Doctors have noticed that many children who have a dysplasia on one side, also have one on the contralateral or other hip as well, albeit very mild or moderate. The issue is, they don't know if the child is born with it and it's only discovered later on because it is so subtle or if the dysplasia develops over time as the child matures.

Regardless of the origins, many doctors are monitoring the seemingly not-affected hip to see what happens.