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Insufficient restoration of meniscal extrusion by transtibial pullout repair for medial meniscus posterior root tears

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  • Published:
Knee Surgery, Sports Traumatology, Arthroscopy Aims and scope

Abstract

Purpose

The long-term changes in the dynamics of the medial meniscus after transtibial pullout repair for medial meniscus posterior root tears (MMPRTs) are not completely understood. Thus, the aim of this study was to investigate the effects of transtibial pullout repair on MMPRTs and whether the effects would be sustained.

Methods

Nineteen knees with MMPRTs that were treated by trans-tibial pullout repair were enrolled in this study. Medial meniscus extrusion (MME) was measured by ultrasonography during knee extension (no weight-bearing with the knee at 0° extension: NW0°) and 90° flexion (no weight-bearing with the knee at 90° flexion: NW90°) with the patient in the supine position and with full weight-bearing (FW0°) preoperatively and at 3 and 12 months postoperatively. The clinical outcomes were assessed using the Knee Injury and Osteoarthritis Outcome Score, Lysholm score, and International Knee Documentation Committee score.

Results

The difference in MME with NW0° was not statistically significant between the preoperative (3.4 ± 1.0 mm) and 12-month postoperative (3.7 ± 0.6 mm) time points. The MME with NW90° at 3 (2.1 ± 0.7 mm) and 12 months (2.9 ± 0.6 mm) postoperatively were significantly lower than the preoperative values (3.4 ± 0.8 mm) (P < 0.05). However, the value significantly increased from 3 to 12 months postoperatively (P < 0.05). The MME with FW0° at 12 months postoperatively (4.3 ± 0.6 mm) was significantly larger than that at pre-operatively (3.6 ± 0.9 mm) (P < 0.05). All the patients’ clinical conditions were significantly improved at 12 months postoperatively when compared to their preoperative clinical conditions.

Conclusion

Surgery did not reduce the extrusion in the no weight-bearing and weight-bearing positions at knee extension, and these values increased in the postoperative period. In addition, while the surgery reduced the extrusion in the knee flexion position, the restoration achieved by the surgery was not sustained in the long term.

Level of evidence: Level IV.

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Data Availability

Not applicable.

Abbreviations

FW0°:

Full weight-bearing

ICC:

Intraclass correlation coefficient

IKDC:

International Knee Documentation Committee

K/L:

Kellgren and Lawrence grade

KOOS:

Knee Injury and Osteoarthritis Outcome Score

MCL:

Medial collateral ligament

MME:

Medial meniscus extrusion

MMPRT:

Medial meniscus posterior root tear

MRI:

Magnetic resonance imaging

NW0°:

No weight-bearing with the knee at 0° extension

NW90°:

No weight-bearing at knee 90° flexion

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Acknowledgements

The authors would like to thank Japan Medical Communication and American Journal Experts for performing the English language editing of this article.

Funding

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

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Authors and Affiliations

Authors

Contributions

RT and TO designed the study. RT carried out data analysis and wrote the paper. SH, SY, and KH helped to design this study. SK helped to evaluate items. MK and HC checked the study and helped to modify the manuscript. All authors read and approved the final manuscript.

Corresponding author

Correspondence to Ryota Takase.

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We declare no conflicts of interest in association with the authorship or publication of this contribution.

Ethical approval

The present study was ethically approved by the institutional review board of the hospital where the study was performed (approval number was 19060501).

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Informed consent was obtained from all patients included in the study.

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Takase, R., Ohsawa, T., Hashimoto, S. et al. Insufficient restoration of meniscal extrusion by transtibial pullout repair for medial meniscus posterior root tears. Knee Surg Sports Traumatol Arthrosc 31, 4895–4902 (2023). https://doi.org/10.1007/s00167-023-07528-3

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