Compensatory Kinetics During the Side-Hop Test in Individuals With Chronic Ankle Instability

Author:

Ono Kyoya1,Yoshida Takuya2,Ota Kazuki1,Tanigawa Satoru3

Affiliation:

1. *Graduate School of Comprehensive Human Sciences, University of Tsukuba, Ibaraki, Japan

2. †Japan Institute of Sports Sciences, Nishigaoka, Kita-ku, Tokyo

3. ‡Faculty of Health and Sport Science, University of Tsukuba, Ibaraki, Japan

Abstract

Context Individuals with chronic ankle instability (CAI) exhibit altered movement strategies during side-cutting tasks. However, no researchers have assessed how altered movement strategies affect cutting performance. Objective To investigate compensatory strategies in the side-hop test (SHT), with a focus on the entire lower extremity, among individuals with CAI. Design Cross-sectional study. Setting Laboratory. Patients or Other Participants A total of 40 male soccer players comprising a CAI group (n = 20; age = 20.35 ± 1.15 years, height = 173.95 ± 6.07 cm, mass = 68.09 ± 6.73 kg) and a control group (n = 20; age = 20.45 ± 1.50 years, height = 172.39 ± 4.39 cm, mass = 67.16 ± 4.87 kg). Intervention(s) Participants performed 3 successful SHT trials. Main Outcome Measure(s) We calculated SHT time, torque, and torque power in the ankle, knee, and hip joints during the SHT using motion-capture cameras and force plates. Confidence intervals for each group that did not overlap by >3 points consecutively in the time series data indicated a difference between groups. Results Compared with the control group, the CAI group showed (1) no delayed SHT time; (2) lower ankle-inversion torque (range = 0.11–0.13 N·m/kg) and higher hip-extension (range = 0.18–0.72 N·m/kg) and -abduction torque (0.26 N·m/kg); (3) less concentric power in ankle dorsiflexion-plantar flexion (0.18 W/kg) and inversion-eversion (0.40 W/kg), more concentric power in hip flexion-extension (0.73 W/kg), and more eccentric power in knee varus-valgus (0.27 W/kg). Conclusions Individuals with CAI were likely to rely on hip-joint function to compensate for ankle instability and demonstrated no differences in SHT time compared with the control group. Therefore, the movement strategies of individuals with CAI could differ from those of individuals without CAI, even if SHT time is not different.

Publisher

Journal of Athletic Training/NATA

Subject

Physical Therapy, Sports Therapy and Rehabilitation,Orthopedics and Sports Medicine,General Medicine

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4. Selection criteria for patients with chronic ankle instability in controlled research: a position statement of the International Ankle Consortium;Gribble;J Athl Train,2014

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