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A posterior shiny-corner lesion of the tibia is observed in the early phase after medial meniscus posterior root tear

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European Journal of Orthopaedic Surgery & Traumatology Aims and scope Submit manuscript

Abstract

Backgrounds

Medial meniscus (MM) posterior root tear (PRT) results in joint overloading and degenerative changes in the knee, and pullout repair is recommended to prevent subsequent osteoarthritis. Diagnosing MMPRT is sometimes difficult, especially in the case of an incomplete tear. A posterior shiny-corner lesion (PSCL) is reported to be useful for diagnosis, although the association between MMPRT and PSCL is unknown. This study aimed to investigate the properties of PSCL, such as the location, volume, and duration from injury to the time of MRI (duration). We hypothesized that PSCL is observed in the early phase after the MMPRT onset.

Methods

T2-weighted fat-suppression magnetic resonance imaging (MRI) was obtained from 55 patients with MMPRT preoperatively. The prevalence of the PSCL; giraffe neck, cleft, and ghost signs; severe MM extrusion (> 3 mm); and the PSCL volume were evaluated. The PSCL lesion elliptical volume (mm3) was calculated by measuring the anteroposterior, transverse, and craniocaudal dimensions.

Results

PSCL was observed in 34 (62%) cases. The mean volume of the PSCL was 102.0 mm3. A significantly shorter duration was observed in the PSCL-positive group (5.6 weeks) than that in the PSCL-negative group (40.9 weeks, P < 0.01), although no significant correlation was observed between the PSCL volume and duration. The sensitivity for the MMPRT was 90.5% when the cut-off duration value was 3 weeks and 81.8% when the cut-off value was 8 weeks.

Conclusions

MRI examination may detect PSCL if it is performed early following MMPRT onset. Detecting PSCL may be useful in diagnosing MMPRT with high sensitivity.

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Acknowledgements

We would like to thank Editage (www.editage.com) for English language editing.

Funding

This research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors.

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Authors

Contributions

Takayuki Furumatsu designed the study. Yuki Okazaki and Yuya Kajiki contributed to the analysis and interpretation of data. All authors contributed to data collection and interpretation, and critically reviewed the manuscript. All authors approved the final version of the manuscript and agreed to be accountable for all aspects of the work in ensuring that questions related to the accuracy or integrity of any part of the work are appropriately investigated and resolved.

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Correspondence to Takayuki Furumatsu.

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This study and all protocols were approved by our institutional ethics review board.

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All patients provided informed consent to participate in this study.

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Okazaki, Y., Furumatsu, T., Kajiki, Y. et al. A posterior shiny-corner lesion of the tibia is observed in the early phase after medial meniscus posterior root tear. Eur J Orthop Surg Traumatol 32, 301–306 (2022). https://doi.org/10.1007/s00590-021-02968-4

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  • DOI: https://doi.org/10.1007/s00590-021-02968-4

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