Department of Radiology, Medical Faculty, Ataturk University, Erzurum, Turkey.
Anesthesiology, Clinical Research Office, Ataturk University, Erzurum, Turkey.
Br J Radiol. 2021 Jul 1;94(1123):20201230. doi: 10.1259/bjr.20201230. Epub 2021 May 14.
Pathologies of the posterior labrocapsular structures of the shoulder joint are far less common than anterior labrocapsuloligamentous lesions. Most of these pathologies have been associated with traumatic posterior dislocation. A smaller portion of the lesions include posterior extension of superior labral anteroposterior lesions, posterior superior internal impingement, and damage to the posterior band of the inferior glenohumeral ligament. Labrocapsular anatomic variations of the posterior shoulder joint can mimic labral pathology on conventional MR and occasionally on MR arthrographic images. Knowledge of this variant anatomy is key to interpreting MR images and studying MR arthrography of the posterior labrocapsular structure to avoid misdiagnosis and unnecessary surgical procedures. In this article, we review normal and variant anatomy of the posterior labrocapsular structure of the shoulder joint based on MR arthrography and discuss how to discriminate normal anatomic variants from labrocapsular damage.
肩关节后囊及肩袖结构的病变比前囊及肩袖病变少见得多。这些病变大多与创伤性后脱位有关。病变的一小部分包括上盂唇前后向病变的后延伸、后上内撞击和下盂肱韧带后束的损伤。肩关节后囊的盂唇解剖变异在常规磁共振成像上，偶尔在磁共振关节造影图像上可模拟盂唇病变。了解这种变异解剖结构是解读磁共振图像和研究盂唇后囊结构磁共振关节造影的关键，以避免误诊和不必要的手术。本文通过磁共振关节造影，回顾肩关节后囊及肩袖结构的正常和变异解剖，并讨论如何区分正常解剖变异与盂唇损伤。
