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Ankle Joint

Ankle Joint

The ankle is formed by the talocrural joint (crural = leg). It consists of the articulations between the talus bone of the foot and the distal ends of the tibia and fibula of the leg. The superior aspect of the talus bone is square-shaped and has three areas of articulation. The top of the talus articulates with the inferior tibia. This is the portion of the ankle joint that carries the body weight between the leg and foot. The sides of the talus are firmly held in position by the articulations...

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Isokinetic eccentric vs. concentric training for functional ankle instability: a randomized controlled trial.

Dunbing Huang¹, Wei Song², Yang Liu³

¹Encephalopathy and Rehabilitation Center, The Second Affiliated Hospital of Zhejiang Chinese Medical University, No. 318 Chaowang Road, Hangzhou, Zhejiang, 310005, China.

Journal of Orthopaedic Surgery and Research

|August 20, 2025

Summary

Isokinetic eccentric training significantly improved postural control and ankle strength in individuals with functional ankle instability (FAI). This rehabilitation strategy enhances neuromuscular function and reduces reinjury risk.

Keywords:

Dorsiflexion Eversion Functional ankle instability Isokinetic eccentric training Isokinetic muscle strength Postural control

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Area of Science:

Sports Medicine
Rehabilitation Science
Biomechanics

Background:

Functional ankle instability (FAI) is characterized by recurrent ankle sprains and impaired proprioception.
Limited research exists on the efficacy of specific isokinetic training modalities for FAI.

Purpose of the Study:

To evaluate the impact of a 12-week isokinetic eccentric training program on postural control and ankle muscle strength in individuals with FAI.

Main Methods:

A randomized controlled trial involving 42 participants with unilateral FAI.
Participants were assigned to either isokinetic eccentric or concentric training groups (n=20 per group post-dropout).
Postural control and ankle strength (including torque ratios) were assessed pre- and post-intervention.

Main Results:

The eccentric training group showed significant improvements in static and dynamic postural control compared to the concentric group.
Marked increases in ankle dorsiflexion and eversion strength were observed in the eccentric group.
Significant improvements in dorsiflexion/plantarflexion and eversion/inversion torque ratios were noted with large effect sizes.

Conclusions:

Isokinetic eccentric training is an effective intervention for enhancing postural stability and ankle muscle strength in FAI patients.
Eccentric training improves torque symmetry and balance, supporting its use in rehabilitation to minimize reinjury risk.