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Abnormal tibial alignment is a risk factor for lateral meniscus posterior root tears in patients with anterior cruciate ligament ruptures

  • Kelechi R. Okoroha
  • Ravi B. Patel
  • Omar Kadri
  • Toufic R. Jildeh
  • Andrew Krause
  • Caleb Gulledge
  • Eric C. Makhni
  • Vasilios Moutzouros
KNEE

Abstract

Purpose

The purpose of this study was to identify if abnormal tibial alignment was a risk factor for lateral meniscus posterior root tears (LMPRT) in patients with acute anterior cruciate ligament (ACL) ruptures.

Methods

The medical charts of 200 patients treated for ACL ruptures between 2013 and 2016 were retrospectively reviewed and evaluated. MRI images and reports were assessed for concurrent meniscal tears. Radiographs were reviewed for tibia vara and tibial slope angles and MRI reports identifying lateral root tears were compared to intraoperative reports to determine accuracy. Multiple logistic regression models were constructed to identify potential risk factors for LMPRTs.

Results

Of the 200 patients reviewed, a total of 97 individuals with concurrent meniscal injuries were identified. In patients sustaining a concurrent meniscal injury, there was a 4% incidence of medial meniscus posterior root tears and a 10.3% incidence of LMPRTs. Patients sustaining an ACL injury with an LMPRT were found to have greater tibia vara angles (4.2 ± 1.0 vs. 2.9 ± 1.7; p = 0.024), increased tibial slopes (12.6 ± 1.5 vs. 10.7 ± 2.9; p = 0.034), and higher BMIs (27.3 ± 2.9 vs. 25.3 ± 5.9; p = 0.034) when compared to patients without meniscus tears. There was low agreement between MRI and arthroscopic findings (kappa rate = 0.54). Multiple logistic regression analysis demonstrated that a tibia vara angle > 3 was associated with a 5.2-fold increase (95% CI 0.99–27.01; p = 0.050), and a tibial slope > 12 with a 5.4-fold increase (95% CI 1.03–28.19; p = 0.046) in LMPRTs.

Conclusions

Patients with greater tibia varus angles, increased tibial slopes, and higher BMIs were found to have an increased risk of LMPRTs when sustaining an ACL rupture. There was a low rate of agreement between MRI and arthroscopy in identifying LMPRTs. In patients with ACL ruptures who have abnormal tibial alignment or increased BMI, physicians should be watchful for lateral meniscus posterior root tears.

Level of evidence

3.

Keywords

Meniscus Root tear Knee ACL Ligament Risk factors 

Abbreviations

LMPRT

Lateral meniscus posterior root tear

MMPRT

Medial meniscus posterior root tear

ACL

Anterior cruciate ligament

BMI

Body mass index

ASA

American Society of Anesthesiologists

KLG

Kellgren–Lawrence Grade

TPAA

Tibial proximal anatomic axis

ATC

Anterior tibial cortex

PTC

Posterior tibial cortex

Notes

Compliance with ethical standards

Conflict of interest

All authors declare that they have no conflict of interest.

Ethical approval

The local institutional review board approved this study (IRB: Henry Ford Hospital, Detroit, MI).

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Copyright information

© European Society of Sports Traumatology, Knee Surgery, Arthroscopy (ESSKA) 2018

Authors and Affiliations

  • Kelechi R. Okoroha
    • 1
  • Ravi B. Patel
    • 1
  • Omar Kadri
    • 1
  • Toufic R. Jildeh
    • 1
  • Andrew Krause
    • 2
  • Caleb Gulledge
    • 2
  • Eric C. Makhni
    • 1
  • Vasilios Moutzouros
    • 1
  1. 1.Department of Orthopaedic SurgeryHenry Ford Health System, Henry Ford HospitalDetroitUSA
  2. 2.Wayne State University School of MedicineDetroitUSA

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