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Please use this identifier to cite or link to this item: http://hdl.handle.net/10564/3345

Title: Human knee joint sound during the Lachman test: Comparison between healthy and anterior cruciate ligament-deficient knees.
Other Titles: Lachmanテスト時に発生する膝関節音 : 健常膝と前十字靭帯損傷膝での比較検討
Authors: Tanaka, Kazunori
Ogawa, Munehiro
Inagaki, Yusuke
Tanaka, Yasuhito
Nakayama, Hitoshi
Hattori, Koji
Issue Date: May-2017
Publisher: Elsevier
Citation: Journal of orthopaedic science Vol.22 No.3 p.488-494 (2017 May)
Abstract: BACKGROUND: The Lachman test is clinically considered to be a reliable physical examination for anterior cruciate ligament (ACL) deficiency. However, the test involves subjective judgement of differences in tibial translation and endpoint quality. An auscultation system has been developed to allow assessment of the Lachman test. The knee joint sound during the Lachman test was analyzed using fast Fourier transformation. The purpose of the present study was to quantitatively evaluate knee joint sounds in healthy and ACL-deficient human knees. METHODS: Sixty healthy volunteers and 24 patients with ACL injury were examined. The Lachman test with joint auscultation was evaluated using a microphone. Knee joint sound during the Lachman test (Lachman sound) was analyzed by fast Fourier transformation. As quantitative indices of the Lachman sound, the peak sound (Lachman peak sound) as the maximum relative amplitude (acoustic pressure) and its frequency were used. RESULTS: In healthy volunteers, the mean Lachman peak sound of intact knees was 100.6 Hz in frequency and -45 dB in acoustic pressure. Moreover, a sex difference was found in the frequency of the Lachman peak sound. In patients with ACL injury, the frequency of the Lachman peak sound of the ACL-deficient knees was widely dispersed. In the ACL-deficient knees, the mean Lachman peak sound was 306.8 Hz in frequency and -63.1 dB in acoustic pressure. If the reference range was set at the frequency of the healthy volunteer Lachman peak sound, the sensitivity, specificity, positive predictive value, and negative predictive value were 83.3%, 95.6%, 95.2%, and 85.2%, respectively. CONCLUSION: Knee joint auscultation during the Lachman test was capable of judging ACL deficiency on the basis of objective data. In particular, the frequency of the Lachman peak sound was able to assess ACL condition.
Description: 博士(医学)・甲第673号・平成29年6月28日
Copyright © 2016 The Japanese Orthopaedic Association. Published by Elsevier B.V. All rights reserved.
URI: http://hdl.handle.net/10564/3345
ISSN: 09492658
Academic Degrees and number: 24601A673
Degree-granting date: 2017-06-28
Degree name: 博士(医学)
Degree-granting institutions: 奈良県立医科大学
Appears in Collections:2017年度

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