Reliability of Intratester and Intertester Measurements Derived from an Instrumented Ankle Arthrometer

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Tricia J. Hubbard
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John E. Kovaleski
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Thomas W. Kaminski
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Measurement reliability is critical when new sports-medicine devices or techniques are developed.


To determine the reliability of laxity measurements obtained from an instrumented ankle arthrometer.


Intratester reliability was examined using a test–retest design, and intertester reliability was assessed using the measurements recorded by 2 different examiners on a separate group of participants.


Sports-medicine research laboratory.


40 participants with no history of ankle injury, equally divided across the 2 studies.


Laxity measurements included anteroposterior (AP) displacement during loading to 125 N. Inversion–eversion (I–E) rotation was tested during loading to 4000 N-mm. The measures were analyzed using intraclass correlation coefficients (ICCs) and dependent t tests.


Good to excellent ICCs (.80–.99) for intratester and intertester reliability. A significant difference in measures was observed between testers for both AP displacement and I–E rotation.


Laxity measurements from an instrumented ankle arthrometer are reliable across test days and examiners

Hubbard is a doctoral student in the Dept of Kinesiology, Pennsylvania State University, University Park, PA 16802-5702. Kovaleski is with the Dept of Health and Physical Education and Dept of Orthopaedic Surgery, University of South Alabama, Mobile, AL 36688. Kaminski is with the Dept of Health, Nutrition & Exercise Science, University of Delaware, Newark, DE, 19716.

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