Smith D K, Totty W G
Mallinckrodt Institute of Radiology, St Louis, MO 63110.
Radiology. 1990 Jul;176(1):141-4. doi: 10.1148/radiology.176.1.2353083.
The magnetic resonance (MR) examinations of 51 menisci treated by means of partial meniscectomy were reviewed. Menisci were divided into three groups: group 1, near normal length without osteoarthritis; 2, substantially shortened without osteoarthritis; and 3, any length with osteoarthritis. Group 1 menisci resembled normal menisci except for mild shortening and frequent signal inhomogeneity (56%). Group 2 menisci varied in appearance, with marked contour irregularity simulating fragmentation in 40% of segments despite a normal postoperative appearance at follow-up arthroscopy. Group 3 menisci appeared similar to menisci of the same length without osteoarthritis. Arthroscopic correlation, available for 23 menisci (45%), confirmed the MR diagnosis of a tear in 11 and no tear in 49 and revealed an unsuspected tear in three meniscal segments. There is a spectrum of normal MR appearances after partial meniscectomy. Standard MR criteria can be used to diagnose tears in the absence of marked contour irregularity; however, the diagnosis of tears of segments with marked contour irregularity must be made cautiously, since this irregularity can mimic a tear and was not predictive of an arthroscopically visible tear.
回顾了51例接受半月板部分切除术治疗的半月板的磁共振（MR）检查结果。半月板被分为三组：第1组，长度接近正常且无骨关节炎；第2组，明显缩短且无骨关节炎；第3组，有骨关节炎，长度不限。第1组半月板除了轻度缩短和频繁的信号不均匀（56%）外，与正常半月板相似。第2组半月板外观各异，40%的节段有明显的轮廓不规则，类似碎裂，尽管在随访关节镜检查时术后外观正常。第3组半月板与相同长度但无骨关节炎的半月板外观相似。对23个半月板（45%）进行了关节镜检查对照，证实MR诊断有撕裂的11个，无撕裂的49个，并在三个半月板节段中发现了意外撕裂。半月板部分切除术后存在一系列正常的MR表现。在没有明显轮廓不规则的情况下，标准的MR标准可用于诊断撕裂；然而，对于有明显轮廓不规则的节段的撕裂诊断必须谨慎，因为这种不规则可能会模拟撕裂，而且并不能预测关节镜下可见的撕裂。
