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KMID : 1037920160030020077
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Arthroscopy and Orthopedic Sports Medicine
2016 Volume.3 No. 2 p.77 ~ p.82
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Reliability of the GNRB® system for the measurement of anterior laxity of the knee: a comparison with the TelosTM device on 85 knees
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Seo Jin-Hyeok
Seo Seung-Suk
Kim Yeon-Gu
Kim Ok-Gul
Park Beyoung-Yun
Kim Do-Hun
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Abstract
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Background: The purpose of this study was to investigate whether the GNRB® arthrometer (Genourb) is a viable alternative to the TelosTM device (GmbH) in terms of diagnosing anterior cruciate ligament (ACL) tears.
Methods: We carried out a prospective cohort study from January 2013 to March 2015 on 85 patients whose symptoms necessitated arthroscopic procedures of the knee. We measured preoperative anterior knee laxity in both the affected and the unaffected knees of the patients through the TelosTM device and the GNRB® arthrometer. We defined the standard reference ACL as that observed arthroscopically for subsequent evaluations of diagnostic performance of the TelosTM device and the GNRB® arthrometer.
Results: We arthroscopically classified the patients into the following categories of ACL integrity: 14 patients (16.5%) were categorized into the normal ACL group; 6 patients (7.1%), into the healed to the roof of the notch group; 7 patients (8.2%), into the preserved posterolateral bundle group; 6 patients (7.1%), into the healed-to-PCL group; and 52 patients (61.2%), into the complete tear group. In the complete tear group, the anterior tibial translations were significantly larger than those of the normal ACL group, of the partial tear groups, and of the healed-to-PCL group, independently of the two measuring techniques. We found that the TelosTM device showed a sensitivity of 96.6% and a specificity of 92.9% at a cutoff value of 3.2 mm. The values of the GNRB® arthrometer showed a sensitivity of 100% and a specificity of 92.9%. Thus, we found that the TelosTM device and the GNRB® arthrometer showed similar diagnostic performance.
Conclusion: We found that not only is the GNRB® arthrometer clinically useful having no risk of radiation exposure, it can also be performed repeatedly during diagnostic arthroscopy and during passage observations.
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KEYWORD
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Knee, Anterior cruciate ligament, Joint instability, GNRB®, TelosTM
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