Objective To explore the correlation between radiological anatomical factors of scapula and non-traumatic rotator cuff tear. Methods The shoulder joint anteroposterior and "Y" position X-ray films of 50 patients confirmed by surgery with non-traumatic rotator cuff tear and 48 normal adults were retrospectively analyzed. Lateral acromion angle, critical shoulder angle, acromion index, and glenoid inclination of two groups were measured. And sharpened lateral acromion morphology, acromion morphology, acromioclavicular joint osteophyte, subacromial bone sclerosis were observed. The statistical differences between imaging anatomical parameters of two groups were compared. Logistic regression was used to analyze independent influencing factors for non-traumatic rotator cuff tears. Receiver operating characteristic (ROC) curve was used to analyze the diagnostic efficacy of independent influencing factors for non-traumatic rotator cuff tear. Results There were no statistical differences in age, gender, side, body mass index (BMI), manual worker, acromion morphology, and acromioclavicular joint osteophyte between two groups (P>0.05). However, there were statistical differences in lateral acromion angle, critical shoulder angle, acromion index, glenoid inclination, sharpened lateral acromion morphology, and subacromial bone sclerosis (P<0.05). The lateral acromion angle of the rotator cuff tear group was lower than that of control group, while critical shoulder angle, acromion index, glenoid inclination, sharpened lateral acromion morphology, and subacromial bone sclerosis were higher than those of control group. Lateral acromial angle was a protective factor for non-traumatic rotator cuff tear, while the acromion index and glenoid inclination were independent risk factors. The area under ROC curve of lateral acromial angle was 0.793, with sensitivity of 62.5% and specificity of 90.0%. The area under ROC curve of acromion index was 0.749, with sensitivity of 78.0% and specificity of 60.4%. The area under ROC curve of glenoid inclination was 0.756, with sensitivity of 72.0% and specificity of 77.1%. The area under ROC curve of combined diagnosis was 0.897, with sensitivity of 89.6% and specificity of 76.0%. Conclusions Lateral acromion angle, critical shoulder angle, acromion index, glenoid inclination, sharpened lateral acromion morphology, and subacromial bone sclerosis are correlated with non-traumatic rotator cuff tear. Lateral acromial angle is a protective factor for non-traumatic rotator cuff tear, while the acromion index and glenoid inclination are independent risk factors.
Key words
Scapula; /
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Non-traumatic rotator cuff tear; /
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Radiologic anatomy; /
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Correlation analysis
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