Department of Radiology, Institute of Clinical Sciences, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden.
Department of Musculoskeletal Radiology, Sahlgrenska University Hospital, Göteborgsvägen 31, 431 80, Gothenburg, Sweden.
Surg Radiol Anat. 2022 Jul;44(7):951-961. doi: 10.1007/s00276-022-02973-0. Epub 2022 Jul 6.
Visualization of a structure in orthogonal planes is essential for correct radiological assessment. The aim was to assess the utility of the standard MRI protocol for the shoulder in the assessment of the acromioclavicular joint (ACJ).
A total of 204 MRI scans of the shoulder were re-reviewed. Visibility of the ACJ in orthogonal planes was assessed, and the type of acromion and the angle between the ACJ and the glenoid cavity were assessed by two observers.
Agreement in the assessment of ACJ visibility was moderate to substantial. The ACJ was visible in the three anatomical views in 48% (confidence interval [CI] 95% = [41-54%]) of the examinations, and no significant difference regarding gender or age was noticed. The mean angle between the ACJ and the glenoid cavity was 41.12 deg. CI95% = (39.72, 42.53) in the axial plane, 33.39 deg. CI95% = (31.33, 35.45) in the coronal plane and 52.49 deg. CI95% = (50.10, 54.86) in the sagittal plane. When the ACJ was visible in the sagittal and axial planes, significant differences were noticed in the remaining planes (p < .05).
Anatomical variations of the ACJ influence its visibility in the standard MRI protocol for examining the shoulder, making this protocol insufficient for ACJ assessment in the examined population.
在正交平面上对结构进行可视化对于正确的放射学评估至关重要。本研究旨在评估标准 MRI 肩关节协议在评估肩锁关节（ACJ）中的作用。
对 204 例肩关节 MRI 扫描进行重新评估。评估正交平面中 ACJ 的可见性，由两名观察者评估肩峰的类型和 ACJ 与关节盂腔之间的角度。
ACJ 可见性评估的一致性为中度至高度一致。在 48%（95%CI 置信区间[41-54%]）的检查中，ACJ 在三个解剖视图中可见，且性别或年龄无显著差异。ACJ 与关节盂腔之间的平均角度在轴位为 41.12°，95%CI 置信区间为[39.72，42.53]；冠状位为 33.39°，95%CI 置信区间为[31.33，35.45]；矢状位为 52.49°，95%CI 置信区间为[50.10，54.86]。当 ACJ 在矢状面和轴位可见时，在其他平面上观察到显著差异（p<.05）。
ACJ 的解剖变异影响其在肩关节标准 MRI 协议中的可见性，使得该协议在检查人群中不足以评估 ACJ。
