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Posterior Tibial Slope in Anterior Cruciate Ligament Surgery: A Systematic Review

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Abstract

Background

While the literature suggests a correlation between posterior tibial slope and sagittal stability of the knee, there is a lack of consensus relating to how to measure the slope, what a normal slope value would be, and which critical values should guide extra surgical treatment.

We performed a systematic literature review looking at the posterior tibial slope and cruciate ligament surgery. Our aims were to define a gold standard measurement technique of posterior tibial slope, as well as determining its normal range and the important values for consideration of adjuncts during cruciate ligament surgery.

Methods

Electronic searches of MEDLINE (PubMed), CINAHL, Cochrane, Embase, ScienceDirect, and NICE in June 2020 were completed. Inclusion criteria were original studies in peer-reviewed English language journals. A quality assessment of included studies was completed using the Methodological Index for Non-Randomized Studies (MINORS) Criteria.

Results

Two-hundred and twenty-one papers were identified; following exclusions 34 papers were included for data collection. The mean MINORS score was 13.8 for non-comparative studies and 20.4 for comparative studies, both indicating fair to good quality studies. A large variation in the posterior tibial slope measurement technique was identified, resulting in a wide range of values reported. A significant variation in slope value also existed between different races, ages and genders.

Conclusion

Cautiously, the authors suggest a normal range of 6-12º, using the proximal tibial axis at 5 and 15 cms below the joint. We suggest 12º as a cut-off value for slope-reducing osteotomy as an adjunct to revision ligament reconstruction.

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Funding

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Authors and Affiliations

  1. Exeter Knee Reconstruction Unit, Royal Devon and Exeter Hospital, Exeter, EX2 5DW, Devon, UK

    Vipul Mandalia, Nivraj Bhamber, Simon Middleton & James Houston

  2. Department of Trauma and Orthopaedics, Swansea Bay University Health Board, Swansea, SA6 6NL, UK

    Morgan Bayley

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  1. Vipul Mandalia
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The roles of authors: All authors: substantial contributions to the conception or design of the work; or the acquisition, analysis, or interpretation of data for the work, drafting the work, or revising it critically for important intellectual content and final approval for the version to be published.

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Correspondence to James Houston.

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Mandalia, V., Bayley, M., Bhamber, N. et al. Posterior Tibial Slope in Anterior Cruciate Ligament Surgery: A Systematic Review. JOIO 57, 1376–1386 (2023). https://doi.org/10.1007/s43465-023-00947-x

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  • DOI: https://doi.org/10.1007/s43465-023-00947-x

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