Experimental observation and clinical signiifcance of the snapping sign of the discoid lateral meniscus
YU Hong-wei
JI Bin-ping
KANG Yu-lu
MA Xiao-quan
Abstract：Objective To observe the snapping sign of the discoid lateral meniscus in the knee in MRI examination and under arthroscopy, and to explore the motion trail of the meniscus at the time of snapping knee syndrome and the clinical meaning.Methods A total of 12 discoid lateral menisci in 11 patients were examined. The knees were imaged in the sagittal plane before and after the appearance of snapping sign. The arthroscopic observation and meniscectomy were performed on 6 knees.Results Apparent differences between the abnormal motion of the discoid lateral meniscus and the motion of normal meniscus were noticed. During knee flexion, the discoid lateral meniscus moved anteriorly, but the normal meniscus moved posteriorly. Furthermore, with the knee extension, the discoid lateral meniscus instantly moved for a long distance from the posterior to the anterior at the time of snapping knee syndrome. The abnormal motion of the discoid meniscus could be eliminated in the arthroscopic meniscectomy. Conclusions For the patients with the discoid lateral meniscus but without meniscus injuries, arthroscopic meniscectomy should be performed. While the patients with the discoid lateral meniscus of abnormal motion and snapping sign should undergo surgical treatment in the early time.
Keywords：Knee jointCartilagearticularMagnetic resonance imaging(MRI)Arthroscopy
Publication Date：2014-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：4( 791-794 )