{"title":"Acromion types and morphometric evaluation of subacromial impingement syndrome in the Chinese population.","authors":"Yuanxun Lin, Jundan Wei, Lixin Tang, Zhiyu Feng, Yunaolong Zhang, Yikai Li","doi":"10.5603/fm.103390","DOIUrl":null,"url":null,"abstract":"<p><strong>Background: </strong>The acromion can have different shapes and sizes among different populations. Measuring the morphological structures of the shoulder joint can facilitate a better understanding of the causes of SIS issues. The study explores the correlation between acromion types and the morphological measurements of acromion in SIS among the Chinese population.</p><p><strong>Materials and methods: </strong>A retrospective study. Between January 2024 and September 2024, MRI of 128 cases that were diagnosed as SIS and met the criteria were included in the study. Measurements taken from the MRI images included types of acromion, acromion humeral distance (AHD), acromion index (AI), acromion-greater tubercle impingement index (ATI), critical shoulder angle (CSA), lateral acromion angle (LAA), and slope of the acromion.</p><p><strong>Results: </strong>Type Ⅰ acromion was observed in 29 cases (22.66%), type Ⅱ acromion in 79 cases (61.72%), and type Ⅲ acromion in 20 cases (15.62%). AHD, AI, ATI, CSA, LAA, and slope of acromion among the various acromion types. (AHD: p＜0.001; AI: p = 0.002; ATI: p = 0.009; CSA: p＜0.001; LAA: p＜0.001; slope of acromion: p＜0.001) According to type Ⅰ and type Ⅱ acromions characteristic curve analysis, the cut-off values for AI, ATI, CSA, LAA, and slope of acromion were 0.76, 0.96, 53.37°, 77.82° and 10.12°. According to type Ⅱ and type Ⅲ acromions characteristic curve analysis, the cut-off values for AHD and slope of acromion were 8.51mm and 15.77°.</p><p><strong>Conclusions: </strong>In summary, AHD, AI, ATI, CSA, LAA, and the slope of the acromion show significant differences among the three types of acromion in subacromial impingement syndrome. The slope of the acromion serves as a reliable MRI measurement parameter for distinguishing between type Ⅰ and type Ⅱ acromions, as well as type Ⅱ and type Ⅲ acromions in SIS patients. These measurement parameters are of great importance for diagnosing and treating subacromial impingement syndrome.</p>","PeriodicalId":12251,"journal":{"name":"Folia morphologica","volume":" ","pages":""},"PeriodicalIF":1.2000,"publicationDate":"2025-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Folia morphologica","FirstCategoryId":"3","ListUrlMain":"https://doi.org/10.5603/fm.103390","RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"ANATOMY & MORPHOLOGY","Score":null,"Total":0}
引用次数: 0
Abstract
Background: The acromion can have different shapes and sizes among different populations. Measuring the morphological structures of the shoulder joint can facilitate a better understanding of the causes of SIS issues. The study explores the correlation between acromion types and the morphological measurements of acromion in SIS among the Chinese population.
Materials and methods: A retrospective study. Between January 2024 and September 2024, MRI of 128 cases that were diagnosed as SIS and met the criteria were included in the study. Measurements taken from the MRI images included types of acromion, acromion humeral distance (AHD), acromion index (AI), acromion-greater tubercle impingement index (ATI), critical shoulder angle (CSA), lateral acromion angle (LAA), and slope of the acromion.
Results: Type Ⅰ acromion was observed in 29 cases (22.66%), type Ⅱ acromion in 79 cases (61.72%), and type Ⅲ acromion in 20 cases (15.62%). AHD, AI, ATI, CSA, LAA, and slope of acromion among the various acromion types. (AHD: p＜0.001; AI: p = 0.002; ATI: p = 0.009; CSA: p＜0.001; LAA: p＜0.001; slope of acromion: p＜0.001) According to type Ⅰ and type Ⅱ acromions characteristic curve analysis, the cut-off values for AI, ATI, CSA, LAA, and slope of acromion were 0.76, 0.96, 53.37°, 77.82° and 10.12°. According to type Ⅱ and type Ⅲ acromions characteristic curve analysis, the cut-off values for AHD and slope of acromion were 8.51mm and 15.77°.
Conclusions: In summary, AHD, AI, ATI, CSA, LAA, and the slope of the acromion show significant differences among the three types of acromion in subacromial impingement syndrome. The slope of the acromion serves as a reliable MRI measurement parameter for distinguishing between type Ⅰ and type Ⅱ acromions, as well as type Ⅱ and type Ⅲ acromions in SIS patients. These measurement parameters are of great importance for diagnosing and treating subacromial impingement syndrome.
背景：不同人群的肩峰形状和大小不同。测量肩关节的形态结构有助于更好地了解SIS问题的原因。本研究探讨了中国SIS人群肩峰类型与肩峰形态学测量的相关性。材料与方法：回顾性研究。在2024年1月至2024年9月期间，128例诊断为SIS并符合标准的MRI纳入研究。MRI图像测量包括肩峰类型、肩峰肱骨距离（AHD）、肩峰指数（AI）、肩峰-大结节撞击指数（ATI）、临界肩关节角（CSA）、肩峰外侧角（LAA）和肩峰坡度。结果：Ⅰ型肩峰29例（22.66%），Ⅱ型肩峰79例（61.72%），Ⅲ型肩峰20例（15.62%）。不同肩峰类型间的AHD、AI、ATI、CSA、LAA及肩峰坡度。(和:p < 0.001;AI: p = 0.002；ATI: p = 0.009；CSA: p < 0.001;LAA: p < 0.001;肩峰斜率：p<0.001)根据Ⅰ型和Ⅱ型肩峰特征曲线分析，AI、ATI、CSA、LAA与肩峰斜率的临界值分别为0.76、0.96、53.37°、77.82°和10.12°。根据Ⅱ型和Ⅲ型肩峰特征曲线分析，AHD和肩峰坡度的临界值分别为8.51mm和15.77°。结论：综上所述，AHD、AI、ATI、CSA、LAA和肩峰斜度在三种类型的肩峰下撞击综合征中存在显著差异。肩峰斜率是SIS患者区分Ⅰ型和Ⅱ型肩峰以及Ⅱ型和Ⅲ型肩峰的可靠MRI测量参数。这些测量参数对肩峰下撞击综合征的诊断和治疗具有重要意义。
期刊介绍：
"Folia Morphologica" is an official journal of the Polish Anatomical Society (a Constituent Member of European Federation for Experimental Morphology - EFEM). It contains original articles and reviews on morphology in the broadest sense (descriptive, experimental, and methodological). Papers dealing with practical application of morphological research to clinical problems may also be considered. Full-length papers as well as short research notes can be submitted. Descriptive papers dealing with non-mammals, cannot be accepted for publication with some exception.
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