
In FCI where A-E is used the results and what they are vary by country too.
In my country of origin they are much tighter, so some people are traveling across the borders to get xrays done in a different country to get good results on the paper!
So much so Kennel club will now state xrays taken abroad, if any finnish registered dog gets them done across the borders(I suppose this is to point out the score was not given by Finnish KC).
So just as an example dog that scores A in France, might score C in Finland... It all is up to the panelist who is scoring the xrays.
A1 is better than A2, B1 is better than B2...
A&B are generally seen as acceptable score to breed from(across most breeds), sometimes C...
D&E are seen as pretty bad and should not be bred from in most breeds and many kennel clubs will not register puppies off parents that have such hips.
But of course in some breeds where scores are high in general, these dogs do get used as well and Kennel clubs have more loose registration regulations.
Newfies being one, just as an example in Finland between 2000-2008 44% scored D or E...