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First published online October 30, 2007
British Journal of Radiology (2008) 81, 20-24
© 2008 British Institute of Radiology
doi: 10.1259/bjr/66470309
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Anomalous insertion of the medial meniscus into the anterior cruciate ligament: the MR appearance

J-G Cha, MD1, K-D Min, MD, PhD2, J-K Han, MD3, H-S Hong, MD, PhD1, S-J Park, MD, PhD1, J-S Park, MD, PhD1 and S-H Paik, MD1

Departments of 1 Radiology and 2 Orthopedics, Soonchunhyang University Bucheon Hospital, 1174, Jung-dong, Wonmigu, Gyeonggi-do, 420-021 and 3 Department of Radiology, Soonchunhyang University Cheonan Hospital 23-20 Bongmyung-Dong, Cheonan-Si, Chungnam-Do, 330-721, Republic of Korea


Figure 1
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  		Figure 1. Schematic drawing of knee flexion from the anterior view shows the anomalous insertion of the medial meniscus(AIMM) anterior into the anterior cruciate ligament (ACL) as it courses from the anterior horn of the medial meniscus to the anterior aspect of the ACL.

 

Figure 2
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  		Figure 2. A 36-year-old male with acute knee injury. (a) Sagittal T2 weighted image of the left knee joint reveals an anomalous insertion of the medial meniscus (AIMM; arrows) attached to the middle portion of the. At the tibial attachment site of the AIMM, it mimics a tear of the anterior horn of the medial meniscus (arrowhead). (b) Sagittal T2 weighted image of the contralateral right knee joint also shows an AIMM with a high-signal-intensity gap between the AIMM (arrowheads) with the fan-shaped meniscal insertion (arrows). (c) The arthroscopy from the lateral portal view shows that the AIMM covers the anterior margin of the anterior cruciate ligament (ACL) in the left knee joint.

 

Figure 3
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  		Figure 3. A 19-year-old male with a sports injury. (a,b) Consecutive sagittal T2 weighted images show the anomalous insertion of the medial meniscus (AIMM; arrows) inserting from the anterior horn of the medial meniscus and attaching to the lower portion of the anterior cruciate ligament (ACL). (c,d) Arthroscopy from the anterior lateral views reveals the AIMM linked with the anterior horn medial meniscus (arrowheads). The AIMM can be separated from the ACL (arrows) by the hook.

 

Figure 4
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  		Figure 4. A 18-year-old male with pain in both knee joints. (a) Coronal proton density-weighted image reveals a medial discoid meniscus (arrows) in the right knee joint. (b) Sagittal T2 weighted image of the controlateral left knee joint shows the anomalous insertion of the medial meniscus (AIMM) inserting into the anterior horn of the medial meniscus (arrows). (c) Coronal T2 weighted image of the left knee joint demonstrates a lateral discoid meniscus (arrows).

 




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