The Victorian Institute of Sport Assessment – Achilles is fundamentally flawed and unfit for clinical practice or research: A Rasch Measurement Theory Analysis using COSMIN recommendations

IF 2.2 3区医学 Q1 REHABILITATION Physical Therapy in Sport Pub Date : 2025-03-04 DOI:10.1016/j.ptsp.2025.03.002

Nigel Travers , Myles C. Murphy , Benedict M. Wand , Paul Kirwan , Mervyn Travers , James Debenham , William Gibson , Dana Hince

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Abstract

Objectives

Evaluate structural validity, hypothesis testing and measurement invariance of the Victorian Institute of Sport Assessment–Achilles (VISA-A) using Rasch analysis to determine if it can be recommended to measure Achilles tendinopathy severity.

Methods

We performed an evaluation of the VISA-A measurement properties using Rasch Measurement Theory by pooling individual participant data from previously conducted studies (n = 217). Structural validity was assessed via threshold/category mean order; adequate item fit; unidimensionality; local dependence; internal consistency. Hypothesis testing was assessed via divergent validity. Measurement invariance assessed via differential item functioning.

Results

The VISA-A has inadequate construct validity. This is evident from issues with item 8 and insufficient threshold order, item fit, borderline internal consistency and measurement invariance, with item response being influenced by both age and BMI.

Conclusion

The VISA-A has inadequate structural validity, borderline internal consistency and poor measurement invariance. Thus, the VISA-A does not meet with COSMIN criteria for construct validity due to issues with structural validity and measurement invariance. Thus, the VISA-A cannot be recommended for use, and should not be used in clinical practice or research. However, if the VISA-A has been used, analysis using only items 1–6, with responses collapsed into a 4-point scale provides the best structural validity.

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来源期刊

Physical Therapy in Sport 医学-康复医学

CiteScore

4.50

自引率

8.30%

发文量

125

审稿时长

39 days

期刊介绍： Physical Therapy in Sport is an international peer-reviewed journal that provides a forum for the publication of research and clinical practice material relevant to the healthcare professions involved in sports and exercise medicine, and rehabilitation. The journal publishes material that is indispensable for day-to-day practice and continuing professional development. Physical Therapy in Sport covers topics dealing with the diagnosis, treatment, and prevention of injuries, as well as more general areas of sports and exercise medicine and related sports science. The journal publishes original research, case studies, reviews, masterclasses, papers on clinical approaches, and book reviews, as well as occasional reports from conferences. Papers are double-blind peer-reviewed by our international advisory board and other international experts, and submissions from a broad range of disciplines are actively encouraged.