Ahn Tae Young, Kim Hui Taek, Park Yong Geon
Division of Pediatric Orthopaedics, Department of Orthopaedic Surgery, Biomedical Research Institute, Pusan National University Hospital, Busan, South Korea.
JBJS Case Connect. 2018 Oct-Dec;8(4):e104. doi: 10.2106/JBJS.CC.18.00042.
We report the rare case of a double-layered lateral meniscus that was comprised of a normal meniscus and a ring-shaped accessory meniscus. An 11-year-old boy presented with left knee pain, and magnetic resonance imaging initially was interpreted as showing a horizontal meniscal tear. However, arthroscopic exploration revealed a double-layered meniscus. A superior accessory meniscus was fused with the inferior normal meniscus at the posterior horn and had more mobility compared with the normal meniscus. The symptoms improved substantially after resection of the superior accessory meniscus. The patient returned to sports at 4 months postoperatively; at 15 months postoperatively, radiographs demonstrated no evidence of degenerative changes.
A double-layered lateral meniscus that includes a ring-shaped accessory meniscus is a rare abnormality that can be corrected arthroscopically by resection of the accessory meniscus.
我们报告了一例罕见的双层外侧半月板病例，其由一个正常半月板和一个环形副半月板组成。一名11岁男孩因左膝疼痛就诊，磁共振成像最初被解读为显示水平半月板撕裂。然而，关节镜探查发现是双层半月板。一个上方副半月板在后角与下方正常半月板融合，且与正常半月板相比具有更大的活动度。切除上方副半月板后症状明显改善。患者术后4个月恢复运动；术后15个月，X线片显示无退变改变迹象。
包含环形副半月板的双层外侧半月板是一种罕见的异常情况，可通过关节镜下切除副半月板进行矫正。
