Magnetic Resonance Imaging of the Subcoracoid Region and Its Relationship with Subscapularis Lesions in the Chinese Population: 在中國人群組中用磁力共振來評估下喙突區域及其與肩胛下肌病變的關係

IntroductionCoracoid impingement is considered a known yet frequently overlooked cause of anterior shoulder pain. Subcoracoid stenosis has been shown to be related to subscapularis tear. Studies have shown that patients with coracoid impingement have a shorter coracohumeral distance (CHD) and a larger coracoid overlap (CO) but these are based on data from Western populations. The aim of our study was to provide a local database on the MRI measurement of these parameters in our Chinese population and raise the awareness of this disease entity.MethodsAll the shoulder MRI films taken in our hospital in 2011 were retrospectively reviewed and classified into two cohorts. The control group consisted of patients who had no subscapularis lesion. The subscapularis lesion group consisted of patients with complete tear, partial tear or abnormal signal over the subscapularis tendon. The CHD and CO were measured.ResultsWe reviewed 133 sets of shoulder MRI obtained in our hospital during 2011. Thirteen patients were noted to have subscapularis lesion. The CHD in the subscapularis lesion group was 6.24 ± 2.18 mm. The CHD in the control group was 9.95 ± 3.9 mm. Women had shorter CHD (8.18 ± 2.57 mm) than men (11.0 ± 4.54 mm). We failed to notice any statistically significant difference with regards to CO, coracoid process and lesser tuberosity morphology between the two groups of patients.ConclusionMRI assessment of CHD can be useful in identifying patients at risk of having subscapularis lesion and coracoids impingement.

中 文 摘 要引言喙突夾擠是一種已知可引起前肩關節痛，卻又時常錯過的病因。喙突狹窄已顯示與肩胛下肌撕裂有關係。有研究表明，喙突夾擠患者擁有較短的喙突肱骨距離和更大的喙突重疊，但這些都是根據來自西方人口的數據。我們研究的目的，是提供在我們中國人群組中相關磁力共振參數的測量，提高對本病的認知。方法我們回顧在2011年，於我們的醫院所進行的肩膀磁力共振掃瞄進行分析，並為兩個組別。對照組包括沒有肩胛下肌病變的病人，而肩胛下病變組包括患有肩胛下肌肌腱完全撕裂，部分撕裂或掃瞄顯示異常信號的病人。我們為相關的喙突肱骨距離和喙突重疊進行了測定。結果我們回顧了133套在我們醫院做的肩膀磁力共振掃瞄。 13例患者有肩胛下肌病變。肩胛下肌病變組的喙突肱骨距離是6.24 ± 2.18毫米。對照組中的喙突肱骨距離是9.95 ± 3.9毫米。女性擁有比男性短的喙突肱骨距離（8.18 ± 2.57毫米 對比11.0 ± 4.54毫米）。兩組患者之間的喙突重疊、喙突形狀和小結節形狀都沒有發現有任何統計學上顯著差異。結論用肩膀磁力共振掃瞄來評定喙突肱骨距離，是有效來識別肩胛下肌病變和喙突夾擠患者的方法。