Abstract

Aim. To explore whether the eccentric muscle strength of both hip abductors and external rotators differ in participants with subacute lateral ankle sprain and healthy population, and to compare the Biodex balance measures as well. Material and methods. Thirty males diagnosed as a second degree ankle sprain enrolled in this study, while twenty-nine healthy volunteers considered as controls. The study measured both the peak eccentric torque for both hip abductors and external rotators using Biodex isokinetic dynamometer. All participants examined for bilateral and unilateral balance ability using Biodex balance system from erect position to determine total stability index (SI), anteroposterior index (API), and mediolateral index (MLI). Results. A detected significant negative correlation was obvious between peak eccentric isokinetic testing for hip external rotators torque; and total SI, API, and MLI of all the Biodex balance system measures for bilateral stance and API in unilateral stance. While, a moderate significant positive correlation found for peak eccentric isokinetic torques between both hip external rotators and abductors. Conclusion. Decreased hip muscle strength can increase the vulnerability of ankle ligaments via minimizing the postural control during weight-bearing activities, which, in turn, stimulates the compensatory neuromuscular mechanisms.

Key words:

Biodex Balance System, Peak Isokinetic Torque, Sub-Acute Ankle Sprain, Hip Muscle Weakness and Balance Stability Index