Markerless estimation of 3D Kinematics has the great potential to clinically diagnose and monitor movement disorders without referrals to expensive motion capture labs; however, current approaches are limited by performing multiple de-coupled steps to estimate the kinematics of a person from videos. Most current techniques work in a multi-step appr...
Published in Frontiers in Neurorobotics
Background Barbell squats are commonly used in daily training and rehabilitation. Injuries are not common when the posture is standard, but the wrong posture can lead to injuries. Rearfoot valgus is a common foot abnormality that may increase the risk of injury during sports. The purpose of this study was to compare the biomechanics of lower limbs ...
Published in Journal of orthopaedic research : official publication of the Orthopaedic Research Society
Torsional profiles of the lower limbs, such as femoral anteversion, can dictate gait and mobility, joint biomechanics and pain, and functional impairment. It currently remains unclear how the interactions between femoral anteversion, kinematics, and muscle activity patterns contribute to joint biomechanics and thus conditions such as knee pain. Thi...
Background: Changes in physical shape and body mass during pregnancy may increase the risk of walking falls. Shoes can protect and enhance the inherent function of the foot, helping to maintain dynamic and static stability. Methods: Sixteen women during the third trimester of pregnancy participated in this study to investigate the effect of negativ...
Published in Frontiers in Bioengineering and Biotechnology
Estimating kinematics from optical motion capture with skin-mounted markers, referred to as an inverse kinematic (IK) calculation, is the most common experimental technique in human motion analysis. Kinematics are often used to diagnose movement disorders and plan treatment strategies. In many such applications, small differences in joint angles ca...
Published in Chinese Journal of Reparative and Reconstructive Surgery
目的 旨在开发一种在保证骨肌运动分析过程和结果一致性前提下，提高骨肌运动分析效率的Matlab工具箱。 方法 采用“批处理驭繁琐操作”设计理念，基于Matlab连接OpenSim接口函数保证骨肌运动分析过程和结果一致性，应用函数式编程将骨肌运动分析所需模型缩放、逆运动学分析、残差缩减算法、静态肌力优化、关节力分析五步骤包装为功能函数，应用命令式编程对大批量患者进行骨肌运动分析，开发了一种名为LLMKA（Lower Limbs Musculoskeletal Kinematics Analysis）的工具箱。以120例膝关节内侧骨关节炎患者为研究对象，选择1位临床研究人员分别使用LLMKA工具箱和OpenSim对同1例患者进行骨肌运动分析，检验两种方法分析过程和结果是否具有一致性。同一位研究人...
Published in Journal of biomechanics
The residual reduction algorithm (RRA) in OpenSim is designed to improve dynamic consistency of kinematics and ground reaction forces in movement simulations of musculoskeletal models. RRA requires the user to select numerous tracking weights for the joint kinematics to reduce residual errors. Selection is often performed manually, which can be tim...
Published in Sports biomechanics
People with chronic ankle instability (CAI) exhibit neuromuscular deficits. However, no study has investigated deficits in forces or force-generating capacities of individual muscles in people with CAI during dynamic tasks. Therefore, the purpose of this study was to estimate and compare peak forces and force-generating capacities of individual mus...
Two-dimensional deep-learning pose estimation algorithms can suffer from biases in joint pose localizations, which are reflected in triangulated coordinates, and then in 3D joint angle estimation. Pose2Sim, our robust markerless kinematics workflow, comes with a physically consistent OpenSim skeletal model, meant to mitigate these errors. Its accur...
Published in Journal of applied biomechanics
Changes in knee mechanics following anterior cruciate ligament (ACL) reconstruction are known to be magnified during more difficult locomotor tasks, such as when descending stairs. However, it is unclear if increased task difficulty could distinguish differences in forces generated by the muscles surrounding the knee. This study examined how knee m...
