Magnetic Resonance Imaging Measurements of Maximum Thickness of Medial Meniscus Exceeding 10 mm Are Strongly Associated With Medial Meniscus Posterior Root Tear
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引用次数: 0
Abstract
Purpose
To evaluate the diagnostic utility of measuring the maximum thickness of the medial meniscus (MTMM) for detecting medial meniscus posterior root tear (MMPRT).
Methods
This retrospective study evaluated patients with medial meniscus (MM) injuries who underwent arthroscopic procedures between January 2018 and February 2024. Patients with concomitant lateral meniscal injuries, ligament injuries, or a history of knee trauma were excluded. MTMM was measured as the maximum vertical length in the coronal plane, identified by systematically measuring all slices using digital calipers on proton density-weighted fat-suppressed magnetic resonance imaging sequences. A reference group consisted of anterior cruciate ligament reconstruction patients with no meniscal injuries confirmed during arthroscopy. Statistical analyses were performed to examine the relationships between MTMM and meniscal injury patterns.
Results
The study included 35 MMPRT patients (mean age, 56.9 years), 138 other MM injuries (51.8 years), and 60 reference patients undergoing anterior cruciate ligament reconstruction (28.4 years). MTMM was significantly greater in the MMPRT group compared to other MM injuries (10.7 ± 1.5 mm vs 8.1 ± 1.4 mm, P < .05) and intact medial meniscus (7.1 ± 0.9 mm, P < .05). Receiver operating characteristic analysis identified an optimal cutoff value of 10.05 mm (sensitivity, 77.1%; specificity, 92.8%; area under the curve, 0.906). Based on this analysis, MTMM >10 mm was designated as the “thickened meniscus sign.” Twenty-seven of 35 MMPRT cases showed a positive thickened meniscus sign, while no cases in the reference group exceeded this threshold.
Conclusions
MTMM was significantly greater in MMPRT cases compared to other MM injuries. The thickened meniscus sign (MTMM >10 mm) had high diagnostic performance with 92.8% specificity, providing a simple and reliable screening tool for MMPRT detection.
目的：本研究的目的是评估测量内侧半月板（MTMM）最大厚度对检测内侧半月板后根撕裂（MMPRT）的诊断价值。方法：本回顾性研究评估了2018年1月至2024年2月期间接受关节镜手术的内侧半月板（MM）损伤患者。排除伴有外侧半月板损伤、韧带损伤或膝关节外伤史的患者。MTMM测量为冠状面上的最大垂直长度，通过使用数字卡尺在质子密度加权脂肪抑制MRI序列上系统测量所有切片来确定。参照组为经关节镜检查证实无半月板损伤的前交叉韧带重建患者。进行统计分析以检验MTMM与半月板损伤模式之间的关系。结果：该研究包括35例MMPRT患者（平均年龄56.9岁），138例其他MM损伤（51.8岁）和60例ACL重建的参考患者（28.4岁）。与其他MM损伤相比，MMPRT组的MTMM显著增加（10.7±1.5 MM vs 8.1±1.4 MM）， P10 MM被指定为“半月板增厚标志”。35例MMPRT病例中有27例显示阳性半月板增厚征象，而对照组中没有病例超过该阈值。结论：与其他MM损伤相比，MMPRT患者的MTMM明显增加。增厚半月板征（MTMM bbb10 mm）具有较高的诊断性能，特异性为92.8%，为MMPRT检测提供了一种简单可靠的筛查工具。证据等级：Ⅲ级，回顾性诊断研究。
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