"Delay in ossification of hip joints" - am I familiar with this diagno…

"Delay in ossification of hip joints" - am I familiar with this diagnosis? And what did they do? How were they treated? When did the bones appear? To the orthopedist only tomorrow, but I can't wait. They said that the main thing is no dysplasia, everything is formed correctly, increased the dose of vitamin D - 3-4 drops per day.