choices, specifically those about whether a particular operation or procedure is appropriate for your personal circumstances and preferences.
This site contains links to the many NHS Decision Support Aids:
http://www.rightcare.nhs.uk/index.php/shared-decision-making/about-the-pdas/ (general PDA index)
Specifically for Knee Arthritis:
Specifically for Hip Arthritis: