Objective To measure acromial morphology and the angles proposed by Aragão, providing a more objective measurement method for acromion classification in the Chinese population. Methods A total of 118 normal, dry scapula specimens from Chinese individuals, the acromion was classified into three types (type I, type II and type III) according to the Bigliani classification. Measured parameters included the following: the acromial length, acromial width, acromion-glenoid distance, acromion-coracoid distance, the acromial inclination angle formed by the line from the acromion tip to the acromial angle and the horizontal line, ∠a formed by the extension line from the acromion tip to the midpoint of the coracoid and the extension line from the midpoint of the coracoid to the superior glenoid tubercle, ∠b formed by the extension line from the acromion tip to the acromial angle and the extension line from the acromial angle to the superior glenoid tubercle, and ∠c formed by the line from the acromion tip to the acromial angle and the line from the acromion tip to the superior glenoid tubercle. Results There was no significant difference in the acromion classification of the left and right scapulae (P=0.460). There were no significant difference in the acromial length (P=0.374), acromial width (P=0.912), acromion-coracoid distance (P=0.536), and ∠a (P=0.107) among the different acromion types. However, there were significant differences in the acromion-glenoid distance (P<0.001), acromial inclination angle (P=0.005), ∠b (P=0.003), and ∠c (P<0.001) among the different acromion types. In ROC curve analysis, when differentiating between Type I and Type II acromion, only the distance from the acromion to the glenoid (EG) showed a P-value <0.05, with a truncation value of 31.09 cm. In distinguishing between Type II and Type III acromion, the acromion-glenoid distance (EG), ∠b, and ∠c all showed P-values <0.05, with respective truncation values of 28.26 cm, 37.46°, and 73.98°. Conclusions In distinguishing between Type I and Type II acromion, an acromion classified as Type I when the distance from the acromion to the glenoid is ≥31.09 cm. In the differentiation between Type II and Type III acromion, if the acromion-glenoid distance ≥28.26 cm, or ∠b≥37.46°, or ∠c≥73.98°, the acromion can be classified as Type II. These findings have reference value for clinical practice.
Key words
Scapula /
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Acromion /
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Types of acromion /
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Parameter measurements
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