This article is from the Rhodesian Ridgebacks Breed FAQ, by firstname.lastname@example.org (Richard Gordon) with numerous contributions by others.
Ridgebacks can come down with hip dysplasia. As in many breeds,
serious efforts are under way to eliminate the problem. The most
common tool is by rigorously certifying breeding stock by OFA,
Orthopedic Foundation for Animals. Good statistics are hard to find,
but according to some, there are fewer cases than Saint Bernards and
many giant breeds as well as medium sized breeds such as Golden
Retrievers and German Shepards. This is partly because of the relative
rarity of the breed. You should make sure that both dam and sire of
your prospective puppy have their OFA certification.