Highlights Techniques such as 3D stress-MRI of the ankle can quantify the mechanical instability that leads to chronic ankle instability. The study primarily evaluated the effect of a semirigid ankle brace on joint congruency in a plantarflexion/supination position with and without load. Introduction Chronic ankle instability (CAI) is caused by the interaction of two ankle instability etiologies: functional (FAI) and mechanical (MAI) . Recurrent sprains are a common symptom of these insufficiencies, which can cause a sense of instability.

In athletic populations, an ankle brace or tape is commonly used to reduce the recurrence rate or severity of sprains. Rationale In practice, however, diagnosing an unstable ankle remains challenging and has limitations, particularly while quantifying mechanical instability. This methodology enables the study of joint congruency with and without axial…