Snapping Knee Caused by Medial Meniscal Cyst
Corresponding Author
Tsuyoshi Ohishi
Department of Orthopaedic Surgery, Enshu Hospital, 1-1-1 Chuo, Naka-ku, Hamamatsu, Shizuoka 430-0929, Japan
Search for more papers by this authorDaisuke Suzuki
Department of Orthopaedic Surgery, Enshu Hospital, 1-1-1 Chuo, Naka-ku, Hamamatsu, Shizuoka 430-0929, Japan
Search for more papers by this authorKazufumi Yamamoto
Department of Orthopaedic Surgery, Enshu Hospital, 1-1-1 Chuo, Naka-ku, Hamamatsu, Shizuoka 430-0929, Japan
Search for more papers by this authorTomohiro Banno
Department of Orthopaedic Surgery, Enshu Hospital, 1-1-1 Chuo, Naka-ku, Hamamatsu, Shizuoka 430-0929, Japan
Search for more papers by this authorHiroki Ushirozako
Department of Orthopaedic Surgery, Enshu Hospital, 1-1-1 Chuo, Naka-ku, Hamamatsu, Shizuoka 430-0929, Japan
Search for more papers by this authorYukihiro Matsuyama
Department of Orthopaedic Surgery, Hamamatsu University School of Medicine, Hamamatsu, Shizuoka 431-3192, Japan hama-med.ac.jp
Search for more papers by this authorCorresponding Author
Tsuyoshi Ohishi
Department of Orthopaedic Surgery, Enshu Hospital, 1-1-1 Chuo, Naka-ku, Hamamatsu, Shizuoka 430-0929, Japan
Search for more papers by this authorDaisuke Suzuki
Department of Orthopaedic Surgery, Enshu Hospital, 1-1-1 Chuo, Naka-ku, Hamamatsu, Shizuoka 430-0929, Japan
Search for more papers by this authorKazufumi Yamamoto
Department of Orthopaedic Surgery, Enshu Hospital, 1-1-1 Chuo, Naka-ku, Hamamatsu, Shizuoka 430-0929, Japan
Search for more papers by this authorTomohiro Banno
Department of Orthopaedic Surgery, Enshu Hospital, 1-1-1 Chuo, Naka-ku, Hamamatsu, Shizuoka 430-0929, Japan
Search for more papers by this authorHiroki Ushirozako
Department of Orthopaedic Surgery, Enshu Hospital, 1-1-1 Chuo, Naka-ku, Hamamatsu, Shizuoka 430-0929, Japan
Search for more papers by this authorYukihiro Matsuyama
Department of Orthopaedic Surgery, Hamamatsu University School of Medicine, Hamamatsu, Shizuoka 431-3192, Japan hama-med.ac.jp
Search for more papers by this authorAbstract
Snapping phenomenon around the medial aspect of the knee is rare. We present this case of snapping knee caused by the sartorius muscle over a large medial meniscal cyst in a 66-year-old female. Magnetic resonance images demonstrated a large medial meniscal cyst with a horizontal tear of the medial meniscus. Arthroscopic cyst decompression with limited meniscectomy resulted in the disappearance of snapping, and no recurrence of the cyst was observed during a 2-year follow-up period.
Supporting Information
Video 1: Snapping phenomenon on the medial aspect of left knee is shown. Hamstring tendons move on the medial mass with a snap during active flexion and extension in an arc of 30 to 60 degree of the knee.
Video 2: An overview of the arthroscopic procedure. Degenerative horizontal tear of the posterior segment of the medial meniscus is identified by probing. After resection of the torn meniscus through the anteromedial and anterolateral portals, a cleft between upper and lower leaf of the horizontally torn meniscus is clearly seen. A 16-gauge introducer needle is inserted to the cleft. Then, bloody viscous fluid gushes out. A small channel between cyst and joint is created and enlarged by a radiofrequency device.
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