Steep medial tibial slope and prolonged delay to surgery are associated with bilateral medial meniscus posterior root tear

Takaaki Hiranaka, Takayuki Furumatsu, Yuki Okazaki, Tadashi Yamawaki, Yoshiki Okazaki, Yuya Kodama, Yusuke Kamatsuki, Toshifumi Ozaki

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

Purpose: Contralateral medial meniscus posterior root tear (MMPRT) can sometimes occur after primary surgeries for MMPRT and lead to unsatisfactory outcomes. The incidence rate and risk factors for contralateral MMPRT have not been well investigated, despite their clinical importance. Therefore, the incidence and predictors of bilateral MMPRT were aimed to be evaluated. Methods: Fourteen patients with bilateral MMPRT (group B) and 169 patients with unilateral MMPRT (group U) were enrolled in this study. Sex, age, body mass index, time between injury and surgery, and medial tibial slope angle (MTSA) were compared between the groups. MTSA was measured using lateral radiographs. Results: The incidence rate of bilateral MMPRT was 6.2% among all patients with MMPRTs. Multivariate logistic regression analysis showed that a prolonged time between injury and surgery (odds ratio [OR], 1.0; 95% confidence interval [CI] 1.00–1.01; P < 0.05) and steeper MTSA (OR, 1.85; 95% CI 1.21–2.64; P < 0.01) were significantly associated with the development of bilateral MMPRT. Receiver operating characteristic curve analysis showed that MTSA > 10.0° was associated with bilateral MMPRT, with a sensitivity of 93% and specificity of 69%. Conclusion: A longer time between injury and surgery and steeper MTSA were risk factors for the development of bilateral MMPRT. Surgeons need to pay close attention to the contralateral knee in addition to the primary injured knees when treating knees with steep MTSA. Besides, early meniscal repair of primary MMPRT would be important to prevent the events of contralateral MMPRT. Level of evidence: III.

Original languageEnglish
Pages (from-to)1052-1057
Number of pages6
JournalKnee Surgery, Sports Traumatology, Arthroscopy
Volume29
Issue number4
DOIs
Publication statusPublished - Apr 2021

Keywords

  • Bilateral injury
  • Medial meniscus
  • Medial tibial slope
  • Posterior root tear
  • Predictor
  • Sensitivity and specificity

ASJC Scopus subject areas

  • Surgery
  • Orthopedics and Sports Medicine

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