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Postural control strategies in individuals with and without chronic ankle instability during the reach phase of the posteromedial direction of the star excursion balance test
Journal article   Open access   Peer reviewed

Postural control strategies in individuals with and without chronic ankle instability during the reach phase of the posteromedial direction of the star excursion balance test

Shojiro Nozu, Kristin A. Johnson, Tadamitsu Matsuda and Yuji Takazawa
Physical therapy in sport, Vol.72, pp.18-24
03/2025
DOI: 10.1016/j.ptsp.2024.12.008
PMID: 39778474
url
https://doi.org/10.1016/j.ptsp.2024.12.008View
Published (Version of record) Open Access

Abstract

To compare center of mass (COM) and center of pressure (COP) displacement, joint angles, and muscle activity for the ankle, knee, and hip during the posteromedial (PM) reach direction of the Star Excursion Balance Test between individuals with chronic ankle instability (CAI) and healthy individuals. Cross-sectional Study. Biomechanics laboratory. Fifteen individuals with CAI (age: 20.0 ± 1.2 y) and 20 healthy individuals (age: 20.6 ± 0.8 y). The maximum reach distance (MRD). The COM and COP displacement, and ankle, knee, and hip joint angles of the stance limb during the PM reach task measured via a 3D motion analysis system. Electromyography (EMG) was also recorded during the task from the tibialis anterior (TA), soleus, peroneus longus, vastus medialis (VM), biceps femoris, and gluteus medius muscles. MRD of the CAI group was shorter than the healthy group (P = 0.005). The CAI group showed higher COM positioning (P = 0.007), less knee flexion (P = 0.009), and lower muscle activity in TA (P = 0.04), and VM (P = 0.007) during performance of the PM reach as compared to the healthy group. These findings suggest that individuals with CAI demonstrate altered postural control strategies during PM reach performance, likely contributing to a shorter MRD. •People with CAI altered their knee joint angle, COM positioning, and muscle activity in TA and VM throughout the posteromedial reach of the SEBT compared to a healthy population.•These altered postural control strategies likely contributed to the decreased posteromedial reach distance.•Identifying distinct movement strategies between stable and unstable ankle conditions during dynamic postural control tasks may improve clinical assessment and intervention for CAI.
 Ankle instability Ankle sprain Balance Motor control

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