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Please use this identifier to cite or link to this item: http://hdl.handle.net/10564/3993

Title: The Role of the Acromioclavicular Ligament in Acromioclavicular Joint Stability: A Cadaveric Biomechanical Study.
Other Titles: 肩鎖関節の安定性における肩鎖靭帯の役割 : 新鮮凍結屍体を用いた生体力学的研究
Authors: Kurata, Shimpei
Inoue, Kazuya
Hasegawa, Hideo
Shimizu, Takamasa
Iida, Akio
Kawamura, Kenji
Omokawa, Shohei
Mahakkanukrauh, Pasuk
Tanaka, Yasuhito
Keywords: biomechanical study
fresh-frozen cadaveric study
acromioclavicular joint dislocation
acromioclavicular ligament
Rockwood classification
Issue Date: 10-Feb-2021
Publisher: SAGE Publishing
Citation: Orthopaedic journal of sports medicine Vol.9 No.2 Article No.2325967120982947 (2021 Feb)
Abstract: Background: Acromioclavicular (AC) joint dislocation is evaluated using the radiologically based Rockwood classification. The relationship between ligamentous injury and radiological assessment is still controversial. Purpose/hypothesis: To investigate how the AC ligament and trapezoid ligament biomechanically contribute to the stability of the AC joint using cadaveric specimens. The hypothesis was that isolated sectioning of the AC ligament would result in increased instability in the superior direction and that displacement >50% of the AC joint would occur. Study design: Controlled laboratory study. Methods: Six shoulders from 6 fresh-frozen cadavers were used in this study. Both the scapula and sternum were solidly fixed on a customized wooden jig with an external fixator. We simulated distal clavicular dislocation with sequential sectioning of the AC and coracoclavicular (CC) ligaments. Sectioning stages were defined as follows: stage 0, the AC ligament, CC ligament, and AC joint capsule were left intact; stage 1, the anteroinferior bundle of the AC ligament, joint capsule, and disk were sectioned; stage 2, the superoposterior bundle of the AC ligament was sectioned; and stage 3, the trapezoid ligament was sectioned. The distal clavicle was loaded with 70 N in the superior and posterior directions, and the magnitudes of displacement were measured. Results: The amounts of superior displacement averaged 3.7 mm (stage 0), 3.8 mm (stage 1), 8.3 mm (stage 2), and 9.5 mm (stage 3). Superior displacement >50% of the AC joint was observed in stage 2 (4/6; 67%) and stage 3 (6/6; 100%). The magnitudes of posterior displacement were 3.7 mm (stage 0), 3.7 mm (stage 1), 5.6 mm (stage 2), and 9.8 mm (stage 3). Posterior displacement >50% of the AC joint was observed in stage 3 (1/6; 17%). Conclusion: We found that the AC ligaments contribute significantly to AC joint stability, and superior displacement >50% of the AC joint can occur with AC ligament tears alone. Clinical relevance: The AC ligament plays an important role not only in horizontal stability but also in vertical stability of the AC joint.
Description: 博士(医学)・甲第810号・令和4年3月15日
© The Author(s) 2021. This open-access article is published and distributed under the Creative Commons Attribution - NonCommercial - No Derivatives License (https://creativecommons.org/ licenses/by-nc-nd/4.0/), which permits the noncommercial use, distribution, and reproduction of the article in any medium, provided the original author and source are credited. You may not alter, transform, or build upon this article without the permission of the Author(s). For article reuse guidelines, please visit SAGE’s website at http://www.sagepub.com/journals-permissions.
URI: http://hdl.handle.net/10564/3993
ISSN: 23259671
DOI: https://doi.org/10.1177/2325967120982947
Academic Degrees and number: 24601A810
Degree-granting date: 2022-03-15
Degree name: 博士(医学)
Degree-granting institutions: 奈良県立医科大学
Appears in Collections:2021年度

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