I bought Pinkie 1 a little over a month ago. I didn't know enough to be suspicious of her/his bent back. It wasn't extreme, so I initially thought it was within the normal range. After a bit I began to worry, but I hoped he/she would straighten out as he/she grew. I finally accepted he/she would remain a bit crooked; but since he/she often rested seemingly comfortably on decorations, I thought he/she would survive, just need some special care.
I am sad that little Pinkie 1 didn't beat the odds. Here are a few pictures.