Let us hope to you full fast recovery.....
Yes,there is a relationship between spine,pelvis[ SI], many causes for
Scoliosis are there but mainly it would be muscular or bony and there is subtitles under each....
Leg length discrepancy plays role in uneven pelvic along with weakness of pelvic stabilizers[ muscles]....
According to angle and cause of scoliosis we can classify it to mild,moderate or sever..
Try to consult orthphysician and skillful physiotherapist,And you will be fine,,,,smile.....
Hope this could help