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Chronic Ankle Instability (CAI)

No clear winner yet – the multifactorial nature of CAI makes things difficult.

Eechaute, et al (2007) - These are valid for use in CAI:
Functional Ankle Ability Index
Foot & Ankle Disability Index (FADI) used alot in the research

Foot & Ankle Outcome Scale (FAOS) has less content validity for CAI

Donahue, et al (2011)
No single measure was able to predict if individuals met the minimally accepted criteria for FAI.

However, a significantly accurate prediction of ankle stability status was produced by combining the Cumberland Ankle Instability Tool  (CAIT) and (Ankle Instability Instrument (AII).