The project focuses on developing mathematical tools to improve the accuracy of Cobb angle measurement, which is used to assess spinal curvature in humans. Traditional measurement approaches may produce errors in the presence of spatial spinal deformities, such as vertebral rotation. This study investigates how vertebral rotation affects the Cobb angle and introduces a method for its more precise calculation. It is proposed to use a parabola for mathematical modeling of the shape of the human scoliotic spinal curve. Based on the project findings, a simple computer tool is suggested, which can enhance the accuracy of Cobb angle measurement and assist in monitoring changes in spinal condition over time.