Scoliosis is more than just a curve in the spine; it is a complex, 3D twisting of the backbone. While it can be caused by birth defects or tumors, the most common type-idiopathic scoliosis-appears in healthy teenagers for no clearly known reason.
The Theory of Balance Researchers believe that scoliosis might actually be caused by a "glitch" in how the body stays upright. Instead of the spine curving on its own, the curve might be the body's way of compensating for a poor sense of balance.
To stay balanced, the human brain relies on three main "inputs":
1. The Vestibular System: Located in the inner ear (detects movement). 2. Proprioception: The body's "inner map" (sensing where your limbs are). 3. Vision: Seeing the world around you to stay oriented.
The Goal of the Study Even though humans rely heavily on their eyes to stay balanced, the role of vision in scoliosis has not been studied very much.
This experiment aims to test the hypothesis that teenagers with scoliosis have trouble processing visual information to maintain their posture. By using advanced motion analysis, researchers want to see if a "misunderstanding" of visual cues is contributing to the spinal deformity.
Girls or boys aged 11 to 18 inclusive.
Patients with progressive idiopathic scoliosis
Candidates for either orthopedic (brace) or surgical (arthrodesis correction) treatment for which a pre-therapeutic multimodal assessment is planned.
Individuals with another musculoskeletal disorder.
Individuals with a neurosensory disorder that may affect the balance of the trunk or lower limbs.
Individuals with uncorrected visual perception disorders (visual check within 12 months prior to the examination).
Lack of consent from the subject.
Single group
Motion Analysis
Other interventionResearchers use motion capture to track exactly how a patient's body moves and shifts in response to different environments.
Margin of Dynamic Stability
This measures how close a person is to losing their balance while moving. It calculates the distance between where the body's weight is moving and the edge of the person's "footprint" (base of support).
Center of Pressure
The point on the ground where the most weight is being concentrated. Tracking how much this point "wobbles" or shifts shows how hard the body is working to stay upright.
Extrapolated Center of Mass
A calculation that looks at both the position of the body and its velocity. It helps researchers predict if the person's momentum is about to carry them off-balance.
Base of Support
The total area on the ground occupied by the feet. A wider BoS often suggests the subject is trying to create a "wider stance" to feel more stable.
Visual Field Perception
The "Distance Error." Using a joystick, the patient tries to place a 3D avatar exactly halfway between two other figures. The difference between the true middle and where the patient thinks the middle is reveals if their depth perception is distorted.
Subjective Visual Vertical
Angular Error. A glowing line is tilted on a screen, and the patient must tell the operator how to rotate it until it is perfectly vertical.
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