Complete tear of the lateral meniscus posterior root is associated with meniscal extrusion in anterior cruciate ligament deficient knees

Yusuke Kamatsuki, Takayuki Furumatsu, Masataka Fujii, Yuya Kodama, Shinichi Miyazawa, Tomohito Hino, Toshihumi Ozaki

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6 Citations (Scopus)


This study aimed to evaluate the relationship between preoperative lateral meniscal extrusion (LME) and arthroscopic findings of lateral meniscus posterior root tear (LMPRT) in knees with anterior cruciate ligament (ACL) tear. Thirty-five knees that had LMPRTs with concomitant ACL tears on arthroscopy were evaluated. Patients were divided into two groups, partial and complete root tears, via arthroscopic findings at the time of ACL reconstruction. For comparison, we added two groups, using the same database; 20 normal knees (normal group) and 20 ACL-injured knees without LM injury (intact LM group). We retrospectively measured preoperative LMEs using magnetic resonance imaging (MRI). Twenty-three knees had partial LMPRTs. Complete LMPRTs were observed in 12 knees. The average LME was -0.1±0.4mm in the normal group, 0.2±0.5mm in the intact LM group, 0.4±0.8mm in the partial LMPRT group, and 2.0±0.6mm in the complete LMPRT group. A significant difference in preoperative LMEs was observed between the complete LMPRT group and the other groups (p<0.001). The receiver operating curve analysis, which distinguishes a partial tear from a complete tear, identified an optimal cut-off point of 1.1mm for preoperative LME. This LME cut-off had a sensitivity of 100% and specificity of 83% for complete LMPRT. We found that preoperative LMEs were larger in complete LMPRTs associated with ACL injuries than in partial LMPRTs. Our results suggest that preoperative MRI-detected LME may be a useful indicator for estimating LMPRT severity in ACL-injured knees. Level of evidence: Retrospective comparative study level IV.

Original languageEnglish
JournalJournal of Orthopaedic Research
Publication statusAccepted/In press - Jan 1 2018



  • Anterior cruciate ligament
  • Lateral meniscus
  • Magnetic resonance imaging
  • Meniscal extrusion
  • Posterior root tear

ASJC Scopus subject areas

  • Orthopedics and Sports Medicine

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