摘要
目的通过构建3个不同角度的全足三维有限元模型,施加重力模拟舞蹈演员踮脚站立的工况,以此探究舞蹈演员多发跖趾关节炎的生物力学机制。方法利用石膏托固定研究对象的足踝关节后拍摄全足CT图像,构建出包括骨与足周围软组织及关节韧带的全足三维有限元模型,并对模型设定边界条件、施加载负并进行应力分析,研究舞蹈演员踮脚站立时的全足应力分布情况。结果分别建立中立位,跖屈20°,跖屈40°的全足三维有限元模型,施加载负后有限元分析的结果表明,站立平衡时随着踮脚角度的增加,前足应力向跖趾关节集中,其中第2、3足趾的应力变化最大,第2跖骨的最大应力值从4.77 MPa增加到34.61 MPa,第2近节趾骨的最大应力值从2.38 MPa增加到166.40 MPa,第3跖骨的最大应力值从4.53MPa增加到30.21 MPa,第3近节趾骨的最大应力值从2.19 MPa增加到157.80 MPa。结论舞蹈演员踮脚站立时的角度越大,第2和第3跖趾关节附近应力值迅速增大,长时间的踮脚站立很容易造成跖趾关节炎,引发前足疼痛。
Objective To explore the biomechanical mechanism of dancers with multiple toe arthritis by constructing a three-dimensional finite element model of three full angles and applying gravity to simulate the working condition of dancers standing on their feet.Methods The full-foot CT image was taken after the ankle joint of the study object was fixed by plaster cast,and a three-dimensional finite element model of the whole foot including the soft tissue and joint ligament around the bone and the foot was constructed.The boundary condition was set and the load was applied and carried out.Stress analysis to study the distribution of full-foot stress during the dancer's lame standing.Results The three-dimensional finite element model of the full position of the neutral position,20°flexion and 40°flexion was established.The results of finite element analysis after loading showed that the forefoot stress was increased to the metatarsophalangeal joint with the increase of the angle of the ankle.Concentration,in which the stress changes of the 2nd and 3rd toes were the largest,the maximum stress of the 2nd metatarsal increased from 4.77MPa to 34.61MPa,and the maximum stress of the 2nd proximal phalanx increased from 2.38MPa to 166.40MPa,the maximum stress value of the third metatarsal increased from 4.53MPa to 30.21MPa,and the maximum stress value of the third proximal phalanx increased from 2.19MPa to 157.80MPa.Conclusions The greater the angle at which the dancers stand on their feet,the higher the stress values near the second and third metatarsophalangeal joints.The prolonged lameness of the feet can easily cause the toe arthritis and cause pain in the forefoot.
作者
徐志庆
刘云鹏
华国军
李坤
王星亮
Zhi-qing Xu;Yun-peng Liu;Guo-jun Hua;Kun Li;Xing-liang Wang(Department of Orthopedics,No. 101 Hospital of PLA. Wuxi,Jiangsu 214000,China)
出处
《中国现代医学杂志》
CAS
2019年第3期93-96,共4页
China Journal of Modern Medicine
基金
江苏省无锡市科技发展项目(No:CSE31N1618)
关键词
骨关节炎
有限元分析
生物力学
osteoarthritis
finite element analysis
biomechanics
