Martin Caroline, Sorel Anthony, Touzard Pierre, Bideau Benoit, Gaborit Ronan, DeGroot Hugo, Kulpa Richard
M2S Laboratory, Rennes 2 University, Rennes, France.
J Sports Sci. 2021 May;39(9):992-1000. doi: 10.1080/02640414.2020.1853335. Epub 2020 Dec 6.
The open stance forehand has been hypothesized to be more traumatic for knee injuries in tennis than the neutral stance forehand. This study aims to compare kinematics and kinetics at the knee during three common forehand stroke stances (attacking neutral stance ANS, attacking open stance AOS, defensive open stance DOS) to determine if the open stance forehand induces higher knee loadings and to discuss its potential relationship with given injuries. Eight advanced tennis players performed eight repetitions of forehand strokes with each stance (ANS: forward run and stroke with feet parallel with the hitting direction, AOS: forward run and stroke with feet perpendicular to the hitting direction, DOS: lateral run and stroke with feet perpendicular to the hitting direction) at maximal effort. All the trials were recorded with an optoelectronic motion capture system. The flexion-extension, abduction-adduction, external-internal rotation angles, intersegmental forces and torques of the right knee were calculated. Ground reaction forces were measured with a forceplate. The DOS increases vertical GRF, maximum knee flexion and abduction angles, range of knee flexion-extension, peak of compressive, distractive and medial knee forces, peak of knee abduction and external rotation torques. Consequently, the DOS appears potentially more at risk for given knee injuries.
开放式站位正手击球被认为在网球运动中比中性站位正手击球对膝盖损伤更具创伤性。本研究旨在比较三种常见正手击球站位（攻击性中性站位ANS、攻击性开放式站位AOS、防御性开放式站位DOS）时膝盖的运动学和动力学，以确定开放式站位正手击球是否会导致更高的膝盖负荷，并探讨其与特定损伤的潜在关系。八名高级网球运动员以最大努力对每种站位（ANS：向前奔跑并击球，双脚与击球方向平行；AOS：向前奔跑并击球，双脚垂直于击球方向；DOS：侧向奔跑并击球，双脚垂直于击球方向）进行八次正手击球重复动作。所有试验均采用光电运动捕捉系统进行记录。计算右膝的屈伸、外展内收、内外旋转角度、节段间力和扭矩。使用测力台测量地面反作用力。防御性开放式站位会增加垂直地面反作用力、最大膝盖屈曲和外展角度、膝盖屈伸范围、膝盖压缩、拉伸和内侧力峰值、膝盖外展和外旋扭矩峰值。因此，防御性开放式站位在特定膝盖损伤方面似乎潜在风险更高。
