I have not heard of the ortolani test. X-ray appear normal. I would probably just do regular exercise to strengthen the muscles, and keep the dog lean and fit.
Puppies can be loosey-goosey. I don't know if this will be a problem down the line or not. But I think clear x-rays at this point are actually a good thing. And, some puppies that do not have HD do bunny-hop.
Heidi Ho, Odie
Joy-Joy, Bear Cub, Hepsi-Pepsi
Cujo2, Karma Chameleon
Ramona the Pest, Kojak -- who loves you baby?
Tiny Tinnie, Susie's Uzzi, Kaiah -- The Baby Monster.