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Quantitative analysis of the measuring capabilities of the KT-1000 knee ligament arthrometer

MedSport, University of Michigan Medical Center, Ann Arbor, Michigan

Edward M. Wojtys, MD

MedSport, University of Michigan Medical Center, Ann Arbor, Michigan

Jeff Disher, MS

MedSport, University of Michigan Medical Center, Ann Arbor, Michigan

Peter Loubert, PhD

MedSport, University of Michigan Medical Center, Ann Arbor, Michigan

The KT-1000 arthrometer was evaluated in vitro and in vivo to determine accuracy and quantify effects of potential error sources in clinical application. The KT- 1000 arthrometer in vitro accuracy was evaluated by making 30 measurements of 13 known displacements (range, +15 to -15 mm). The effect of applied force on malalignment measurements was evaluated in vitro by making repeated measurements with force applied 5°, 10°, and 15° from the vertical position. The effect of malpositioning the device along the joint line was eval uated in vivo by making repeated measurements 1 cm proximal and 1 cm distal to the joint line. The KT-1000 arthrometer was accurate in vitro (average error, 0.13 mm; SD, 0.12 mm). The range of measurements in creased when the angle of force application was in creased. Positioning the device 1 cm proximal to the joint line produced larger anterior translation measure ments in vivo than those at the joint line (5.8 versus 5.4 mm), while positioning it 1 cm distal produced smaller measurements (4.4 mm). The KT-1000 arthrometer's accuracy indicates great potential for clinical applica tion, but one must ensure that the displacing force is directed properly and the device is positioned accu rately over the joint line.

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