Abstract
We thank Dr. Alam and his associates for their critical attention and comments. The Cronbach α was not used to verify the accuracy of the measured values but was used to validate the reproducibility. We are familiar with the studies they cite in their letter, and the problem of inaccuracy of the measurement of the rotation angle using a boot with the ankle in neutral position is known (the problem with the Rottometer). It is well known that fixation and measurement of the soft tissue of the lower leg do not make sense. Thus, as described in our article, in this experimental setup, dorsiflexion of the ankle was used to fix the trapezoid talus in the malleolar fork to minimize this error. The foot was not fixed on the soft tissue. The heads of metatarsals 1 and 5 and the calcaneus served as a counter-bearing. The measurements were calculated only in side-to-side comparison. This means that any angle inaccuracies are neutralized in the calculation. It would be an honor for us to invite Dr. Alam and his group to check out the measurement technique in our clinic. We hope to have served with this explanation. Problems With “Validation of a Measurement Device for Instrumented Quantification of Anterior Translation and Rotational Assessment of the Knee”ArthroscopyVol. 28Issue 2PreviewWe read with interest the recent article by Mayr et al.1 However, there are two related problems we would like to discuss. The first is regarding the accuracy of the “Laxitester.” The authors used the t test for independent and dependent samples to analyze the differences between the readings from healthy and pathologic knees. In addition, reliability was analyzed by use of intratester and intertester correlation according to the Cronbach α.1 However, neither of these methods assesses the accuracy of the measuring device; that is, how closely do the readings from the Laxitester reflect the translations and rotations occurring at the knee? What is reported is a comparison between measurements of foot and ankle rotations between subjects with normal and abnormal knees, as well as correlation of these foot and ankle rotations between testers. Full-Text PDF
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