Magnetic resonance imaging of anterior cruciate ligament (ACL) tears: Diagnostic value of ACL-tibial plateau angle
Magnetic resonance imaging of anterior cruciate ligament (ACL) tears: Diagnostic value of ACL-tibial plateau angle
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前交叉韧带（ACL）撕裂的磁共振成像：ACL-胫骨平台角的诊断价值
DOI：
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发表时间：
1998
影响因子：
1.7
通讯作者：
M. Abe
中科院分区：
文献类型：
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作者：
H. Murao;S. Morishita;M. Nakajima;M. Abe
摘要：前交叉韧带（ACL）撕裂通常难以在磁共振成像（MRI）上诊断，因为它通常难以解释图像。我们开发了一种定量诊断前交叉韧带撕裂的MRI方法；该方法包括测量MRI上沿前交叉韧带前缘绘制的直线与沿胫骨平台内侧绘制的直线（AT角）相交形成的角度。AT角度由两名经日本骨科协会认可的骨科医生和一名骨科住院医师测量，他们都不了解患者的身体和关节镜检查结果。测量了30个有前交叉韧带撕裂的膝盖和57个没有撕裂的膝盖。在前交叉韧带撕裂组和未前交叉韧带撕裂组中，三名检查者测量的AT角度无显著差异。ACL撕裂组AT角平均值（33.9±1.1度）明显小于完整ACL组（52.3±1.0度，平均值±SE）。以45度以下为前交叉韧带撕裂的诊断标准，诊断准确率为87.4%；敏感性为93.3%，特异性为84.2%。
Abstract: Tears of the anterior cruciate ligament (ACL) are often difficult to diagnose on magnetic resonance imaging (MRI), as it is often difficult to interpret the images. We developed a quantitative method for diagnosing ACL tears on MRI; the method involves measuring the angle formed by the intersection between a straight line drawn along the anterior border of the ACL and a straight line drawn along the medial tibial plateau (AT angle) on MRI. The AT angle was measured by two orthopedic surgeons approved by the Japanese Orthopedic Association and one orthopedic resident, none of whom had any prior knowledge of the physical and arthroscopic findings of the patients. Measurements were performed in 30 knees with ACL tears and 57 knees without tears. There was no significant difference between the AT angles measured by the three examiners in either the group with ACL tears or that without ACL tears. The mean value of the AT angle in the torn ACL group (33.9 ± 1.1 degrees) was significantly smaller than that in the intact ACL group (52.3 ± 1.0 degrees; mean ± SE). When 45 degrees or less was set as the criterion defining a tear of the ACL, the diagnostic accuracy of our method was 87.4%; sensitivity was 93.3%, and specificity, 84.2%.