抄録
The purpose of this study is to investigate the anatomical variations of the coracoid process in Japanese people using CT scan.
[Materials and methods]102 shoulders in 71 cases were examined with a CT scan.46 men and 25women were included. The diagnosis of these cases were a rotator cuff tear in 40 shoulders and others in 62 shoulders. (1)the coracoglenoid angle (CGA), (2)the coracoid overlap (CO) and (3)the coracohumeral distance (CHD) were measured from CT images using an Advantage Windows Version3.1.
[Results] The CGA averaged 147.0°, the CO averaged 11.2mm and the CHD in patients with a rotator cuff tear averaged 8.8mm and the CHD in patients without rotator cuff tear was 10.7mm. No significant difference was observed between the right and left shoulders. In the CHD, there was a significant narrowing in the group with a rotator cuff tear compared to the group without a rotator cuff tear.
[Discussion]Although the morphological variation of the coracoid process was found in each case, a variation between the right and left shoulder was not observed. Comparing CHDs between right and left shoulders is useful to diagnose a subcoracoid impingement,
