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Does discoid lateral meniscus have inborn peripheral rim instability? Comparison between intact discoid lateral meniscus and normal lateral meniscus

  • Jae Hyan Kim
  • Seong-Il Bin
  • Bum-Sik Lee
  • Jong-Min Kim
  • Nam-Ki Kim
  • Chang-Rack Lee
Arthroscopy and Sports Medicine
  • 64 Downloads

Abstract

Introduction

Little is known about peripheral rim instability (PRI) of adult discoid lateral meniscus (DLM). We compared PRI of the intact DLM (iDLM) to those of intact normal lateral meniscus (LM) in adult patients and also investigated whether there was any association between PRI and DLM tears.

Materials and methods

We investigated PRI in 17 DLMs and 60 normal LMs without tears during arthroscopic surgery for medial compartmental pathologies between June 2012 and October 2015. We also investigate PRI of torn DLM (tDLM) excluding peripheral tear to compare the PRI between intact and torn DLM. Stability parameters were measured using a probing hook and arthroscopic ruler at the anterior, middle, and posterior parts of the peripheral rim of the menisci: translating the anterior horn (AH) and mid-body (MB) and lifting the posterior horn (PH).

Results

AH and PH instabilities were greater in the iDLM group than in the iLM group (2.2 ± 1.4 vs. 0.9 ± 1.4 mm, p = 0.006 and 3.4 ± 1.7 vs. 1.7 ± 1.2 mm, p = 0.004, respectively). However, there was no significant difference in MB instability between two groups. In addition, no significant difference was observed in all the parameters between the iDLM and tDLM groups.

Conclusion

Both iDLM and tDLM had greater PRI of the AH and PH than the iLM in adult patients. Thus, the DLM is prone to tear and careful inspection is needed not to overlook PRI of a DLM even if the peripheral attachment is intact.

Level of evidence

Level 3, comparative study of anatomical instability of living subjects.

Keywords

Discoid lateral meniscus Instability Arthroscopy Meniscal tear 

Notes

Funding

There is no funding source.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

Ethical approval

This article does not contain any studies with human participants or animals performed by any of the authors.

Informed consent

Informed consent was obtained from all individual participants included in the study.

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Department of Orthopedic SurgeryBaroseum HospitalDaejeonSouth Korea
  2. 2.Department of Orthopedic Surgery, Asan Medical CenterUniversity of Ulsan College of MedicineSeoulSouth Korea
  3. 3.Department of Orthopedic SurgeryIncheon Red Cross HospitalIncheonSouth Korea
  4. 4.Department of Orthopedic SurgeryInje University Busan Paik HospitalBusanSouth Korea

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