there is nothing wrong with ofa fair to ofa good !
what needs to be examined is the orthopedic status deeper into the pedigree. That means the mother's litter mates , her sire , her dam, their production record . Similarily the sire, his litter mates, his sire , his dam , their production record.
do you have one of the progeny , and are you worried and have you done x rays.
orthopedic health is multi factorial which means that genetics (indirect mode of inheritance) and environment and NUTRITION play a role.