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Sixteen of the eighteen Ankle Osteoarthritis Scale items have psychometric properties beneficial for baseline clinical assessment of patients with end-stage ankle arthritis.
Ankle Osteoarthritis Scale emerges as a significant and robust instrument to estimate the impact of pain and dysfunction within people with end-stage ankle arthritis, even after excluding items 7 and 8. This analysis was intended to validate the function of Ankle Osteoarthritis Scale instrument, a prospective comparative study based on a secondary analysis of patients registered for total ankle replacement or ankle arthrodesis in Vancouver, Canada. A total of 88 participants completed the study. Between September 2014 and August 2017, the participants completed the instrument. Controlling for analysis participants underlying level of ankle function, item difficulty and discrimination parameters were estimated using the item response theory. The differential item function was observed for age, sex and operation.
According to the modification
indices, item 10, "walking around the house," would better suit the
pain domain as compared to the disability domain. A range of discrimination and
difficulty was found in the items of pain domain, whereas, items of disability
domain showed a range of discrimination with low difficulty. Differential item
functioning for age, sex and total ankle replacement or ankle arthrodesis
seemed to be ignorable. Overall outcomes illustrate that the Ankle
Osteoarthritis Scale appears like an excellent diagnostic tool for end-stage
ankle arthritis.
Foot & Ankle International
Validation of the Ankle Osteoarthritis Scale Instrument for Preoperative Evaluation of End-Stage Ankle Arthritis Patients Using Item Response Theory.
Guiping Liu et al.
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