Jin Hwan Ahn, Soo Jae Yim, Yu Seok Seo, Taeg Su Ko, Joon Hee Lee 

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The double flipped meniscus sign: Unusual MRI findings in bucket-handle tear of the lateral meniscus  Jin Hwan Ahn, Soo Jae Yim, Yu Seok Seo, Taeg Su Ko, Joon Hee Lee  The Knee  Volume 21, Issue 1, Pages 129-132 (January 2014) DOI: 10.1016/j.knee.2013.09.003 Copyright © 2013 The Authors Terms and Conditions

Fig. 1 MRI findings. (A) Coronal T2-weighted fat suppression MR image. The ‘fragment within the intercondylar notch sign’ depicting a large meniscal fragment (white arrow) displaced into the intercondylar notch and a reduced peripheral rim (black arrow). (B) Sagittal T2-weighted fat suppression MR image showing the ‘fragment within the intercondylar notch sign’ (white arrow). (C) Sagittal T2-weighted fat suppression MR image. The ‘double flipped meniscus sign’ appears as though there are three pieces of meniscus anterior horns (white circle). A decreased volume of the posterior horn was also detected (white arrow). The Knee 2014 21, 129-132DOI: (10.1016/j.knee.2013.09.003) Copyright © 2013 The Authors Terms and Conditions

Fig. 2 Arthroscopic findings. (A) Arthroscopic photograph of the intercondylar notch from the anterolateral portal. An incarcerated bucket-handle meniscus within the intercondylar notch was observed. (B) Arthroscopic photograph of the anterior compartment from the anterolateral portal. The double layer bucket-handle menisci were observed. (C) Arthroscopic photograph of the anterior compartment from the anterolateral portal. The peripheral fragment was reduced and the central fragment was observed to be intact in the anterior compartment. (D) Central bucket-handle fragment of the red–white zone after arthroscopic-assisted meniscectomy. (E). Arthroscopic photograph of the posterolateral compartment from the anteromedial portal. All-inside repairs were performed. (F) Arthroscopic photograph of the posterior compartment from the anteromedial portal. All-inside and inside-out repair were performed. Black arrow indicates inside-out repair. The Knee 2014 21, 129-132DOI: (10.1016/j.knee.2013.09.003) Copyright © 2013 The Authors Terms and Conditions