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This Article Full Text Full Text (PDF) All Versions of this Article: 32/7/1731    most recent 0363546504267050v1 Alert me when this article is cited Alert me if a correction is posted Citation Map Services Email this article to a friend Similar articles in this journal Similar articles in ISI Web of Science Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Request Permissions Request Reprints Citing Articles Citing Articles via HighWire Citing Articles via ISI Web of Science (6) Citing Articles via Google Scholar Google Scholar Articles by Schuster, A. J. Articles by Jakob, R. P. Search for Related Content PubMed PubMed Citation Articles by Schuster, A. J. Articles by Jakob, R. P. Related Collections Injury Reconstruction Knee

A New Mechanical Testing Device for Measuring Anteroposterior Knee Laxity

Andreas J. Schuster, MD^*,, Mike J. McNicholas, FRCS, Stefan W. Wachtl, MD, Douglas W. McGurty and Roland P. Jakob, MD

From the Department of Orthopaedic Surgery, Hôpital Cantonal, Fribourg, Switzerland, 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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