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

  • Arthroscopy and Sports Medicine
  • Published:
Archives of Orthopaedic and Trauma Surgery Aims and scope Submit manuscript

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.

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Authors and Affiliations

  1. Department of Orthopedic Surgery, Baroseum Hospital, Daejeon, South Korea

    Jae Hyan Kim

  2. Department of Orthopedic Surgery, Asan Medical Center, University of Ulsan College of Medicine, 88, Olympic-Ro 43-Gil, Songpa-Gu, Seoul, 138-736, South Korea

    Seong-Il Bin, Bum-Sik Lee & Jong-Min Kim

  3. Department of Orthopedic Surgery, Incheon Red Cross Hospital, Incheon, South Korea

    Nam-Ki Kim

  4. Department of Orthopedic Surgery, Inje University Busan Paik Hospital, Busan, South Korea

    Chang-Rack Lee

Authors
  1. Jae Hyan Kim
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  2. Seong-Il Bin
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  3. Bum-Sik Lee
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  4. Jong-Min Kim
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  5. Nam-Ki Kim
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Correspondence to Seong-Il Bin.

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

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

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Kim, J.H., Bin, SI., Lee, BS. et al. Does discoid lateral meniscus have inborn peripheral rim instability? Comparison between intact discoid lateral meniscus and normal lateral meniscus. Arch Orthop Trauma Surg 138, 1725–1730 (2018). https://doi.org/10.1007/s00402-018-2987-9

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  • DOI: https://doi.org/10.1007/s00402-018-2987-9

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