
If you compare a score of 18 to the US scoring system it would still be in the normal range with a rating of fair. 19 to 25 would rate Borderline, and Mild dysplasia would be 26 to 35.
As the bred avewrage score is 13 I would be looking for the bitch to be scoring low, and the dog to be outstanding inother ways to Justify using him, but I wouldn't expect such a score to be a problem.