Hi. I too have Developmental Dysplasia of the hips, bilateral and had an osteotomy as a 10 year old. Now at age 56, I am readying for THR in December.
I would recommend a online support group: hipwomen@yahoo.com
My understanding is through proper selection of the right sized femoral head prothesis and preparing the femor for length equaling, leg length differences of such a small size are easily resolved.
Good luck to you.
LaurenM