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Document Type

Abstract

Publication Date

12-1-2024

Abstract

Objectives: Stride is a typical type of footwork found in table tennis. During the game, athletes need to repeat stride movements at different angles according to the direction of the incoming ball, which makes the knee joint twist and flex, increases the burden on the knee joint, and increases the risk of knee injury. However, the effect of different angle stride movements on the load characteristics of athletes' knee joints is still unclear and needs further research. Therefore, this study used biomechanical research methods to explore the effects of 180° and 45° stride movements on the knee load characteristics of table tennis players.

Methods: Sixteen male table tennis athletes were selected to collect kinematic and dynamic data using Qualisys 3D motion capture system and AMTI 3D force plate at a frequency of 1000Hz, and the knee joint moment, anterior shear force, knee joint contact force and ACL force were calculated by using Opensim musculoskeletal simulation system, and these indices were standardized. The independent sample t-test was used to analyze the knee joint load characteristics of athletes with different angles of stride.

Result: The front shear force of the 45° step was 10.53±2.07 N/kg, the extension moment was 4.26±0.27 N·m/kg, the abduction moment was 4.52±0.78 N·m/kg, the medial compartment contact force was 12.9±3.27 N/kg, and the ACL force was 12.87±3.08 N/kg. The front shear force of the 180° step was 5.30±0.49 N/kg, the extension moment was 2.62±0.30 N·m/kg, the abduction moment was 3.52±0.32 N·m/kg, the medial compartment force was 6.35±1.67 N/kg, and the ACL force was 9.46±3.81 N/kg. The front shear force, extension moment, medial compartment contact force and ACL force of the 45° step were significantly greater than those of the 180° step (P < 0.05).

Conclusion: There are significant differences in the biomechanical results between different angles strides, and the 45° stride affects the knee joint load more, and potentially produces greater tension on the ACL, resulting in an increased risk of knee joint injury, suggesting that athletes have higher requirements for lower limb strength when performing 45° strides.

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