Aim. The study of duodenal morphology in children and adolescents with skeletal deformity. Materials and methods. Clinical, hormonal examinations, x-ray investigation of the skeleton with spinal NMR-tomography, gastroduodenoscopy with target biopsy were performed in 41 patients aged 7 to 18 on aftertreatment for broken spine. Results. Atrophic duodenitis found in most of the patients presented without dyspepsia, with symptoms of duodenitis in 8 patients, osteoporosis in 36% of patients. NMR-tomography rejected compression-broken spine in 22 patients. Conclusion. Disturbed absorption of calcium and atrophic alterations in the duodenal mucosa are thought responsible for disturbance of calcium metabolism and formation of bone tissue.