Oral Communication

Functional ankle instability assessment

Dr Nicolas FORESTIERa, Dr Romain TERRIERa

a Laboratoire de Physiologie de l'Exercice (EA 4338) - Université de Savoie

Capsulo-ligamentous damages caused by traumatic inversion during lateral ankle sprains frequently cause Chronic ankle Instability (CAI). CAI is the consequence of passive (mechanical origin) and/or active (functional origin) articular stabilization mechanisms.

The detection of patients affected by functional CAI, with objective parameters, is crucial for rehabilitation specialists and physical trainers. Orthostatic performance analysis if often used to this end. However, classical surface and velocity CoP values are not adapted and a specific parameter, the Time-To-Bundary has been proposed (1,2). Moreover, even if isokinetic tests are considered as the “gold standard” methodology to assess ankle evertors deficit, there is no clear consensus about a relation between torque performances and CAI. It’s also important to keep in mind that such measure and analysis methodologies are unsuitable in a field environment and thus underused by rehabilitation specialists and physical trainers.

The aim of this presentation is to propose alternative and original tests, easy to use in daily practice and able to assess sensorimotor alterations and muscular impairments typically associated with functional CAI.


  1. Hertel J, Olmsted-Kramer LC. Deficits in time-to-boundary measures of postural control with chronic ankle instability. Gait & Posture 2007;25:33-39.
  2. McKeon P, Hertel J. Spatiotemporal postural control deficits are present in those with chronic ankle instability. BMC Musculoskelet Disord 2008;9:76.

Keywords : ankle sprain - instability