Clinical study on the relationship between critical shoulder joint angle and degenerative rotator cuff tear

doi:10.3969/j.issn.2095-4344.2923

Abstract

Abstract:

BACKGROUND: The anatomical structure of the shoulder blade is related to the occurrence of a rotator cuff tear, and critical shoulder angle (CSA) can reflect the individual anatomical differences of the shoulder blade. In recent years, studies have found that CSA is a risk factor for rotator cuff tear; however, its diagnostic value for rotator cuff tear in Chinese population still needs further research.

OBJECTIVE: To analyze whether CSA is a risk factor for rotator cuff tear in Chinese people, and to explore the risk level of CSA in degenerative rotator cuff tear in comparison with acromion index (AI) and glenoid inclination.

METHODS: Thirty-two patients who had been diagnosed with rotator cuff tear from January 2016 to December 2018 were collected as the tear group, including 17 males and 15 females, aged 37-75 years, with an average age of (54.7±9.2) years. Meanwhile, another 34 patients without rotator cuff tear were selected as the control group, including 19 males and 15 females, aged from 35 to 91 years, with an average (53.6±11.8) years. The CSA, AI and β angle of the glenoid cavity were compared between two groups. Correlation analysis and receiver operating characteristic curve analysis were performed for each parameter to determine the cutoff value and the area under the curve.

RESULTS AND CONCLUSION: The mean CSA and AI of the tear group were significantly higher than those of the control group (37.4° vs. 34.1°, P < 0.001; 0.72 vs. 0.68, P=0.007). However, there was no significant difference between the tear group and the control group in the β angle of the glenoid cavity and age (P > 0.05). In the correlation analysis, only CSA showed a high positive correlation with AI among all parameters (r=0.848, P < 0.001), whereas there was no correlation between the other parameters (P > 0.05). In the receiver operating characteristic curve analysis, the area under the curve of CSA and AI was 0.752 and 0.663, respectively, with cut-off values of 37.5 and 0.72. To conclude, It may be a risk factor of degenerative rotator cuff tear for Chinese people, and it has a higher risk level of degenerative rotator cuff tear than the acromion index.

Key words: ">rotator cuff tear, critical shoulder angle, acromion index, X-ray of the shoulder joint, inclination of the glenoid cavity, supraspinatus tear, rotator cuff repair, radiological parameter

CLC Number:

Huo Yanxu, Yang Zhi, Pei Fang, Chen Xiangyang. Clinical study on the relationship between critical shoulder joint angle and degenerative rotator cuff tear[J]. Chinese Journal of Tissue Engineering Research, 2020, 24(35): 5644-5649.

Figures/Tables 7

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