Miller T T, Staron R B, Feldman F, Cepel E
Department of Radiology, Columbia-Presbyterian Medical Center, New York, NY 10032, USA.
Skeletal Radiol. 1997 Jul;26(7):424-7. doi: 10.1007/s002560050259.
To determine the prevalence of meniscal protrusion (i.e. location of the outer edge of a meniscus beyond the tibial articular surface), and to determine its relationship with internal derangement, joint effusion, and degenerative arthropathy.
Sagittal and coronal MR images of 111 abnormal and 46 normal knees were evaluated for the presence of meniscal protrusion. We set 25% as the minimum amount of displacement considered abnormal because this was the smallest amount of displacement we could confidently discern. Presence of meniscal tear, anterior cruciate ligament (ACL) injury, joint effusion, or osteophytosis was also recorded.
Normal examinations demonstrated protrusion of the medial meniscus in 6.5% of sagittal images and 15% of coronal images, and of the lateral meniscus in 2% and 13%, respectively. Fisher's exact test demonstrated a statistically significant difference between the normal and abnormal groups for the medial meniscus on both sagittal (P < 0.0001) and coronal (P = 0.01) images, but not for the lateral meniscus in either plane (P > 0.2). A protruding medial meniscus was associated with effusion and osteophytosis (P < 0.05) but not with meniscal or ACL tear (P > 0.1). Posterior protrusion of the lateral meniscus was only associated with ACL injury (P < 0.0001); protruding anterior horns and bodies of lateral menisci were not associated with any of the four abnormalities. It is concluded that the medial meniscus may occasionally protrude more than 25% of its width, but protrusion is more often due to effusion and osteophytes. Protrusion of the posterior horn of the lateral meniscus is associated with ACL insufficiency, while protrusion of the body and anterior horn of the lateral meniscus is a normal variant.
确定半月板突出（即半月板外缘超出胫骨关节面的位置）的患病率，并确定其与关节内紊乱、关节积液和退行性关节病的关系。
对111例异常膝关节和46例正常膝关节的矢状面和冠状面磁共振成像（MR）进行半月板突出情况评估。我们将25%设定为被视为异常的最小移位量，因为这是我们能够可靠识别的最小移位量。同时记录半月板撕裂、前交叉韧带（ACL）损伤、关节积液或骨赘形成情况。
正常检查显示，在矢状面图像中，内侧半月板突出的比例为6.5%，在冠状面图像中为15%；外侧半月板在矢状面和冠状面图像中的突出比例分别为2%和13%。费舍尔精确检验显示，正常组与异常组在内侧半月板的矢状面（P < 0.0001）和冠状面（P = 0.01）图像上存在统计学显著差异，但在任一平面的外侧半月板上均无差异（P > 0.2）。内侧半月板突出与积液和骨赘形成相关（P < 0.05），但与半月板或ACL撕裂无关（P > 0.1）。外侧半月板后突仅与ACL损伤相关（P < 0.0001）；外侧半月板前角和体部突出与上述四种异常均无关。结论是，内侧半月板偶尔可能突出超过其宽度的25%，但突出更常见于积液和骨赘。外侧半月板后角突出与ACL功能不全相关，而外侧半月板体部和前角突出是正常变异。
