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. 2022 Jul 25;10(7):23259671221107343.
doi: 10.1177/23259671221107343. eCollection 2022 Jul.

Dynamic Postural Stability Is Decreased During the Single-Leg Drop Landing Task in Male Collegiate Soccer Players With Chronic Ankle Instability

Kohei Kawaguchi  1   2 , Shuji Taketomi  1   2 , Yuri Mizutani  1 , Hiroshi Inui  2 , Ryota Yamagami  2 , Kenichi Kono  2 , Tomofumi Kage  2 , Seira Takei  2 , Sayaka Fujiwara  3 , Toru Ogata  3 , Sakae Tanaka  2
Affiliations

Dynamic Postural Stability Is Decreased During the Single-Leg Drop Landing Task in Male Collegiate Soccer Players With Chronic Ankle Instability

Kohei Kawaguchi et al. Orthop J Sports Med. .

Abstract

Background: Chronic ankle instability (CAI) is commonly encountered in soccer players. The feelings of instability and anxiety caused by CAI can lead to poor performance, such as difficulty in sharp change of direction during soccer play. The single-leg drop landing (SLDL) task is often used to evaluate dynamic postural stability.

Purpose/hypothesis: The purpose of this study was to clarify whether dynamic stability measured during SLDL is altered in male collegiate soccer players with CAI. The hypothesis was that athletes with CAI would show poor dynamic postural stability.

Study design: Controlled laboratory study.

Methods: A total of 103 male collegiate soccer players were recruited, and their limbs were classified based on the new international CAI criteria. All players performed three 5-second SLDL trials on a force plate. The main outcome measures included time to stabilization of the horizontal ground-reaction force (GRF); peak GRF in the vertical, horizontal, and sagittal directions; and trajectory length of the center of pressure during SLDL.

Results: Data from 59 CAI limbs and 147 non-CAI limbs were collected in this study. Time to stabilization of horizontal GRF was significantly longer in the CAI limbs (P < .001), and the peak GRFs in all directions were significantly lower in the CAI limbs (vertical, P < .001; horizontal, P < .001; sagittal, P = .001). Additionally, the trajectory length of the center of pressure was significantly greater in the CAI limbs (P = .004).

Conclusion: Soccer players with CAI had decreased dynamic postural stability that led them to land softly when performing the SLDL task. Measurement of dynamic postural stability may be useful in the evaluation of CAI.

Clinical relevance: Our findings may be useful for strategies of daily training or as an evaluation tool.

Keywords: chronic ankle instability; dynamic postural stability; force plate; single-leg drop landing; soccer.

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Conflict of interest statement

One or more of the authors has declared the following potential conflict of interest or source of funding: Funding was provided in the form of scholarships from the East Japan Railway Company and Shimamura-Syoukai, as well as grants from the Nakatomi Foundation; the Japanese Orthopaedic Society of Knee, Arthroscopy and Sports Medicine; the Japanese Sports Medicine Foundation; the Japan Sport Council; the Watanabe Memorial Foundation for the Advancement of Technology; and the Japan Orthopaedics Traumatology Foundation. AOSSM checks author disclosures against the Open Payments Database (OPD). AOSSM has not conducted an independent investigation on the OPD and disclaims any liability or responsibility relating thereto.

Figures

Figure 1.
Figure 1.
Single-leg drop landing test. (A) The start position on the 30-cm box. (B) The single-leg landing on the force plate.
Figure 2.
Figure 2.
Definition of the ground-reaction forces (GRFs). The vertical GRF was defined as a vector perpendicular to the force plate in the total GRF. The horizontal GRF was defined as a mediolateral vector in the GRF, and the sagittal GRF was defined as an anteroposterior vector in the GRF.
See this image and copyright information in PMC

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