Abstract: Purpose: This paper aims to discuss the influence of knee injuries on joint load and position biomechanics after changing landing techniques. Method: In the research, twenty female students majoring in football are chosen to finish two unexpected tasks (side dodging and cutting, and turnaround), using front feet touchdown and hind feet touchdown respectively. Repetitive measurement deviation analysis is performed to assess the differences of kinematic and dynamic parameters in every landing technique. Result: when the front feet touch down, adduction torque of the knee joint is markedly higher than that when the hind feet touch down (p<0.001). In side dodging and cutting movement, eversion of knee joint is increasing when landed on hind feet. While in turnaround, eversion of knee joint is obvious only when landed on front feet (p<0.05. Conclusion: there are inherent differences between biomechanical results of different feet touchdown skills. Moreover, front feet touchdown exerts not only an increasing influence on the load of knee adduction torque, but also greater potential tension on the ACL.

Key words: knee joint injury, joint load, ACL, landing technique