Mesgarzadeh M, Moyer R, Leder D S, Revesz G, Russoniello A, Bonakdarpour A, Tehranzadeh J, Guttmann D
Department of Diagnostic Imaging, Philadelphia, PA 19140.
Radiographics. 1993 May;13(3):489-500. doi: 10.1148/radiographics.13.3.8316659.
Findings from magnetic resonance (MR) imaging examinations of 194 knees were interpreted retrospectively with a new classification, including not only signal intensity but morphologic abnormalities. All findings were correlated with prospectively recorded results from arthroscopic examinations performed by a knee subspecialist. Meniscal MR imaging findings were expanded to eight types in this study. Positive predictive values for each type of finding and overall accuracy were calculated. Several potential sources of error that could be differentiated through pathologic change were recognized. Sensitivity and specificity of MR imaging findings were, respectively, 95% and 74% for the medial meniscus and 86% and 90% for the lateral meniscus. As the classification grade increased, the likelihood of meniscal tear also increased. Medial meniscal tears tended to occur in a predictable pattern, extending from the posterior to the anterior horn. Thus, when a definite tear of the body or anterior horn of the medial meniscus is present, a tear of the posterior horn should be suspected, even if the findings are not convincing. This expanded classification may be useful for radiologists in expressing their level of confidence in a particular MR imaging finding suggestive of meniscal injury.
对194例膝关节的磁共振（MR）成像检查结果进行了回顾性解读，采用了一种新的分类方法，该方法不仅包括信号强度，还包括形态学异常。所有结果均与膝关节专科医生进行的关节镜检查的前瞻性记录结果相关。在本研究中，半月板MR成像结果扩展为八种类型。计算了每种类型结果的阳性预测值和总体准确率。识别出了几种可通过病理变化区分的潜在误差来源。内侧半月板MR成像结果的敏感性和特异性分别为95%和74%，外侧半月板为86%和90%。随着分类等级的增加，半月板撕裂的可能性也增加。内侧半月板撕裂倾向于以可预测的模式发生，从后角延伸至前角。因此，当内侧半月板体部或前角出现明确撕裂时，即使结果不明确，也应怀疑后角撕裂。这种扩展的分类方法可能有助于放射科医生表达他们对提示半月板损伤的特定MR成像结果的置信程度。
