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  • Title: Objective evaluation of anterior knee laxity; comparison of the KT-1000 and GNRB® arthrometers.
    Author: Collette M, Courville J, Forton M, Gagnière B.
    Journal: Knee Surg Sports Traumatol Arthrosc; 2012 Nov; 20(11):2233-8. PubMed ID: 22231269.
    Abstract:
    PURPOSE: Accurate measurement of laxity after anterior cruciate ligament (ACL) rupture is usually performed with the KT-1000 arthrometer, and reproducibility and reliability are discussed. A new arthrometer, the GNRB(®), has been recently developed in an attempt to improve intra- and inter-examiner reproducibility. The aim of this diagnostic study was to evaluate the intra- and inter-examiner reproducibility of the GNRB(®) and the KT-1000. METHODS: Three protocols were designed to evaluate and compare the two arthrometers. Fifteen physiotherapists conducted tests on 15 subjects with healthy knees. The intra- and inter-reproducibility of the two tests were compared by analysis of variance and the F-test. RESULTS: Measure reproducibility was significantly worst with the KT-1000 than with the GNRB(®) (machine effect, P < 0.001) regardless of operator experience. There was no significant difference between experienced and inexperienced examiners with the GNRB(®) (no 'examiners effect'). Regardless of the machine, there was a 'side effect' with healthy knees. CONCLUSION: This clinical study demonstrates the superior intra- and inter-examiner reproducibility of the GNRB(®) over the KT-1000. There appears to be some technological advantages to using the GNRB(®) including pressure control of the patella, accuracy of the displacement transducer, control of the load on the calf, and control of hamstring activity. LEVEL OF EVIDENCE: Diagnostic study, Level I.
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