Radiographic Study on the Acromion Index and Its Relationship With Rotator Cuff Tears

Miyazaki, Alberto Naoki; Fregoneze, Marcelo; Santos, Pedro Doneux; Silva, Luciana Andrade da; Martel, Éder Menegassi; Debom, Leandro Gervazoni; Andrade, Manoel Loyola; Checchia, Sérgio Luiz

doi:10.1016/s2255-4971(15)30285-8

Cited by 13 publications

(8 citation statements)

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“…These findings were also observed by Hanciau et al 17 Nevertheless, Nyffeler et al 4 introduced the concept of acromion index, suggesting that a greater lateral projection of the acromion would be a possible cause of this injury. Miyazaki et al 18 have confirmed this correlation for the Brazilian population.…”

Section: Discussionmentioning

confidence: 68%

Relationship between the critical shoulder angle and the development of rotator cuff lesions: a retrospective epidemiological study

Gomide

Carmo

Bergo

et al. 2017

Revista Brasileira de Ortopedia (English Edition)

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ObjectiveTo perform a retrospective epidemiological study of radiographs in order to evaluate the relationship between the anatomy of the scapula and the development of rotator cuff injuries (RCIs).MethodsThis study retrospectively evaluated the relation of the critical shoulder angle (CSA) and RCIs from January 2011 to November 2013; patients were examined in the Orthopedics and Traumatology Department of a university hospital. The CSA was measured by radiographic standardization of two groups: a control group of 34 asymptomatic shoulders and a study group of 44 shoulders with complete RCIs.ResultsThe mean age in the control group was 59.97 years (45–84) and the mean age in the group with RCIs was 59.75 years (45–84). Regarding the CSA, the control group had a mean angle of 33.59° (±3.37) and the group with RCIs had a mean angle of 39.75° (±5.35; p < 0.007).ConclusionThere is an association between CSA and RCIs.

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Section: Discussionmentioning

confidence: 68%

Relationship between the critical shoulder angle and the development of rotator cuff lesions: a retrospective epidemiological study

Gomide

Carmo

Bergo

et al. 2017

Revista Brasileira de Ortopedia (English Edition)

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“…Another morphometric parameter is the acromial index (AI), which is obtained as the ratio between the distance from the glenoid cavity to the lateral border and the distance from the glenoid cavity to the lateral border of the humerus. 19 , 20 , 21 In a study on a Brazilian population, Miyazaki et al 21 concluded that RCIs may be associated with greater AI, i.e. greater lateral projection of the acromion.…”

Section: Discussionmentioning

confidence: 99%

Analysis on the acromial curvature and its relationships with the subacromial space and types of acromion

Aragão

Silva

Reis

et al. 2014

Revista Brasileira de Ortopedia (English Edition)

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ObjectiveTo correlate the acromial curvature, using the angles proposed, with the subacromial space and types of acromion.MethodsNinety scapulas were studied. The acromia were classified as types I, II or III. The acromial curvature was analyzed by means of the alpha, beta and theta angles. We also measured the distance between the anteroinferior extremity of the acromion and the supraglenoid tubercle (DA). The scapulas were grouped in relation to sex and age. The angles proposed were analyzed in relation to each type of acromion and also in relation to the measurements of the distance DA.ResultsOut of the total number of acromia, 39 (43.3%) were type I, 43 (47.7%) type II and eight (9%) type III. The mean ages for each type of acromion (I–III) were 45.6, 55.2 and 51.1 years, respectively. The proportions of the different types of acromion varied in relation to sex and age. The evaluations on the mean beta angle (p = 0.008) and theta angle (p = 0.028), with comparisons in relation to each type of acromion and measurements of the distance DA (p = 0.037), were shown to be statistically significant.ConclusionThe angles proposed in our study can be used for morphometric analysis on the acromion, especially regarding its curvature, and can contribute towards studies on diseases of the shoulder and aid in surgical planning and analysis of the acromial slope, by means of radiography or magnetic resonance.

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“…1−4 Many of these used anthropometric techniques to identify a number of relevant parameters, including the acromion index (AI), which was used to assess lateral extension of the acromion, and the lateral acromion angle (LAA), defined as the angle between the inferior surface of the acromion and the surface of the glenoid cavity. The findings showed that a high AI was associated with risk of full-thickness rotator cuff tear 1,5,6 and identified a statistically significant correlation between the LAA and magnetic resonance imaging (MRI)-determined rotator cuff tear. 6 In another study, Moor et al used the critical shoulder angle (CSA) to comprehensively analyze the inclination of the glenoid and the AI and LAA.…”

Section: Introductionmentioning

confidence: 95%

“…The findings showed that a high AI was associated with risk of full-thickness rotator cuff tear 1,5,6 and identified a statistically significant correlation between the LAA and magnetic resonance imaging (MRI)-determined rotator cuff tear. 6 In another study, Moor et al used the critical shoulder angle (CSA) to comprehensively analyze the inclination of the glenoid and the AI and LAA. They found that a significantly larger CSA was associated with degenerative rotator cuff tears.…”

Section: Introductionmentioning

confidence: 95%

Correlation of Multiple Acromion Morphological Parameters on Radiographs in a Chinese Population

Zhu

Zhao

et al. 2020

Preprint

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BackgroundPrevious clinical studies have reported associations between the acromion index (AI), lateral acromion angle (LAA), and critical shoulder angle (CSA) and the occurrence of rotator cuff tears. The objective of this study was to analyze the correlations of these different anatomic parameters. Materials and MethodsHealthy Chinese participants ( n = 66) and Chinese patients with rotator cuff tears ( n = 70) identified between January 2014 and October 2015 were included in this study. Standardized true anteroposterior radiographs were used to measure the AI, LAA, and CSA in each study participant. ResultsThe mean AI was significantly larger (0.71 standard deviation SD, 0.05; range 0.58-0.89 vs. 0.64 SD, 0.06; range 0.55-0.78; P < 0.001), the mean LAA was significantly smaller (77.0° SD, 5.73; range 61.0°-94.5° vs. 82.0° SD, 7.33; range 67.6°-98.3°; P < 0.001), and the mean CSA was significantly larger (36.1° SD, 5.29; range 21.3°-42.4° vs. 31.6° SD, 5.29; range 21.4°-45.8°; P < 0.001) in patients with full-thickness rotator cuff tears compared with healthy participants. ConclusionsThere were a negative linear relationship between the AI and LAA (rotator cuff tears: R = −0.759, P < 0.01; healthy participants: R = −0.813, P < 0.01) and a positive linear relationship between the AI and CSA (rotator cuff tears: R = 0.854, P < 0.01; healthy participants: R = 0.912, P < 0.01) in patients with rotator cuff tear and healthy participants; we termed this phenomenon "The Acromion Rule." The AI, LAA, and CSA are independent predictors of rotator cuff tears in a Chinese population.MY designed the clinical studies, and drafted the manuscript. XZ, SZ, AD carried out the clinical studies. YZ, LG, DL revised the manuscript. FT, NA and carried out the data acquisition and data analysis. RH, CW carried out literature search and manuscript editing. Ethics approval and consent to participateThis article does not contain any studies with human participants or animals performed by any of the authors. The experimental protocol was established according to the ethical guidelines of the Helsinki Declaration, and ethical approval for this study was provided by Dalian University Affiliated Zhongshan Hospital. All patients or guardians, after reading, filled in and signed the consent form and agreed to participate in the study. Consent for publicationThis section is not applicable for our study.

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Radiographic Study on the Acromion Index and Its Relationship With Rotator Cuff Tears

Cited by 13 publications

References 8 publications

Relationship between the critical shoulder angle and the development of rotator cuff lesions: a retrospective epidemiological study

Relationship between the critical shoulder angle and the development of rotator cuff lesions: a retrospective epidemiological study

Analysis on the acromial curvature and its relationships with the subacromial space and types of acromion

Correlation of Multiple Acromion Morphological Parameters on Radiographs in a Chinese Population

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