Breitenseher M J, Trattnig S, Dobrocky I, Kukla C, Nehrer S, Steiner E, Imhof H
Department of Radiology, University of Vienna, Austria.
Acta Radiol. 1997 Sep;38(5):876-9. doi: 10.1080/02841859709172428.
The aim of this study was to establish diagnostic criteria for meniscal subluxation, and to determine whether there was any connection between meniscal subluxation and other common meniscal and knee-joint abnormalities.
The normal position of the meniscal body was assessed in 10 asymptomatic volunteers. MR signs of meniscal subluxation were evaluated retrospectively in 60 symptomatic patients with pain in the knee, impaired mobility, and/or joint swelling who had no clear diagnosis after the evaluation of case history, clinical examination, and radiography. The criterion for subluxation of the meniscus was defined as a distance of > or = 3 mm between the peripheral border of the meniscus and the edge of the tibial plateau.
In the volunteers, the mean distance from the medial meniscus to the edge of the tibial plateau was 0.07 mm, and that from the lateral meniscus was 0 mm. In 55 symptomatic patients without meniscal subluxation, the mean distance from the meniscus to the edge of the tibial plateau was 0.27 mm. Five patients (8%) had evidence of meniscal subluxation, 4 in the medial meniscus and one in the lateral meniscus. The most commonly associated knee abnormality was joint effusion in 5 knees and osteoarthritis in 2 knees.
Meniscal subluxation was not a rare finding with MR imaging in patients with painful knees. Meniscal subluxation was associated with other knee abnormalities such as joint effusion or osteoarthritis.
本研究旨在建立半月板半脱位的诊断标准，并确定半月板半脱位与其他常见半月板及膝关节异常之间是否存在关联。
对10名无症状志愿者的半月板本体正常位置进行评估。对60例有膝关节疼痛、活动受限和/或关节肿胀症状且经病史评估、临床检查及影像学检查后仍未明确诊断的患者，回顾性分析其半月板半脱位的磁共振成像（MR）征象。半月板半脱位的标准定义为半月板外周缘与胫骨平台边缘之间的距离≥3 mm。
在志愿者中，内侧半月板至胫骨平台边缘的平均距离为0.07 mm，外侧半月板为0 mm。在55例无半月板半脱位的有症状患者中，半月板至胫骨平台边缘的平均距离为0.27 mm。5例患者（8%）有半月板半脱位迹象，其中内侧半月板4例，外侧半月板1例。最常见的相关膝关节异常为5例关节积液和2例骨关节炎。
在膝关节疼痛患者中，半月板半脱位在MR成像中并非罕见发现。半月板半脱位与其他膝关节异常如关节积液或骨关节炎有关。
