Atrophy and fatty infiltration of the supraspinatus muscle: Sonography versus MRI
Atrophy and fatty infiltration of the supraspinatus muscle: Sonography versus MRI
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DOI：
10.2214/ajr.07.2835
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发表时间：
2008-04-01
影响因子：
5
通讯作者：
Brassard, Paul
中科院分区：
文献类型：
--
作者：
Khoury, Viviane;Cardinal, Etienne;Brassard, Paul
目标。我们研究的目的是比较超声与MRI对冈上肌萎缩和脂肪浸润的评价。研究对象和方法。39例接受肩关节MRI评估肩袖疾病的患者中的45例肩关节采用超声盲目评估。通过计算占据比（冈上肌腹部横截表面积除以冈上肌窝横截表面积）定量评估冈上肌萎缩。这是通过在超声上复制相当于MRI上的“Y”视图来完成的。通过比较冈上肌、斜方肌和矢状肌回声特征来评估脂肪浸润。比较超声对冈上肌的占位率和脂肪浸润情况。超声图像计算的占位比范围从0.07（严重萎缩）到0.81（正常），并与MRI计算的占位比相关（R = 0.90; 95% CI, 0.83-0.95）。MRI未见脂肪浸润的20个肩部回声正常，超声呈pennate型。10例MRI轻度脂肪浸润肩关节中，有8例在超声上表现为淡薄的矢状影和轻度高回声。在MRI上有中度至重度脂肪浸润的15例肩关节中，有13例肩关节未见矢状影，超声表现为明显的高回声。我们的研究提示超声和MRI在评估冈上肌萎缩和脂肪浸润方面有很好的相关性。
OBJECTIVE. The objective of our study was to compare sonography with MRI for the evaluation of supraspinatus muscle atrophy and fatty infiltration.SUBJECTS AND METHODS. Forty-five shoulders in 39 patients who had undergone shoulder MRI for the assessment of rotator cuff disease were evaluated blindly with sonography. Supraspinatus muscle atrophy was quantitatively assessed by calculating the occupation ratio (cross-sectional surface area of the supraspinatus muscle belly divided by that of its fossa). This was done by reproducing on sonography the equivalent of the "Y" view on MRI. Fatty infiltration was assessed by evaluating supraspinatus muscle echogenicity compared with that of the trapezius muscle and pennate pattern. The occupation ratio and fatty infiltration of the supraspinatus muscle on sonography were compared with these findings on MRI.RESULTS. Occupation ratios calculated on sonography images ranged from 0.07 (severe atrophy) to 0.81 (normal) and correlated with the ratios calculated on MRI (R = 0.90; 95% CI, 0.83-0.95). All 20 shoulders with no fatty infiltration on MRI had normal echogenicity and a pennate pattern on sonography. Eight of the 10 shoulders with mild fatty infiltration on MRI had an effaced pennate pattern and mild hyperechogenicity on sonography. In 13 of the 15 shoulders with moderate to severe fatty infiltration on MRI, the pennate pattern was absent and marked hyperechogenicity was present on sonography.CONCLUSION. Our study suggests that there is a good correlation between sonography and MRI for the assessment of supraspinatus muscle atrophy and fatty infiltration.