SCDU Radiologia, A.O.U. Maggiore della Carità di Novara, Corso Mazzini 18, 28100, Novara, Italy,
Radiol Med. 2013 Dec;118(8):1335-43. doi: 10.1007/s11547-013-0927-x. Epub 2013 May 27.
Computed tomography (CT) is the gold standard for evaluating glenoid bone loss in patients with glenohumeral dislocations. The aim of this study was to verify if magnetic resonance imaging (MRI) can quantify the area of bone loss without any significant difference from CT.
Twenty-three patients, who had experienced one or more post-traumatic unilateral glenohumeral dislocations, underwent MRI and CT. MR and multiplanar reconstruction CT images were acquired in the sagittal plane: the glenoid area and the area of bone loss were calculated using the PICO method. Mean values, percentages, Cohen's kappa coefficients and Bland-Altman plots were all used to confirm the working hypothesis.
The mean glenoid surface area was 575.29 mm(2) as measured by MRI, and 573.76 mm(2) as measured by CT; the calculated mean glenoid bone loss was respectively 4.38% and 4.34%. The interobserver agreement was good (k>0.81), and the coefficient of variance was 5% of the mean value using both methods. The two series of measurements were within two standard deviations of each other.
MRI is a valid alternative to CT for measuring glenoid bone loss in patients with glenohumeral dislocation.
计算机断层扫描（CT）是评估肩关节脱位患者盂骨骨量丢失的金标准。本研究旨在验证磁共振成像（MRI）是否可以定量测量骨量丢失，而与 CT 相比无任何显著差异。
23 名单侧创伤性肩关节脱位患者接受了 MRI 和 CT 检查。在矢状面采集 MRI 和多平面重建 CT 图像：使用 PICO 方法计算盂骨面积和骨量丢失面积。使用平均值、百分比、Cohen's kappa 系数和 Bland-Altman 图来确认工作假设。
MRI 测量的平均盂骨表面积为 575.29mm²，CT 测量的为 573.76mm²；计算的平均盂骨骨量丢失分别为 4.38%和 4.34%。两种方法的观察者间一致性均良好（k>0.81），方差系数分别为两种方法平均值的 5%。两种系列测量值彼此之间相差在两个标准差范围内。
MRI 是一种替代 CT 测量肩关节脱位患者盂骨骨量丢失的有效方法。
