Knee Joint Load Characteristics of Table Tennis Players' Main Offensive Techniques.

Purpose: To understand the biomechanical load characteristics of knee joint of table tennis players in the process of completing three main offensive techniques. Methods: Using three-dimensional kinematic images and inverse dynamics calculation, the kinematics and dynamics characteristics of lower limbs of 10 male and 10 female national table tennis players in the process of completing the three main offensive techniques were analyzed. Results: The players showed a smaller knee joint flexion angle when they completed the forehand stroke technique (P < 0.05), and a smaller knee joint internal rotation angle when they completed the backhand pull loop technique (P < 0.05). The knee joint receives the largest force in the vertical direction, and the knee extension moment is also the main moment. Compared with female athletes, male athletes showed greater knee abduction angle (P < 0.05), greater knee flexion angle (P < 0.05) and greater forward force (P < 0.05) when completing the three techniques. When the male athletes completed the backhand pull loop, they received less left and right forces than the other two techniques (P <0.05), while the female athletes had no significant difference. Conclusion: The knee joint flexion angle of the male players was larger than that of the female players when the three offensive techniques were completed, and the knee joint angle of the forehand stroke was smaller than that of the other two. The knee joint load of table tennis players is mainly from the vertical direction of the force and knee extension moment. Compared with female athletes, male athletes had more load on their knees when they completed the three offensive techniques. In addition, the risk of knee injury was lower when male athletes completed the backhand pull loop than the other two techniques, while the risk of knee injury was similar when female athletes completed the three techniques. [ABSTRACT FROM AUTHOR]