الفهرس 
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Abstract
Study design: This prospective study included thirty patients with adolescent idiopathic thoracic scoliosis Lenke classification types 1, 2, 3 and 4.
Background data: Measuring the sagittal profile in patients with severe AIS is not an easy task because of the unclarity of the vertebral endplates in the thoracic region as they are usually obscured by soft tissue shadows and due to the rotational component of scoliosis. A new method of evaluating the thoracic modifier in adolescent idiopathic scoliosis depending on true lateral views of the fifth thoracic and the twelfth thoracic vertebrae using digital radiographs is evaluated.
Materials and methods: Males constituted 10% (3 patients) of the patients’ population while 90% (27 patients) were females. Their ages ranged from 9 – 36 years with a mean of 16.13 ± 5.62 years. Every patient was subjected to thorough clinical and radiological examination. A long-standing antero-posterior view was used to measure T5 and T12 CTAs. Thereafter, the tube was tilted according to the measured angles to obtain two lateral images, one focusing on T5 and the other on T12. Depending on these two images, T5 and T12 STAs were calculated. The cobb angle is equal to the summation of T5 and T12 STAs. PACS was used to measure all the mentioned angles to decrease the chances of human error and to improve the clarity of images.
Results:
• T5 STA ranged from -14.70º to 28.80º with a mean of 6.50 ± 10.11 while T12 STA ranged from 3.40º to 41.10º with a mean of 21.40 ± 8.49. The total thoracic modifier of the patients ranged from 3.10º to 51.0º with a mean of 27.58 ± 13.94 in which 10% (3 cases) were found to be Hypokyphotic (<10), 63.33% (19 cases) noticed to be normokyphotic (10-40) and the remaining 26.67% (8 cases) were Hyperkyphotic (>40).
• In the measured cases, hypokhyphosis was found to be mainly in the proximal and the ap