Study of Anatomical Justification of Coracoacromial Arch Impingement Due to Diverse Morphology of Acromion Process by Radiographs

The goal of this research was to determine the varied morphologies of the acromion process on radiographs according to Beglani, Edelson, and Traitz. A total of 260 radiographs were taken for this investigation, with 200 radiographs of patients suffering from impingement and 60 radiographs of healthy patients. According to Beglani, there were 33 Type I radiographs, 137 Type II radiographs, and 30 Type III radiographs in this study, with Type II radiographs outnumbering Type I and Type III among symptomatic patients. In the case of normal patients, there were 7 radiographs of Type I, 52 radiographs of Type II, and 1 radiograph of Type III, with Type II radiographs being more numerous than Type I and Type III, and Type III acromion process being anatomically responsible for impingement. According to the Edelson and Traitz classification, 56 radiographs of Cobra shape, 109 radiographs of Intermediate shape, and 35 radiographs of Square tip were found in patients with shoulder pain, while 4 radiographs of Cobra shape, 47 radiographs of Intermediate shape, and 9 radiographs of Square tip were found in patients without shoulder pain. Cobra shape acromion is responsible for impingement in the majority of cases; additionally, Cobra shape acromion converts more quickly to Type III acromion than Square tip and intermediate Shape acromion.

In addition, we can see that the Coracoacromial arch distance is much smaller in Type III acromion than in other types of acromion. Beglani claims that the P value is 0.000. According to Edelson and Traitz, the P value for coracoacromial arch is also 0.001, indicating that it is highly significant. The p value is not significant in normal radiographs of patients without shoulder pain.