|（1.Guangxi Institute of Sports Science，Nanning 530031，China；
2.College of Human Movement Science，Beijing Sport University，Beijing 100084，China；3.Human Movement Science Center，University of North Carolina at Chapel Hill，North Carolina 27514，USA）
Abstract: The authors tested and analyzed the kinetic and dynamic indexes of such lower limb moves as jumping after a sudden stop, sideward dashing and forward dashing after vertical landing on the ground completed by 31 (13 male and 18 female) college students, so as to comprehend the effects of different anterior cruciate ligament injury risky moves and genders on the mechanical indexes of lower limbs. By using an infrared point movement test sys-tem and a force measurement deck, the authors measured the 3D angles of the knee joints and the 3D reaction forces of the ground during the testees completing the moves, and revealed the following findings: at the landing stage, the mechanical indexes of these three moves are significantly different, which proves that there is a difference between these three movement forms in the anterior cruciate ligament injuring mechanism; compared with the moves of jumping after a sudden stop and forward dashing after vertical landing on the ground, completing the sideward dashing move will subject to a bigger horizontal ground reaction force, and produce a smaller knee joint flexion an-gle and a larger knee joint abduction angle; at the landing stage, the mechanical differences between these three moves are not affected by gender.
Key words: sports biomechanics；injury risky moves；anterior cruciate ligament