An inverted ankle joint orientation at foot strike could incite ankle inversion sprain: Comparison between injury and non-injured cutting motions of a tennis player

Mok, Kam-Ming; Ha, Sophia Chui-Wai; Chan, Zoe Y. S.; Yung, Patrick Shu‐Hang; Fong, Daniel Tik-Pui

doi:10.1016/j.foot.2021.101853

Cited by 7 publications

(5 citation statements)

References 31 publications

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“…This means that the tennis volley level of P1 is the highest and that of P6 is the lowest, which provides a reference for subsequent comparison. In all areas of A, B, or C, the left ankle angles of all subjects are greater than the angles of the right ankle, which has nothing to do with the technical level and height of the subjects but is consistent with the gravity center of the right foot during volley preparation [23][24]. The left ankle angle of the subject is significantly greater than that of the subject (P < 0.05).…”

Section: B Discussion On the Experimental Results Of Volley Shooting ...mentioning

confidence: 65%

The Biomechanical Analysis on the Tennis Batting Angle Selection Under Deep Learning

Li,

Zhang,

Yang

2023

IEEE Access

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The objective is to study the impacts of batting strength and angle of tennis players on batting results based on deep learning (DL) image processing technology. A real-time evaluation algorithm of human motion is constructed based on the camera video image and convolution neural network (CNN), and the selection of joint angles in volley training of tennis players is analyzed from the perspective of biomechanics. Gaussian Mixture Model (GMM), Visual Background Extractor (VIBE), and Optical Flow (OF) are introduced for simulation and comparison. Then, the proposed algorithm is applied to the volley experiments in areas A, B, and C of 6 tennis players (denoted by P1, P2, P3, P4, P5, and P6). The results show that the processing frame rate and batting and follow-up similarity score of the proposed algorithm based on the camera video image and CNN are significantly higher than those of GMM, VIBE, and OF. The return success rates of P1 in different areas are the highest, which are 75.46%, 75.62%, and 68.94%, respectively; while those of P6 are the lowest (19.55%, 17.46%, and 21.65%, respectively). The left ankle angle of P6 is much greater than that of P1, the angle of P1 is significantly lower than that of P3, P4, P5, and P6. The batting speed of P1 is significantly slower than that of P3, P4, P5, and P6, which is not much different from that of the left knee joint. The angles of the subjects' right forearm ring, left lower leg ring, and left thigh ring is obvious. Additionally, the displacement of the left foot of P1 and P6 in area A is 0.916m and 0.548m, respectively. Therefore, in the volley preparation stage, the left ankle angle (103-108°) is greater than that of the right ankle (98-103°); the tennis batting speed should be basically the same as that of the left knee joint to lower the gravity center of player. Thus, the proposed algorithm outperforms other algorithms in the volley experiment of tennis players.INDEX TERMS Convolutional neural networks; monocular camera video image; real-time evaluation algorithm of human motion; volley experiment of tennis; biomechanics

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Section: B Discussion On the Experimental Results Of Volley Shooting ...mentioning

confidence: 65%

The Biomechanical Analysis on the Tennis Batting Angle Selection Under Deep Learning

Li,

Zhang,

Yang

2023

IEEE Access

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“…An ankle inversion angle of 14° at foot strike has been reported to incite an event of ankle inversion sprain due to medially deviated ground reaction force and subsequently an inversion moment arm along the ankle joint center. 6,8 The results of this study indicated that without anticipation, individuals with CAI presented greater ankle inversion angle pre-and post-landing, which, given that participants were able to undertake some practice jumps and were landing on a flat, non-slip solid surface, may increase the risks of lateral ankle sprain during unplanned landings in sporting contexts. Additionally, relative to the control group, the CAI group adopted a less plantarflexed position between pre-landing from 185 ms till post-landing 25 ms.…”

Section: Discussionmentioning

confidence: 87%

“…Increased inversion angle 6 and decreased activation of peroneal muscle 7 during initial contact are two identified impairments contributing to lateral ankle sprain during landing. The typical sequence of inversion ankle sprain 8 is: 1) That an inverted ankle landing position generates twisting torque around the ankle joint, 2) coupled with reduced peroneal muscle activity so leads to overstretching and sprain of the ankle lateral ligaments. Previous studies showed that individuals with CAI exhibited greater ankle‐inversion angles, 6 as well as less peroneus longus muscle activity 9 than healthy individuals, which may be associated with recurrent lateral ankle sprains during landings.…”

Section: Introductionmentioning

confidence: 99%

Anticipation of landing leg masks ankle inversion orientation deficits and peroneal insufficiency during jump landing in people with chronic ankle instability

Hou,

Shen,

Fong

et al. 2024

Scandinavian Med Sci Sports

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Ankle inversion orientation and peroneal activation insufficiency may contribute to lateral ankle sprains during landing in chronic ankle instability (CAI); however, how anticipation alters these factors is neglected. This study aimed to assess the impact of anticipation on joint orientation and muscle activity during landing in individuals with CAI. Fifteen participants with CAI and 15 healthy participants (control) were recruited to perform single‐leg landings after bilateral countermovement jumps when the landing limb was specified before (planned) or after (unplanned) take‐off. Joint angle (hip, knee, and ankle) and electromyography (gluteus medius, rectus femoris, biceps femoris, gastrocnemius lateral head, tibialis anterior, and peroneal longus) were collected and analyzed with 2 (groups) × 2 (conditions) statistical parametric mapping ANOVA. In the unplanned condition, the CAI group demonstrated a less plantarflexed (maximum difference [MD] = 9.5°, p = 0.047) and more inverted ankle joint (MD = 4.1°, p < 0.001) before ground contact, along with lower peroneal activity at ground contact compared to the control group (MD = 28.9% of peak activation, p < 0.001). No significant differences between groups were observed in the planned condition. In conclusion, anticipation may mask jump landing deficits in people with CAI, including inverted ankle orientation and reduced peroneus longus activity pre‐ and post‐landing, which were observed exclusively in unplanned landings. Clinicians and researchers need to recognize the impact of anticipation on apparent landing deficits and consider the implications for injury prevention and rehabilitation strategies.

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“…However, even though from a biomechanical standpoint the ankle is more vulnerable in a plantarflexed position, LAS are not always sustained in that position. 24,28 LAS can be sustained with the ankle in an inverted, internally rotated and dorsiflexed or plantarflexed position. 24,28 Further large-scale studies determining the prevalence of each mechanism of injuries are needed.…”

Section: Discussionmentioning

confidence: 99%

“…24,28 LAS can be sustained with the ankle in an inverted, internally rotated and dorsiflexed or plantarflexed position. 24,28 Further large-scale studies determining the prevalence of each mechanism of injuries are needed.…”

Section: Discussionmentioning

confidence: 99%

Lower Limb Biomechanics During Drop-Jump Landings on Challenging Surfaces in Individuals With Chronic Ankle Instability

Moisan

Mainville

Descarreaux

et al. 2022

Journal of Athletic Training

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Context: Individuals with chronic ankle instability (CAI) exhibit impaired lower limb biomechanics during unilateral drop jump landing on a flat surface. However, lower limb biomechanical adaptations during unilateral drop jump landing on more challenging surfaces such as unstable or inclined are yet to be described. Objective: Determine how unilateral drop jump landing surfaces (flat, unstable and inclined) influence lower limb EMG, kinematics and kinetics in individuals with CAI. Design: Descriptive laboratory study. Setting: Biomechanics laboratory. Patients or Other Participants: Twenty-two young adults with CAI Interventions: Participants completed five trials of unilateral drop jump landing from a 46 cm height platform on flat (DROP), unstable (FOAM) and laterally inclined (WEDGE) surfaces. Main outcome measure(s): EMG of gluteus medius, vastus lateralis, gastrocnemius medialis, peroneus longus and tibialis anterior muscles were recorded. Knee and ankle angles and moments were calculated using a three-dimensional motion analysis system and a force plate. Biomechanical variables were compared between tasks using one-dimensional statistical nonparametric mapping. Results: During DROP, greater ankle dorsiflexion angles, knee extension moments and vastus lateralis muscle activity (FOAM only) were observed compared to FOAM and WEDGE. Greater ankle inversion angles were observed during FOAM and WEDGE compared to DROP. Peroneus longus muscle activity was greater during DROP compared to FOAM. During FOAM, greater ankle inversion and knee extension angles, ankle inversion and internal rotation moments as well as smaller peroneus longus muscle activity were observed compared to WEDGE. Conclusions: The greater ankle inversion and plantarflexion angles as well as the lack of increase in peroneus longus muscle activation during FOAM and WEDGE could increase the risk of recurrent LAS in individuals with CAI. The results of this study improve our understanding of lower limb biomechanics changes when landing on more challenging surfaces and will help clinicians better targeting deficits associated with CAI during rehabilitation.

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An inverted ankle joint orientation at foot strike could incite ankle inversion sprain: Comparison between injury and non-injured cutting motions of a tennis player

Cited by 7 publications

References 31 publications

The Biomechanical Analysis on the Tennis Batting Angle Selection Under Deep Learning

The Biomechanical Analysis on the Tennis Batting Angle Selection Under Deep Learning

Anticipation of landing leg masks ankle inversion orientation deficits and peroneal insufficiency during jump landing in people with chronic ankle instability

Lower Limb Biomechanics During Drop-Jump Landings on Challenging Surfaces in Individuals With Chronic Ankle Instability

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