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Lung volume lower in children with mild idiopathic scoliosis

05 Aug 2017

Children with mild idiopathic scoliosis (IS) have a higher angle of lateral curvature and loss of normal thoracic kyphosis that both result in reduced lung volume, a new study has found.

A sample of 68 paediatric patients (mean age 11.33±0.87 years) with mild idiopathic thoracic scoliosis under conservative physiotherapy treatment was subjected to a Moiré topography (MT) examination to determine body posture and a spirometric examination for basic ventilatory parameters including forced vital capacity (FVC) and forced expiratory volume in 1 second (FEV1).

Indices measured in the MT were angle of the major vertebral lateral curvature (ALC), kyphosis length (KL), kyphosis depth (KD), kyphosis index (KI), rotation at the apex of kyphosis (RK) and rotation at the apex of the major curvature (RALC).

The mean VC indicator (VC%) of the cohort was 91.48±22.67 with values ranging from 48 to 163 percent. Lung VC was below due value (VC% <75 percent) in 25 percent of the patients, within due norm (75 percent < VC% <100 percent) in 38 percent and above due norm (VC% >100 percent) in 37 percent.

Participants were then divided into three according to ALC measurements: ALC between 5 to 10 degrees (A1; 33 percent), ALC between 11 to 20 degrees (A2; 33 percent) and ALC between 21 to 30 degrees (A3; 34 percent).

Vital capacity showed a fairly significant association with ALC (R, -0.53; p<0.001) and RALC (R, -0.37; p<0.01) in children in the A3 group, indicating that in these patients VC decreased as a result of increases in either parameter, researchers explained.

In general, VC was more significantly correlated with the kyphosis parameters KD (A3: R, 0.61; p<0.0001) and KI (A3: R, -0.42; p<0.001), which suggested that thorax deformity had a greater impact on VC.

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