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Preoperative latent medial laxity and correction angle are crucial factors for overcorrection in medial open-wedge high tibial osteotomy

  • Do kyung Lee
  • Joon Ho WangEmail author
  • Yougun Won
  • Young Ki Min
  • Sagar Jaiswal
  • Byung Hoon Lee
  • Jong-Yeup Kim
KNEE
  • 17 Downloads

Abstract

Purpose

This study aimed to determine which preoperative factors affect the postoperative change in the joint line convergence angle (JLCA) by preoperatively quantifying soft tissue laxity.

Methods

Thirty-four patients who underwent medial open-wedge high tibial osteotomy (HTO) with a navigation were analysed. The JLCA change after HTO was calculated using standing long-bone anteroposterior radiographs taken preoperatively and 6 months postoperatively. Latent soft tissue laxity was defined as the amount of soft tissue that can be extended to valgus or varus from the weight-bearing position, and calculated by subtracting the JLCA on weight-bearing standing radiographs from that on stress radiographs. Multiple linear regression was performed to determine the preoperative factors that statistically correlated with the postoperative JLCA change.

Results

In multiple linear regression, JLCA change had a statistically significant correlation with latent medial laxity (R = 0.6) and a statistically borderline significant correlation with correction angle (R = 0.2). These imply that the postoperative JLCA change increased by 0.6° per 1° increase in latent medial laxity, and increased by 0.2° per 1° increase in correction angle. Latent medial laxity was the most crucial factor associated with postoperative JLCA changes.

Conclusion

The JLCA change could be larger in patients with large latent medial laxity or severe varus deformity requiring a large correction, which could lead to unexpected overcorrection in HTO. Postoperative JLCA change should be considered in preoperative surgical planning. Target point shifting within the hypomochlion point could be a strategy to prevent overcorrection, especially in patients with large latent medial laxity.

Level of evidence

Level IV.

Keywords

High tibial osteotomy Soft tissue laxity Joint line convergence angle (JLCA) Latent medial laxity Correction error Overcorrection 

Notes

Acknowledgements

We appreciate Dae-Hee Lee for his effort in providing medical advice in this study.

Funding

This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science and ICT (NRF-2017R1A2B3007362).

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflicts of interest in the authorship and publication of this contribution.

Ethical approval

Ethical approval for the present study was obtained from the institutional review board of Samsung Medical Center (Study no. 2016-07-114-001)

Informed consent

For this retrospective study, formal consent is not required.

Supplementary material

167_2019_5502_MOESM1_ESM.docx (14 kb)
Supplementary material 1 (DOCX 14 kb)

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Copyright information

© European Society of Sports Traumatology, Knee Surgery, Arthroscopy (ESSKA) 2019

Authors and Affiliations

  • Do kyung Lee
    • 1
  • Joon Ho Wang
    • 2
    • 3
    Email author
  • Yougun Won
    • 1
  • Young Ki Min
    • 1
  • Sagar Jaiswal
    • 4
  • Byung Hoon Lee
    • 5
  • Jong-Yeup Kim
    • 6
  1. 1.Department of Orthopaedic Surgery, Konyang University HospitalKonyang University School of MedicineDaejeonSouth Korea
  2. 2.Department of Orthopaedic Surgery, Samsung Medical CenterSungkyunkwan University School of MedicineSeoulSouth Korea
  3. 3.Department of Health Sciences and Technology and Department of Medical Device Management and ResearchSAIHST, Sungkyunkwan UniversitySeoulSouth Korea
  4. 4.Department of Orthopaedic Surgery, Konkuk University HospitalKonkuk University School of MedicineSeoulSouth Korea
  5. 5.Department of Orthopaedic Surgery, Gachon UniversityGil Medical CenterIncheonSouth Korea
  6. 6.Department of Biomedical Informatics, College of MedicineKonyang University School of MedicineDaejeonSouth Korea

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