الفهرس 
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Abstract
Scoliosis is a three dimensional deformity of the spine in coronal, sagittal and axial planes. It is described as a structural lateral deformity of spine curvature. However, the scoliosis also manifests itself as an axial rotation of the vertebrae into the convexity of the curve.
The quantification of the severity of the scoliosis is based on the Cobb method, which measures the angle of the curvature of the spine. It can affect pulmonary functions by many ways including restrictive lung diseases with further deterioration of pulmonary functions.
This was a prognostic cohort study was conducted on 30 patients in Nasser Institute for research and treatment hospital from November 2018: December 2019 diagnosed as adolescent idiopathic scoliosis to study the effect of scoliosis correction surgery on the pulmonary functions.
All the included patients were subjected to full history taking, clinical examination and investigations including pulmonary functions before and 6 months after surgical correction of scoliosis.
Our results revealed; the mean age of patients was (14.067) years with SD (2.083), mean height was 152.633, mean weight 44.767, mean BMI 18.381 and mean vertebrae were 11.7, the majorities of them were female (70 %), male (30%).
Forced vital capacity decreased after post -operative compared with pre-operative but with no statistically significant difference, also vital capacity decreased after post-operative compared with pre-operative but with no statistically significant difference (p-value >.05).
There was no statistically significant difference as regards FEV1% changes before and after operation. Also, FEF25-75% changes before and after operation showed no statistically significant difference (p-value>.05).
Patients received spine posterior fusion correction surgery. The average Cobb’s angle in the coronal plane was corrected from 57.333 ± 13.629 preoperatively to 21.200 ± 7.227postoperatively, with mean deference 36.133, with statistically significant difference between before and 6 months after surgery with P-value <.001.
Correlation between FVC% and VC% with Cobb angel is reversible relation, where when Cobb angel increases FVC% and VC% decreases with P-value<.001.
Finally, we concluded that no significant difference was found between pulmonary functions before and 6 months after surgical correction of scoliosis, although there statistically negative correlation between Cobb angel, FVC% and VC% before surgery.