摘要
目的 采用数值模拟方法,建立人体膝关节肌骨系统生物力学模型,并将人体动力学模型模拟跳跃运动时所获得的运动学和动力学信息作为模型驱动数据,进而分析不同热力耦合护膝条件下膝关节半月板的应力场分布特征。方法 基于受试者CT与MRI断层扫描图像,构建包括骨、关节软骨、半月板、韧带和膝关节外围软组织的较真实人体膝关节模型,依据跳跃运动全周期分析选择蓄力起跳、落地冲击两个半月板损伤风险较大的位姿步态进行模拟,分析4种不同热力耦合护膝条件下膝关节半月板的应力场特征,讨论半月板峰值应力及其应力集中区域的变化,探究半月板损伤以及佩戴护膝的防护功效和力学依据。结果 膝关节内侧半月板前角是应力集中的易受损区域;在热力场耦合护膝条件下,内侧半月板应力集中区域由其狭长且薄弱的前角转移至其较为宽厚的中部,且峰值应力显著降低;内、外侧半月板的峰值应力接近,表明两者共同承担外载,且半月板应力集中区域面积减小。结论 热力场耦合护膝对于膝关节半月板的损伤具有良好防护作用。数值模拟研究结果可以为热力多功能护膝的设计提供理论支撑和技术指导。
Objective The biomechanical model for the musculoskeletal system of a human knee joint was established using a numerical simulation method.The kinematic and dynamic information captured during jumping motion simulated by the human dynamic model was used as driven data of the knee biomechanical model,followed by further analysis of the stress field distribution characteristics of the meniscus under different thermal-force coupling knee brace conditions.Methods Based on computed tomography and magnetic resonance imaging of the subject,a realistic human knee model,including bone,articular cartilage,meniscus,ligaments and peripheral soft tissues of the knee joint,was constructed.Furthermore,two gaits,namely taking-off and landing-on,of jumping motion with an increased risk of meniscus injuries were selected according to mechanical features in full-cycle jumping motion.Subsequently,the stress field characteristics of the knee meniscus under four different thermal-force coupling knee braces were analyzed,the changes of the peak stress of the meniscus and its stress concentration area were discussed,and the protective efficacy and mechanical basis of meniscal injuries and wearing knee braces were explored.Results The anterior part of the medial knee meniscus was a vulnerable area under concentrated stress.Under the knee brace thermal-force coupling condition,the stress concentration area of the medial meniscus was transferred from its narrow and weak anterior part to its wide and thick middle part,and the peak stress was also significantly reduced.The peak stress on the medial meniscus and that on the lateral meniscus were similar,indicating that the two parts of the meniscus bore the external load evenly,and the meniscus stress concentration area decreased.Conclusions Thermal-force coupling knee braces have good protective effects against knee meniscus injury.The numerical simulation provides theoretical support and technical guidance for the design of multifunctional thermal knee braces.
作者
阮江涛
孟洋洋
张银光
肖霞
RUAN Jiangtao;MENG Yangyang;ZHANG Yinguang;XIAO Xia(School of Aeronautics and Astronautics,Tiangong University,Tianjin 300387,China;Department of Orthopedic Trauma,Tianjin Hospital,Tianjin 300211,China)
出处
《医用生物力学》
CAS
CSCD
北大核心
2024年第1期111-117,共7页
Journal of Medical Biomechanics
基金
天津市应用基础多元投入基金项目(21JCYBJC01400)
天津市卫生健康科技项目(ZC20053)。
关键词
半月板
热力耦合
护膝
应力场
跳跃运动
数值模拟
肌骨系统
meniscus
thermal-force coupling
knee brace
stress field
jumping motion
numerical simulation
musculoskeltal system
作者简介
通信作者:肖霞,副教授,硕士生导师,E-mail:xiaoxia@ tiangong.edu.cn.
