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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Context:

Measurement reliability is critical when new sports-medicine devices or techniques are developed.

Objective:

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

Design:

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.

Setting:

Sports-medicine research laboratory.

Participants:

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

Measurements:

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.

Results:

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.

Conclusions:

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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