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Accuracy of tibial component placement in unicompartmental knee arthroplasty performed using an accelerometer-based portable navigation system

  • Yoshio MatsuiEmail author
  • Shinichi Fukuoka
  • Sho Masuda
  • Masanori Matsuura
  • Toshiaki Masada
  • Kenji Fukunaga
KNEE
  • 36 Downloads

Abstract

Purpose

There is a need for new devices to improve the accuracy of implantation in unicompartmental knee arthroplasties (UKAs). The accelerometer-based portable navigation system is expected to improve this accuracy. This study aimed to compare the accuracy of UKAs performed by the portable navigation system with that of the conventional method, and to investigate whether the portable navigation system can complement the surgeon’s experience.

Methods

The study comprised of 80 Oxford UKAs. Knees were divided into two groups based on the method of tibial osteotomy: the conventional group (37 UKAs performed by an experienced surgeon using the extra-medullary guide) and the portable navigation group (43 UKAs performed by 2 unaccustomed surgeons using the navigation system). The absolute error from the target angle on the coronal and sagittal plane was measured on whole lower leg X-ray. The incidence of outliers (> 3°) was compared between the groups using Fisher’s exact probability test.

Results

The incidences of outliers on the coronal plane were 41.0% (15 of 37 knees) in the conventional group and 9.3% (4 of 43 knees) in the portable navigation group (p < 0.0001). The incidences of outliers on the sagittal plane were 13.5% (5 of 37 knees) in the conventional group and 14.0% (6 of 43 knees) in the portable navigation group (p = 0.3772).

Conclusion

This is the first report on the usefulness of an accelerometer-based portable navigation system in UKA. The use of this system improves the accuracy of implantation of the tibial component beyond the experience of the surgeon.

Level of evidence

Retrospective comparative study, Level III

Keywords

Unicompartmental knee arthroplasty Accelerometer Portable navigation system Alignment 

Notes

Funding

This study was not externally funded.

Compliance with ethical standards

Conflict of interest

All authors declare that they have no conflict of interest.

Ethical approval

All study participants provided informed consent, and the study design was approved by the appropriate ethics review board.

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Copyright information

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

Authors and Affiliations

  1. 1.Osaka City General HospitalOsaka CityJapan
  2. 2.Nishinomiya Watanabe HospitalOsaka CityJapan

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