Neuro-Osseous timing of maturation theory (NOTOM)

This theory was introduced in 2002 by Burwell and Dangerfield and it suggests that the maturation of postural mechanisms in the CNS may be complete about the same time in boy and girls and the higher prevalence of progressive AIS in girls may be the result of entering there adolescent growth spurt in postural immaturity vs boys whose later adolscent growth spurt occurs post postural maturity.

Essentially, they are viewing the problem as a discoordination between the Osseous (bone) escalator (increasing skeletal size, changing skeletal shape, and relative mass of the different body segments) and the neural escalators (postural maturation with the CNS body schema being recalibrated as it continually adjusts to skeletal enlargement, shape, and relative mass changes to enable it to coordinate motor actions.