Are the Current Size Options of Glenoid Baseplates for Reverse Shoulder Arthroplasty Sufficient for our Local Population?: 現有反置式人工肩關節置換術中盂底板組件的大小選項是否滿足我們本地人口的需要？

Background/PurposeReverse shoulder arthroplasty (RSA) is an effective treatment for patients who suffer from shoulder pain and dysfunction associated with a variety of shoulder pathologies including severe rotator cuff deficiency with or without glenohumeral arthritis. It has been widely used in European countries and the United States and is now gaining popularity in Asia, including Hong Kong. However, there are only limited size options available for glenoid baseplates, with 25 mm being the smallest size in some commonly used systems. The aim of our study is to perform computerized tomography (CT) measurements of the glenoid dimension in the Chinese population and to see if the current glenoid baseplate component size option is sufficient for our local population.MethodsA total of 70 CT scans of shoulder regions were analysed. Measurements included maximum superoinferior height and the anteroposterior height.ResultsThe glenoid dimensions were smaller compared to those from previous studies in Caucasian counterparts. Some 41% of female glenoids had widths measuring < 25 mm (25 mm being the smallest size available in some commonly used RSA systems).ConclusionAlthough there are only limited size options available for the glenoid baseplate in RSA, from our data, it should be able to cover most patients in our local population. However, surgeons should exercise special care when contemplating performing reverse shoulder replacement for small size females in our local population.

中 文 摘 要簡介反置式人工肩關節置換術（reverse shoulder arthroplasty, RSA）是一種有效治療由各種肩關節病症所引起的肩膀疼痛和功能障礙，包括嚴重肩袖缺損，或伴隨有盂肱關節炎等。在歐洲國家和美國，它已被廣泛應用，在亞洲包括香港也越來越受歡迎。然而，盂底板組件大小的選擇有限，在常用的系統中最小尺寸為25mm。我們研究的目的，是用電腦掃瞄器來測量在本地中國人中肩關節盂的大小，並查看現有盂底板組件尺寸的選擇是否滿足我們的本地居民的需要。方法我們分析了70組肩部區域的電腦掃描。測量包括肩關節盂最大上下高度和前後長度。結果我們的結果和其他從高加索人種所作的研究作比較，發現本地中國人的肩關節盂尺寸較小。有41％的女性肩關節盂寬度小於25毫米（25毫米是在一些常用的RSA系統中可用的最小尺寸盂底板組件）。討論和結論雖然盂底板組件大小的選擇有限，從我們的數據，現有的盂底板組件應該能夠覆蓋大多數我們本地的患者。然而，基於我們本地女性居民肩關節盂的尺寸較小，外科醫生有進行反置式人工肩關節置換術時，應該特別留意。