Knee Surgery, Sports Traumatology, Arthroscopy

, Volume 26, Issue 4, pp 1174–1181 | Cite as

Lateral meniscus posterior root tear contributes to anterolateral rotational instability and meniscus extrusion in anterior cruciate ligament-injured patients

  • Takao Minami
  • Takeshi Muneta
  • Ichiro Sekiya
  • Toshifumi Watanabe
  • Tomoyuki Mochizuki
  • Masafumi Horie
  • Hiroki Katagiri
  • Koji Otabe
  • Toshiyuki Ohara
  • Mai Katakura
  • Hideyuki Koga



The purposes of this study were to investigate (1) meniscus status and clinical findings in anterior cruciate ligament (ACL)-injured patients to clarify associations between the meniscus posterior root tear (PRT) and knee instability, and (2) magnetic resonance imaging (MRI) findings of the PRT to clarify sensitivity and specificity of MRI and prevalence of meniscus extrusion.


Three hundred and seventeen patients with primary ACL reconstruction were included. PRTs for both medial and lateral sides were confirmed by reviewing surgical records. Preoperative MRI was reviewed to evaluate sensitivity and specificity of the PRT and meniscus extrusion width (MEW). Clinical information regarding the number of giving-way episodes, preoperative KT-1000 measurements and preoperative pivot shift was also assessed.


Thirty-nine patients had a lateral meniscus (LM) PRT, whereas only four patients had a medial meniscus PRT. One hundred and seventeen patients had no meniscus tear (control). Twenty-eight patients (71.8%) showed positive signs of the LMPRT based on at least one view of MR images, with the coronal view showing the highest sensitivity. MEW in the LMPRT group was significantly larger than that in the control group. The preoperative pivot shift test grade in the LMPRT group was significantly greater than that in the control group. There were no significant differences in other parameters.


In ACL-injured patients, the LMPRT was associated with ALRI as well as with meniscus extrusion. The coronal view of MRI was useful in identifying the LMPRT, although its sensitivity was not high. Therefore, surgeons should prepare to repair PRTs at the time of ACL reconstruction regardless of MRI findings, and they should make every effort to repair the LMPRT.

Level of evidence



Anterior cruciate ligament Meniscus Posterior root tear Extrusion Knee instability 


Authors’ contributions

TMi analysed the data and drafted the manuscript. TMu conducted the study. IS conducted the study. TW, TMo, MH, HKa and MK collected the data. KO and TO analysed the data. HKo designed the initial plan, conducted the study and completed the final manuscript. All authors read and approved the final manuscript.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.


No funding was received for this study.

Ethical approval

This study was approved by the institutional Review Board in Tokyo Medical and Dental University (research protocol identification number: 1146).

Informed consent

All participants provided informed written consent.


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Copyright information

© European Society of Sports Traumatology, Knee Surgery, Arthroscopy (ESSKA) 2017

Authors and Affiliations

  • Takao Minami
    • 1
    • 2
  • Takeshi Muneta
    • 1
  • Ichiro Sekiya
    • 1
  • Toshifumi Watanabe
    • 1
  • Tomoyuki Mochizuki
    • 1
  • Masafumi Horie
    • 1
  • Hiroki Katagiri
    • 1
  • Koji Otabe
    • 1
  • Toshiyuki Ohara
    • 1
  • Mai Katakura
    • 1
  • Hideyuki Koga
    • 1
  1. 1.Department of Orthopaedic SurgeryTokyo Medical and Dental University Hospital of MedicineBunkyo-kuJapan
  2. 2.Department of Orthopaedic SurgeryWakayama Medical UniversityWakayama CityJapan

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