Knee Surgery, Sports Traumatology, Arthroscopy

, Volume 24, Issue 11, pp 3466–3473 | Cite as

Comparison of ultra-congruent mobile- and fixed-bearing navigation-assisted total knee arthroplasty with minimum 5-year follow-up

  • Seong Hwan Kim
  • Jung-Won Lim
  • Young-Bong Ko
  • Min-Gu Song
  • Han-Jun LeeEmail author



The purpose of this study was to compare the midterm outcomes between fixed and mobile ultra-congruent (UC) bearings in total knee arthroplasty (TKA).


This is a retrospective matched-pairs case–control study of patients who underwent primary navigation-assisted TKA with a minimum 5-year follow-up. A total of 182 cases involved the fixed UC bearing system as Group 1 and 101 cases involved mobile UC bearing system group as Group 2. After 1:1 matching, 73 knees in each group were enrolled. Clinical and radiographic outcomes were evaluated.


The overall survival was 143 of 146 cases (97.9 %) at final follow-up, and 72 of 73 cases (96.3 %) in Group 1 and 71 of 73 cases (95.8 %) in Group 2 at final follow-up based on an endpoint of revision surgery. The reasons of revision TKA were periprosthetic fracture in Group 1, infection and bearing dislocation in Group 2. There was no statistical difference in Hospital for Special Surgery (HSS) scores, Knee Society Scores (KSS), WOMAC index score evaluations between groups.


This study demonstrated that the fixed-bearing UC prosthesis could provide satisfactory performance compared with that of the mobile-bearing UC prosthesis with minimum 5-year follow-up. The fixed-bearing UC prosthesis could be considered in navigation-assisted TKA with theoretical advantages of UC design.

Level of evidence



Total knee arthroplasty Ultra-congruent bearing Navigation system Mobile bearing Fixed bearing 



This research was supported by the Aesculap AG, Tuttlingen, Germany.

Compliance with ethical standards

Conflict of interest

Each author certifies that he or she has no commercial associations (e.g. consultancies, stock ownership, equity interest, patent/licensing arrangements, etc.) that might pose a conflict of interest in connection with the submitted article.

Ethical approval

Each author certifies that his or her institution approved or waived approval for the reporting of this investigation and that all investigations were conducted in conformity with ethical principles of research.


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Copyright information

© European Society of Sports Traumatology, Knee Surgery, Arthroscopy (ESSKA) 2016

Authors and Affiliations

  • Seong Hwan Kim
    • 1
  • Jung-Won Lim
    • 1
  • Young-Bong Ko
    • 1
  • Min-Gu Song
    • 1
  • Han-Jun Lee
    • 1
    Email author
  1. 1.Department of Orthopaedic SurgeryChung-Ang University College of MedicineSeoulSouth Korea

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