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dc.contributor.authorShimpei Kurataen_US
dc.contributor.authorKazuya Inoueen_US
dc.contributor.authorTakamasa Shimizuen_US
dc.contributor.authorMitsuyuki Nagashimaen_US
dc.contributor.authorHirakazu Murayamaen_US
dc.contributor.authorKenji Kawamuraen_US
dc.contributor.authorShohei Omokawaen_US
dc.contributor.authorPasuk Mahakkanukrauhen_US
dc.contributor.authorYasuhito Tanakaen_US
dc.date.accessioned2022-05-27T08:35:17Z-
dc.date.available2022-05-27T08:35:17Z-
dc.date.issued2022-12-01en_US
dc.identifier.issn14712474en_US
dc.identifier.other2-s2.0-85126879546en_US
dc.identifier.other10.1186/s12891-022-05245-5en_US
dc.identifier.urihttps://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85126879546&origin=inwarden_US
dc.identifier.urihttp://cmuir.cmu.ac.th/jspui/handle/6653943832/73076-
dc.description.abstractBackground: The acromioclavicular (AC) and coracoclavicular (CC) ligaments are important stabilizers of the AC joint. We hypothesized that AC and trapezoid ligament injuries induce AC joint instability and that the clavicle can override the acromion on cross-body adduction view even in the absence of conoid ligament injury. Accordingly, we investigated how sectioning the AC and CC ligaments contribute to AC joint instability in the cross-body adduction position. Methods: Six fresh-frozen cadaveric shoulders were used in this study, comprising five male and one female specimen, with a mean age of 68.7 (range, 51–87) years. The left side of the trunk and upper limb, and the cervical and thoracic vertebrae and sternum were firmly fixed with an external fixator. The displacement of the distal end of the clavicle relative to the acromion was measured using an electromagnetic tracking device. We simulated AC joint dislocation by the sequential resection of the AC ligament, AC joint capsule, and CC ligaments in the following order of stages. Stage 0: Intact AC and CC ligaments and acromioclavicular joint capsule; stage 1: Completely sectioned AC ligament, capsule and joint disc; stage 2: Sectioned trapezoid ligament; and stage 3: Sectioned conoid ligament. The superior clavicle displacement related to the acromion was measured in the horizontal adduction position, and clavicle overriding on the acromion was assessed radiologically at each stage. Data were analyzed using a one-way analysis of variance and post-hoc tests. Results: Superior displacement was 0.3 mm at stage 1, 6.5 mm at stage 2, and 10.7 mm at stage 3. On the cross-body adduction view, there was no distal clavicle overriding at stages 0 and 1, and distal clavicle overriding was observed in five cases (5/6: 83%) at stage 2 and in six cases (6/6: 100%) at stage 3. Conclusion: We found that AC and trapezoid ligament sectioning induced AC joint instability and that the clavicle could override the acromion on cross-body adduction view regardless of conoid ligament sectioning. The traumatic sections of the AC and trapezoid ligament may lead to high grade AC joint instability, and the distal clavicle may subsequently override the acromion.en_US
dc.subjectMedicineen_US
dc.titleAcromioclavicular joint instability on cross-body adduction view: the biomechanical effect of acromioclavicular and coracoclavicular ligaments sectioningen_US
dc.typeJournalen_US
article.title.sourcetitleBMC Musculoskeletal Disordersen_US
article.volume23en_US
article.stream.affiliationsNara Medical Universityen_US
article.stream.affiliationsChiang Mai Universityen_US
Appears in Collections:CMUL: Journal Articles

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