There is No Known Cause
Adolescent idiopathic scoliosis (AIS) includes the word idiopathic because its cause is unknown. Despite common misconceptions, scoliosis can’t be caused by playing sports, bad posture, or carrying heavy backpacks.
Children diagnosed with this condition experience little to no discomfort and can still engage in normal physical activity. Doctors recommend that exercise and active play be limited to the child’s level of ability and comfort, but assure parents that sports can neither cause nor increase the effects of scoliosis.
Source: Healthscope Magazine (2016, May). Six Facts About Scoliosis Every patient Should Know.