Abstract
Aim: This study aimed to evaluate the effects of coracoid morphology, coracohumeral distance,coracoglenoid angle, and coracohumeral angle on subcoracoid impingement using MRI.
Material and Method: A total of 255 patients (115 men with a mean age of 51.25±15.77 years and 140 women with a mean age of 53.13±14.75 years) were included in this retrospective study. All MRI examinations were performed in the standard position. Coracoid morphology and subscapularis tendon were evaluated. Coracohumeral distance, coracoglenoid angle, and coracohumeral angle were measured in all cases. One-way ANOVA was used to analyze the differences between the groups. The Tukey post-hoc test was performed for paired comparisons. The Pearson correlation analysis was undertaken to demonstrate the relationship between the variables. Result: Subscapularis tendon rupture was the most common type C coracoid. Coracohumeral distance, coracoglenoid angle and coracohumeral angle values did not significantly differ according to coracoid types (p>0.05). However, there was a statistically significant decrease in coracoglenoid angle and coracohumeral distance values in patients with subscapularis tendon rupture (p=0.000). No difference was found in the mean coracohumeral angle values between the normal tendon, tendinosis and rupture groups (p>0.05). There was a positive correlation between coracohumeral distance and coracoglenoid angle (r=0.239, p<0.001), and a negative correlation between coracoglenoid angle and coracohumeral angle (r=-0.320, p<0.001). Conclusion: Coracohumeral distance and coracoglenoid angle were observed to decrease
in subscapularis tendon pathologies while the coracohumeral angle had not changed. Type C coracoid is an effective and important factor in subcoracoid impingement.