Fujii Masataka, Furumatsu Takayuki, Miyazawa Shinichi, Tanaka Takaaki, Inoue Hiroto, Kodama Yuya, Ozaki Toshifumi
Department of Orthopaedic Surgery, Okayama University, Graduate School of Medicine, Dentistry, and Pharmaceutical Sciences, 2-5-1 Shikata-cho, Kita-ku, Okayama 700-8558, Japan.
Department of Orthopaedic Surgery, Okayama University, Graduate School of Medicine, Dentistry, and Pharmaceutical Sciences, 2-5-1 Shikata-cho, Kita-ku, Okayama 700-8558, Japan.
Int J Surg Case Rep. 2017;31:229-232. doi: 10.1016/j.ijscr.2017.01.060. Epub 2017 Jan 30.
We presented the first case in the literature of inter-horn bridge formation involved in ring-shaped lateral meniscus after anterior cruciate ligament (ACL) reconstruction.
A 22-year-old man underwent anatomic double-bundle ACL reconstruction using semitendinosus tendon autograft. At the surgery, the lateral meniscus showed a normal appearance without meniscal tears and had no instability. There were no meniscal anomalies such as discoid meniscus and ring-shaped meniscus. Magnetic resonance image examination was performed before second-look arthroscopy at 1 year postoperatively. A coronal plane showed a small triangular fragment located at the medial border of the lateral tibial plateau. An axial plane demonstrated a ring-shaped lateral meniscus. On second-look arthroscopy, there was a meniscus-like tissue formation that connected the anterior horn to the posterior horn of the lateral meniscus at the lateral intercondylar tubercle.
Ring-shaped meniscus is an extremely rare malformation of the meniscus. Our hypothesis was that drilling debris and remaining remnant of ACL might induce a scar tissue formation.
This is the first case in the literature of inter-horn bridge formation involved in ring-shaped lateral meniscus following ACL reconstruction.
我们报道了文献中首例前交叉韧带（ACL）重建术后环形外侧半月板内出现角间桥形成的病例。
一名22岁男性接受了使用半腱肌自体移植物的解剖双束ACL重建术。手术中，外侧半月板外观正常，无半月板撕裂且无不稳定情况。不存在盘状半月板和环形半月板等半月板异常。术后1年进行二次关节镜检查前进行了磁共振成像检查。冠状面显示一个小三角形碎片位于外侧胫骨平台的内侧边缘。轴位显示一个环形外侧半月板。二次关节镜检查时，在外侧髁间结节处有一个半月板样组织形成，连接外侧半月板的前角和后角。
环形半月板是一种极其罕见的半月板畸形。我们的假设是钻孔碎屑和ACL的残留可能会诱导瘢痕组织形成。
这是文献中首例ACL重建术后环形外侧半月板内出现角间桥形成的病例。
