Never said that was all. Littermate has elbow OCD. Too much jumping to conclusions going on.

Orthopedic surgeons are finding that if a dog is affected with OCD in both joints, whether that be hocks, shoulders or elbows, that it is genetic.
When my girl produced the one OCD puppy, she had also produced entropian and had a daughter who failed her hips so I decided to cut her free from my breeding program. If I had had no other issues in these lines I used to have, I would have tried to breed her to another stud dog. So to the original poster of OCD, if you have not had any other orthopedic issues in your bitch of the 2 affected OCD pups, it could be that your girl and the stud dog lines did not mesh. You can follow certain lines and see that they clearly produce kids that end up with orthopedic issues being bred to many many bitches. When this happens, you can conclude that OCD is not inconclusive.