Get the Essential Data You Need to Assess Chronic Ankle Instability (CAI)

Athlete performing a simple CAI assessment on the MobileMat.Athlete performing a simple CAI assessment on the MobileMat.

Twenty-five percent of all sports injuries are ankle sprains, which if left untreated or if improperly diagnosed, can result in lingering symptoms and decreased athletic performance.

McKeon and Hertel state, 'criticism of the traditional measures is that they may lack the sensitivity to detect postural control differences associated with CAI.'1

How can you objectively assess lower limb instabilities?

Time-to-Boundary has proven to be a useful tool for the assessment of chronic ankle instability. According to Hertel and Olmsted-Kramer, 'time-to-boundary measures appear to detect postural control deficits related to chronic ankle instability that most of the traditional COP-based measures fail to.'2  

New Whitepaper about the Objective Assessment of Chronic Ankle Instability

This white paper discusses the Time-to-Boundary measurement and how it can be used for ojective CAI assessments.


  • Explore the differences between TTB and Limits of Stability (LOS)
  • See clinical applications of TTB to measure and evaluate CAI
  • Examine research studies on TTB
  • Learn about a new, mobile system for objective CAI assessments

1. McKeon, Patrick and Jay Hertel. 2008. “Spatiotemporal Postural Control Deficits are Present in Those with Chronic Ankle Instability.’ BMC Musculoskeletal Disorders 9:76.
2. Hertel, Jay and Lauren C. Olmsted-Kramer. 2007. "Deficits in Time-to-Boundary Measures of Postural Control with Chronic Ankle Instability.' Gait & Posture 25, 33-39.