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The risk of graft impingement still exists in modern ACL surgery and correlates with degenerative MRI signal changes

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Knee Surgery, Sports Traumatology, Arthroscopy Aims and scope

Abstract

Purpose

Anatomic tunnel placement in ACL reconstruction is crucial to restore knee function. The aims of this study were to (i) evaluate the accuracy of tunnel placement for primary state-of-the-art ACL reconstruction, and (ii) examine the correlation between incorrect tunnel placement, graft appearance, and notch impingement.

Methods

In this retrospective study, all patients underwent primary single-bundle ACL reconstruction with independent drilling of the femoral and tibial tunnels according to anatomical landmarks. The accuracy of tunnel placement and the rate of notch impingement were analysed with MRI. The study cohort was subdivided according to the morphology of the graft: intact, degeneration, and re-rupture. The objective outcome was evaluated with the IKDC objective score, and the subjective outcomes were evaluated with the IKDC subjective score, the Lysholm knee score, the KOOS, and the Tegner activity scale score.

Results

Eighty-seven consecutive patients with a mean follow-up of 3.8 ± 1.4 years were evaluated. There was no significant difference among the groups concerning the baseline characteristics. The re-rupture rate was 9.2%. The position of the femoral tunnel was correct in 92% of the patients, and the position of the tibial tunnel was correct in 93% of the patients. In the intact group, impingement was not found in any of the cases, whereas the rate of impingement in the degeneration (65%) and re-rupture (80%) groups was significantly higher than that in the intact group (p < 0.001). The risk of impingement was more likely with femoral (71% vs. 13%, p < 0.001) or tibial (100% vs. 11%, p < 0.001) malpositioning. The objective IKDC score was A in 52 patients (60%), B in 26 patients (30%), and C in 9 patients (10%). The average subjective IKDC score, Lysholm score, and KOOS were comparable in the intact and degeneration groups but significantly lower in the patient group with newly diagnosed re-ruptures (p = 0.05). The Tegner activity scale score was comparable in all three groups.

Conclusion

Even though the accuracy of femoral tunnel placement in modern single-bundle ACL reconstruction is greater, the risk of malpositioning and graft impingement remains. In our patient cohort, there was a clear correlation between ACL graft impingement, degenerative changes in MRI, and incorrect tunnel positioning. The surgeon must focus on accurate tunnel placement specific to individual patient anatomy.

Level of evidence

Level III.

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Acknowledgements

The authors would like to thank the AUVA for the funding of the project within the grant ID 9/19. We would like to express our great appreciation to Dr. Wolfgang Huf for his key role in the analysis and interpretation of data. Dr. T. Brüll provided us with very valuable advice and we are particularly grateful for the assistance in the radiological follow-up. Assistance provided by the whole staff of the radiology department was greatly appreciated.

Funding

The study was funded by a Grant (ID 9/19) of the Allgemeine Unfall Versicherungsanstalt (AUVA).

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Authors and Affiliations

  1. Department of Orthopaedic Surgery and Traumatology, AUVA Traumacenter Meidling, Vienna, Austria

    S. Schützenberger, S. Grabner, D. Schallmayer, D. Kontic, F. Keller & C. Fialka

  2. Department for Traumatology, Sigmund Freud Medical University, Vienna, Austria

    C. Fialka

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  1. S. Schützenberger
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  2. S. Grabner
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  3. D. Schallmayer
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  4. D. Kontic
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Contributions

All authors declare that they have made substantial contributions to conception and design, or acquisition of data, or analysis and interpretation of data. They have been involved in drafting the manuscript or revising it critically for important intellectual content. They have given final approval of the version to be published. They agree 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 S. Schützenberger.

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All authors declare that they have no conflict of interest.

Ethical approval

Ethical approval was given by the Institutional Review Board of the AUVA, Austria (ID 19/2018).

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Written informed consent was obtained from all patients before enrolment.

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Schützenberger, S., Grabner, S., Schallmayer, D. et al. The risk of graft impingement still exists in modern ACL surgery and correlates with degenerative MRI signal changes. Knee Surg Sports Traumatol Arthrosc 29, 2880–2888 (2021). https://doi.org/10.1007/s00167-020-06300-1

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