Taiyuan Ligong Daxue xuebao (Jan 2021)
Mechanical Analysis of Human Kyphosis Correction
Abstract
Most of the clinical non-surgical methods for the correction of mild kyphosis are to wear kyphosis orthosis, to apply a forward force perpendicular to the spine to the kyphosis, which is generated by the shoulder belt of the orthosis acting on the shoulder. The research on the relationship between orthopedic force and orthopedic angle has not been reported yet, and the relationship between them is of great significance for the design and optimization of orthopedics. In this paper, the method of photography was used to record the kinematic data of the mark points of the cervical vertebra and the thoracic vertebrae in the process of kyphosis orthopedic; the orthopedic pull force perpendicular to the spine along the sagittal direction was provided and recorded by Instron 5544; J image processing software was used to conduct non-linear fitting analysis on the collected image sequence and quantify the corresponding relationship between the effective orthopedic force and the orthopedic angle of kyphosis, and finally a general formula was established for calculating the orthopedic angle and corresponding orthopedic force by taking into account the factors of gender, height, body mass index, upper body length/height, outer shoulder width, sitting height, and sitting shoulder height/sitting height. The results show that the relationship between the orthopedic force and orthopedic angle can be expressed as a cubic function, and the regression coefficient R2 is greater than 0.99; the P value of the fitting regression equation, which takes into account the data of individual factors such as height and weight, is less than 0.05, and the significance of the fitting equation is good; and the general formula of the fitting orthopedic can be applied to the initial calculation of required shape correction force according to height, weight, and other dimensions combined with the orthopedic degree.
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