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First published on August 16, 2004, doi:10.1177/0363546504267050
This version was published on October 1, 2004
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The American Journal of Sports Medicine 32:1731-1735 (2004)
© 2004 American Orthopaedic Society for Sports Medicine

A New Mechanical Testing Device for Measuring Anteroposterior Knee Laxity

Andreas J. Schuster, MD*,{dagger}, Mike J. McNicholas, FRCS{ddagger}, Stefan W. Wachtl, MD{dagger}, Douglas W. McGurty§ and Roland P. Jakob, MD{dagger}

From the {dagger} Department of Orthopaedic Surgery, Hôpital Cantonal, Fribourg, Switzerland, {ddagger} Consultant in Trauma and Orthopaedic Surgery, Warrington Hospital, Warrington, England, and the § Department of Orthopaedics and Trauma Surgery, University of Dundee, Scotland

* Address correspondence to Andreas J. Schuster, MD, Hôpital Cantonal, Department of Orthopaedic Surgery, c/o Tulpenweg 79, CH-3098 Köniz, Switzerland (e-mail: andreas.schuster{at}spitalbern.ch).

Background: The authors assessed a new instrument, the Rolimeter, for the measurement of anteroposterior translation in the knee; it was compared to the KT-1000 arthrometer.

Purpose: To determine if the Rolimeter offers a valid method for the measurement of anteroposterior translation that is as reproducible and reliable as the KT-1000 arthrometer.

Methods: Two of 3 observers examined 16 normal subjects (32 knees) and 36 patients (72 knees) with ligament ruptures twice, using both the Rolimeter and the KT-1000 arthrometers, 30 minutes apart. Total anteroposterior translation (manual maximal Lachman test) was recorded at 20° and 80° of knee flexion.

Results: On average, the Rolimeter measured approximately 1 mm less anteroposterior displacement than the KT-1000 arthrometer at manual maximum stress. Rolimeter measurements were more consistent than the KT-1000 measurements as measured by our observers. Specificity and sensitivity were equivalent between the Rolimeter and the KT-1000 arthrometer.

Conclusions: The Rolimeter is as reproducible and reliable as the KT-1000 arthrometer. It offers a valid method for the measurement of anteroposterior translation in the knee. Higher accuracy was obtained at 20° of flexion for the KT-1000 arthrometer and at 80° of flexion for the Rolimeter.

Key Words: Rolimeter • KT-1000 arthrometer • KT-2000 arthrometer • anterior drawer test • anterior cruciate ligament (ACL) • posterior cruciate ligament (PCL)




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