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Idiopathic scoliosis is a multi-factorial condition which means it is a combination of genetic pre-disposition and environmental influences (like exercise and sports).  This study below is a perfect example of how large a role environmental influences can play in scoliosis curve progression.

The role of exercising in a pair of female monozygotic (high-class
athletes) twins discordant for adolescent idiopathic scoliosis

Potoupnis, Michael E.; Kenanidis, Eustathios; Papavasiliou, Kyriakos A.; Kapetanos, George A.] Aristotle Univ Thessaloniki, Sch Med, Papageorgiou Gen Hosp, Dept Orthopaed 3, GR-54006 Thessaloniki, Greece.
SPINE. 2008 (33) P.607-610

Study Design. The report of 2 cases and review of the literature.
Objective. To report the cases of a pair of female monozygotic
(high-class athletes) twins discordant for adolescent idiopathic
scoliosis.
Summary of Background Data. The relation between scoliosis and
exercising is rather unclear. The latter has often been considered both
as a therapeutic means and a causative factor of the former. The
existence of genetic predisposition in the development of adolescent
idiopathic scoliosis is commonly accepted. According to the best of our
knowledge, this is the first report of a pair of female monozygotic
(high-class athletes) twins, discordant for adolescent idiopathic
scoliosis.
Methods. A pair of 13.5-year-old female monozygotic twins, high-class
level athletes of synchronized swimming, was clinically examined during
a school screening program. Both girls were observed in the standing
erect position for asymmetries of the lateral contours of the trunk,
shoulders, and scapulas and their limb's length was measured. The
"forward bending test" was performed to determine the existence of rib
hump asymmetry.
Results. One of the sisters was considered to be suspicious of
suffering from scoliosis. The radiologic evaluation that followed
confirmed the existence of adolescent idiopathic scoliosis (left
thoracolumbar curve of 32 as measured by the Cobb angle). The clinical
and radiologic evaluation of her sibling failed to reveal the existence
of any spinal deformity.
Conclusion. Adolescent idiopathic scoliosis seems to be a
multifactorial skeletal disorder. The role of exercising and heredity
in its development remain controversial.

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Thoracospinal concept - girls with right thoracic adolscent AIS only

Dr Sevastik developed a "thoracospinal concept" based on experimental, clinical, and anatomical data and it only applies to females with right thoracic curves.

His 6 steps has a linear causality mechanism......

1. Dysfunction of the automomtic nervous system (which is responcible for involuntary neurological postural control)
2. Increase vasularity of the left anterior hemithorax
3. Overgrowth of the left peri-apical ribs which......
4. disturbs the equilibrium of the forces that determine normal alignment of the thoracic spine, in a putative growth conflict, that......
5. triggers the thoracospinal deformity simultaneoulsy in the three planes.
6. Biomechanical spinal growth modulation.


Basically, he is staying that asymmetrical blood flow between the left (increased) and right (decreased) to the anterior chest wall which causes and elongation of the left ribs.