Injuries on lower-extremity joints were caused by high impact force in parachuting landing. Knee brace was used to protect knee by restraining motion of knee. Backpack was necessary in parachuting landing and would increase lower-extremity joints injuries. This study aimed to analyze kinematics and kinetics of hip, knee and ankle for investigating multi-joint protection of knee brace for those joints in parachuting landing with backpack. Seven participants landed from 120 cm height. Kinematics and kinetics of hip, knee and ankle were analyzed. It was found that without backpack knee brace decreased angular displacements of hip (12.0%), knee (10.3%) and ankle (18.6%) on sagittal plane and angular velocities of hip (11.9%), knee (6.6%) and ankle (20.9%) on sagittal plane. With backpack, knee brace decreased angular displacement (5.5%) and angular velocity of knee (6.2%) on sagittal plane, but did not significantly influence those of hip and ankle on sagittal plane. Ground reaction force, joint moments and joint energy absorptions were not significantly influenced with knee brace. In conclusion, in parachuting landing without backpack, knee brace could provide multi-joint protection for hip, knee and ankle. In parachuting landing with backpack, knee brace could still protect knee, but could not protect hip and ankle.

下肢关节受伤是由跳伞着陆时的高冲击力造成的。护膝用于通过限制膝关节的运动来保护膝关节。背包在跳伞着陆时必不可少，会增加下肢关节损伤。本研究旨在分析髋关节、膝关节和踝关节的运动学和动力学，以研究护膝在背包跳伞着陆时对这些关节的多关节保护。七名参与者从 120 厘米的高度着陆。分析了髋关节、膝关节和踝关节的运动学和动力学。结果发现，没有背包护膝时，矢状面的髋关节 (12.0%)、膝关节 (10.3%) 和踝关节 (18.6%) 的角位移以及髋关节 (11.9%)、膝关节 (6.6%) 和踝关节 ( 20.9%) 在矢状面上。使用背包，护膝减少角位移 (5. 5%) 和膝关节角速度 (6.2%) 在矢状面上，但对髋关节和踝关节矢状面上的角速度没有显着影响。膝关节支具对地面反作用力、关节力矩​​和关节能量吸收没有显着影响。综上所述，在没有背包的跳伞着陆时，护膝可以为臀部、膝盖和脚踝提供多关节保护。背着背包跳伞着陆时，护膝仍然可以保护膝盖，但不能保护臀部和脚踝。