Biomechanical Analysis of Scoliosis Orthopedic Force Loading with Human Avoidance Effect

Abstract

Due to the lack of human avoidance analysis, the orthosis cannot accurately apply orthopedic force during orthopedic, resulting in poor orthopedic effect. Therefore, the relationship between the human body’s active avoidance ability and force application is studied to achieve accurate loading of orthopedic force. First, a high-precision scoliosis model was established based on computed tomography data, and the relationship between orthopedic force and Cobb angle was analyzed. Then 9 subjects were selected for avoidance ability test grouped by body mass index calculation, and the avoidance function of different groups was fitted. The avoidance function corrected the application of orthopedic forces. The results show that the optimal correction force calculated by the finite element method was 60 N. The obese group had the largest avoidance ability, followed by the standard group and the lean group. When the orthopedic force was 60 N, the Cobb angle was reduced from 33.77° to 20°, the avoidance ability of the standard group at 50 N obtained from the avoidance function was 20.28% and 10.14 N was actively avoided. Therefore, when 50 N was applied, 60.14 N was actually generated, which can achieve the orthopedic effect of 60 N numerical simulation analysis. The avoidance effect can take the active factors of the human body into consideration in the orthopedic process, so as to achieve a more accurate application of orthopedic force, and provide data reference for clinicians in the orthopedic process.

摘要

由于缺少人体躲避分析, 矫形器在矫形时不能准确施加矫形力, 致使矫形效果不佳。因此研 究人体主动躲避能力与施力之间的关系, 从而实现矫形力的精准加载。首先基于CT数据建立高精 度的侧弯模型, 分析矫形力与Cobb角之间的关系;然后选取9名受试者按体重指数分组进行躲避能 力试验, 拟合出不同群体的躲避函数;最后通过躲避函数修正矫形力的施加。结果显示:偏胖群体 的躲避能力最大, 其次是标准群体、偏瘦群体;数值模拟分析矫形力60 N时, Cobb角由33.77°减 少为20°, 由躲避函数可得标准群体在50 N时躲避能力为20.28%, 主动躲避掉10.14 N, 因此施加 50 N时, 实际产生了60.14 N, 能够达到数值模拟分析60 N时的矫形效果。躲避效应可将人体主动 因素考虑到矫形中, 实现矫形力更加准确的施加, 为临床医师在矫形中提供数据参考。