Biomechanics of lower extremities from straight forward to side-step cutting
10.3969/j.issn.2095-4344.2473
- Author:
Shanghua LI
1
Author Information
1. Tianjin University of Sports
- Publication Type:Journal Article
- Keywords:
Anterior cruciate ligament;
Biomechanics;
Dynamics;
Inward rotation;
Kinematics;
Lateral stride;
Straight forward;
Torque;
Valgus
- From:
Chinese Journal of Tissue Engineering Research
2020;24(8):1260-1266
- CountryChina
- Language:Chinese
-
Abstract:
BACKGROUND: Side-step cutting is the most common offensive technique in the field of sports that greatly increases the risk of knee injury. However, the biomechanical performance strategies and the characteristics of lower limb joint load during the side-step cutting are not very clear. OBJECTIVE: To carry out the biomechanics test of the side-step cutting in lower limb movement strategy among college female basketball and football players, and to analyze the kinematics and dynamics parameters of the lower limbs, providing an important reference for athletes and trainers to prevent lower limb injuries, especially cruciate ligament injury. METHODS: Twelve female football and basketball players coming from a university were selected as the experimental subjects. The kinematics and dynamics parameters of the side-step cutting were acquired synchronously by using the three-dimensional dynamometer and the motion image shooting system. The relevant data were processed and analyzed by SPSS 21.0 software. The study protocol was approved by Tianjin University of Sports in China. RESULTS AND CONCLUSION: (1) Football players had greater ankle metatarsal flexion angle and hip abduction angle, maximum ankle valgus angle, knee flexion and rotation angle with knee flexion and rotation angle changes. (2) Football players had greater peak ankle rotation and hip adduction moment, while basketball players had larger plantar flexion moment. (3) Basketball players have smaller first and second peak values of forward and backward partial braking force, the first peak value of vertical partial braking force and larger peak value of forward and backward partial pushing force. In the process of side-step cutting, football players are accustomed to stop in a sudden way with their forefeet touching, thus producing higher ground reaction force and increasing knee flexion angle to buffer, while having greater ankle valgus angle and knee rotation angle. Basketball players have smaller knee flexion angle in the process of side-step cutting. A smaller angle is not conducive to the lower limb joint to buffer the ground reaction force, and then increases the risk of anterior cruciate ligament injury.
