Introduction: There is a main concern about the usefulness and the accuracy of the different laximeters. The GnrB device is becoming more popular, but according to the literature it's not clear whether it is fully reliable.
Objective: GNRB laxity measurements are not reproducible for measurement of anterior translation of the tibia.
Material and methods: We analyzed the reproducibility of GNRB measurements in healthy subjects by the Test-Retest method in 2 sessions.
Results: 30 pairs of healthy knees were assessed. Test-Retest agreement was poor for both absolute values and for differentials at 134 and 200 N with an intra-class correlation ranging from 0.210 to 0.486. There was a significant differance in anterior tibial translation, in side-to-side difference, according to the patellar pressure.
Conclusion: The reproducibility is found to be poor under optimum conditions of comparability. The patellar pressure influences strongly thelaxity value.
Keywords: GNRB; Knee surgery; Laximeter.
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