Clinical Orthopaedics and Related Research®

, Volume 470, Issue 1, pp 61–68 | Cite as

No Long-term Difference Between Fixed and Mobile Medial Unicompartmental Arthroplasty

  • Sebastien Parratte
  • Vanessa Pauly
  • Jean-Manuel Aubaniac
  • Jean-Noel A. ArgensonEmail author
Symposium: Papers Presented at the Annual Meetings of The Knee Society



Early studies in the literature reported relatively high early minor reintervention rate for the mobile-bearing unilateral knee arthroplasty (UKA) compared with short- and midterm survivorship after fixed- or mobile-bearing UKA. However, whether the long-term function and survivorship are similar is unclear.


We therefore asked whether (1) mobile- or fixed-bearing UKAs have comparable function (as measured by the Knee Society scores); (2) mobile- and fixed-bearing UKA have comparable Knee Society radiographic scores; and (3) the long-term survivorship is comparable.


We retrospectively reviewed 75 patients (79 knees) with a fixed-bearing UKA and 72 patients (77 knees) with a mobile-bearing UKA operated on between 1989 and 1992. Mean age of the patients was 63 years; gender and body mass index (26 kg/m2) were comparable in the two groups. We obtained Knee Society function and radiographic scores and determined survival. The minimum followup was 15 years (mean, 17.2 ± 4.8 years; range, 15–21.2 years).


The mean Knee Society function and knee scores were comparable in the two groups. Radiographically, the number of overcorrections and the number of radiolucencies were statistically higher in the mobile-bearing group (69% versus 24%). At final followup, considering revision for any reason, 12 of 77 (15%) UKAs were revised (for aseptic loosening, dislocation, and arthritis progression) in the mobile-bearing group and 10 of 79 (12%) in the fixed-bearing group (for wear and arthritis progression).


This long-term study did not demonstrate any difference in survivorship between fixed and mobile-bearing but pointed out specific modes of failure.

Level of Evidence

Level III, comparative study. See the Guidelines for Authors for a complete description of levels of evidence.


Anterior Cruciate Ligament Aseptic Loosening Lateral Compartment Knee Society Score Radiolucent Line 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.



We thank Mina Chevrol-Benkeddache for her participation in the clinical review of the patients.


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Copyright information

© The Association of Bone and Joint Surgeons® 2011

Authors and Affiliations

  • Sebastien Parratte
    • 1
  • Vanessa Pauly
    • 1
  • Jean-Manuel Aubaniac
    • 1
  • Jean-Noel A. Argenson
    • 1
    • 2
    Email author
  1. 1.Center for Arthritis Surgery, Hôpital Sainte-MargueriteAix-Marseille UniversityMarseilleFrance
  2. 2.Service de Chirurgie Orthopédique, Hôpital Sainte MargueriteMarseilleFrance

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