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Sway posture is one of many posture faults, but it's too important because it's common, around 90% of people have sway posture.
and it contributes to low back pain specially in those who sit for long time.
Lets begin with small definition of the ideal posture:
pelvis is tilted a 30 degree angle between vertical and the plane that passes through the top of the sacrum and the axis of the hip joint socket located in front of plumb line (an imaginary straight line from the top of the head to the floor)
In a swayback, the pelvis is tipped forward around 40 degree, and lumbar move to exaggerated curve in the low back (lordosis) and thoracic spine in (kyphosis.)
A) Side view: backward movement of the entire thoracic spine. This area of the spine tends to elongate,
B) front view :the chest tends to sink.
Weak: -abdominal obliques
Overactive: -Erecto spinae
Sway back need a corrective exercise program for re-balancing the imbalanced muscles
Strengthening core muscle
Re-education for the patient.