Perceived Instability, Pain, and Psychological Factors for Prediction of Function and Disability in Individuals With Chronic Ankle Instability.

contextChronic ankle instability (CAI) is associated with residual instability, pain, decreased function, and increased disablement. Injury-related fear has been associated with CAI, although its relationship to other impairments is unclear. The fear-avoidance model is a theoretical framework hypothesizing a relationship among pain catastrophizing, injury-related fear, chronic pain, and disability. It has been useful in understanding fear's influence in other musculoskeletal conditions but has yet to be studied in those with CAI.

objectiveTo explore relationships among instability, pain catastrophizing, injury-related fear, pain, ankle function, and global disability in individuals with CAI.

designCross-sectional study.

settingAnonymous online survey. PATIENTS OR OTHER

participantsA total of 259 people, recruited via email and social media, with a history of ankle sprain completed the survey; of those, 126 participants (age = 32.69 ± 4.38 years, females = 84.92%, highly active = 73.81%) were identified as having CAI and were included in the analysis. MAIN OUTCOME MEASURE(S): Demographics of gender identity, age, and physical activity level were recorded. Assessments used were the Identification of Functional Ankle Instability questionnaire (instability), the Pain Catastrophizing Scale (pain catastrophizing), the Tampa Scale of Kinesiophobia-11 (injury-related fear), a numeric pain rating scale and activity-based question (pain presence), the Quick Foot and Ankle Ability Measure (ankle function), and the modified Disablement in the Physically Active Scale (disability). Relationships among variables were explored through correlation and regression analyses.

resultsAfter we controlled for instability and pain, pain catastrophizing and injury-related fear were significantly related to function and disability ratings in individuals with CAI. Together, the variables predicted 48.7% (P < .001) of the variance in function and 44.2% (P < .001) of the variance in disability.

conclusionsGreater instability, pain catastrophizing, injury-related fear, and pain predicted decreased function and greater disability in those with CAI. These findings are consistent with the hypothesized relationships in the fear-avoidance model, although further investigation is needed to determine causality of these factors in the development of CAI.