Validity of the Foot and Ankle Ability Measure in Athletes With Chronic Ankle Instability

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Abstract
Context: The Foot and Ankle Ability Measure (FAAM) is a region-specific, non–disease-specific outcome instrument that possesses many of the clinimetric qualities recommended for an outcome instrument. Evidence of validity to support the use of the FAAM is available in individuals with a wide array of ankle and foot disorders. However, additional evidence to support the use of the FAAM for those with chronic ankle instability (CAI) is needed. Objective: To provide evidence of construct validity for the FAAM based on hypothesis testing in athletes with CAI. Design: Between-groups comparison. Setting: Athletic training room. Patients or Other Participants: Thirty National Collegiate Athletic Association Division II athletes (16 men, 14 women) from one university. Main Outcome Measure(s): The FAAM including activities of daily living (ADL) and sports subscales and the global and categorical ratings of function. Results: For both the ADL and sports subscales, FAAM scores were greater in healthy participants (100 ± 0.0 and 99 ± 3.5, respectively) than in subjects with CAI (88 ± 7.7 and 76 ± 12.7, respectively; P < .001). Similarly, for both ADL and sports subscales, FAAM scores were greater in athletes who indicated that their ankles were normal (98 ± 6.3 and 96 ± 6.9, respectively) than in those who classified their ankles as either nearly normal or abnormal (87 ± 6.6 and 71 ± 11.1, respectively; P < .001). We found relationships between FAAM scores and self-reported global ratings of function for both ADL and sports subscales. Relationships were stronger when all athletes, rather than just those with CAI, were included in the analyses. Conclusions: The FAAM may be used to detect self-reported functional deficits related to CAI.

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