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Two positioned MRI can visualize and detect the location of peripheral rim instability with snapping knee in the no-shift-type of complete discoid lateral meniscus

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

Abstract

Introduction

We evaluated the efficacy of two positioned magnetic resonance imaging (MRI) for visualizing the snapping phenomenon and detecting peripheral rim instability (PRI) in no-shift-type complete discoid lateral meniscus (CDLM).

Materials and methods

The records of 39 patients diagnosed with no-shift-type CDLM under routine MRI who underwent arthroscopic surgery were reviewed. The snapping phenomenon and meniscal shift on two positioned MRI in full extension and deep flexion were evaluated and calculated the agreement between these findings. The positive predictive value (PPV), sensitivity, and specificity of meniscal shift on two positioned MRI for predicting PRI were calculated; PRI was further investigated according to anterior and posterior location. The hypotheses of this study were asfollows: (1) Two positioned MRI can visualize the snapping phenomenon and (2) Meniscal shift on two positioned MRI is an important predictive sign of detecting the instability site in no-shift-type CDLM.

Results

The κ values between the snapping phenomenon and meniscal shift on two positioned MRI were 0.84. The snapping and two positioned MRI findings had high PPV (1.0, 0.96), sensitivity (0.82, 0.85), and specificity (1.0, 0.91) for predicting overall PRI. For anterior PRI, the snapping and posterior shift on two positioned MRI had moderate and high PPV (0.78, 0.9), high sensitivity (0.9, 0.9), and specificity (0.8, 0.89). The anterior shift on two positioned MRI findings predicted posterior PRI with high PPV (1.0) and specificity (1.0).

Conclusions

Two positioned MRI visualized the snapping phenomenon. Meniscal shift on two positioned MRI was an important predictive sign of overall PRI, anterior PRI, and posterior PRI in no-shift-type CDLM.

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Acknowledgements

We thank Jane Charbonneau, DVM, from Edanz Group (https://en-authorservices.edanzgroup.com/) for editing a draft of this manuscript.

Funding

No funding was received to assist with the preparation of this manuscript.

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Authors and Affiliations

  1. Department of Orthopaedic Surgery, Osaka City University Graduate School of Medicine, 1-4-3 Asahi-machi, Abeno-ku, Osaka, 545-8585, Japan

    Yusuke Hashimoto, Kazuya Nishino, Yohei Nishida, Shinji Takahashi & Hiroaki Nakamura

  2. Department of Orthopaedic Surgery, Osaka City General Hospital, 2-13-22 Miyakojima-hondori, Miyakojima-ku, Osaka, 534-0021, Japan

    Shinya Yamasaki

Authors
  1. Yusuke Hashimoto
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  2. Kazuya Nishino
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  4. Yohei Nishida
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  5. Shinji Takahashi
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  6. Hiroaki Nakamura
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Contributions

YH: Conception and design. Drafting of the article. KN: Drafting of the article, and acquisition of the data. SY: revised the work critically for important intellectual content. YN: Interpretation of data. ST: analysis of the data. HN: Conception and design, final approval of the article. All authors read and approved the final manuscript.

Corresponding author

Correspondence to Yusuke Hashimoto.

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The authors declare that they have no conflict of interest.

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Institutional Review Board/Ethics Committee approval number: 2968.

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

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Hashimoto, Y., Nishino, K., Yamasaki, S. et al. Two positioned MRI can visualize and detect the location of peripheral rim instability with snapping knee in the no-shift-type of complete discoid lateral meniscus. Arch Orthop Trauma Surg 142, 1971–1977 (2022). https://doi.org/10.1007/s00402-021-04148-9

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  • DOI: https://doi.org/10.1007/s00402-021-04148-9

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