Does anyone have any experience with hip dysplasia? I was surprised to find nothing when searching this site

We took our daughter for her four month vaccinations the other day, which she handled like a champ, however when the doctor examined her she said she was referring us for an urgent ultrasound to check for hip dysplasia, as her top-of-thigh creases were not symmetrical.

Initially we weren't too worried, as we thought it was a just in case, better safe than sorry kind of thing, but since the appointment, we have been examining our babe's thigh creases and are now more worried that there is something wrong.

If she does have H.D., luckily she is young enough for it to be treated with a harness rather than surgery, but the harness experience sounds really distressing. We keep telling ourselves it would only be a few months (hopefully) and things could be much worse, but we're just feeling stressed and worried for our babe.

Has anyone else had any experience with this? Anyone had an ultrasound which showed no signs of H.D.? Or if your child has or had it, how was the experience for them and you?

Thank you in advance for any advice, or just reassurance! We're trying to take things one step at a time, but it's so hard...