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Related Experiment Video

Updated: Jun 17, 2026

In Vitro Application of a Wireless Sensor in Flexion-Extension Gap Balance of Unicompartmental Knee Arthroplasty
07:33

In Vitro Application of a Wireless Sensor in Flexion-Extension Gap Balance of Unicompartmental Knee Arthroplasty

Published on: May 5, 2023

Early failures in unicondylar arthroplasty.

Thomas K Fehring1, Susan M Odum, John L Masonis

  • 1OrthoCarolina, Charlotte, North Carolina, USA. Thomas.Fehring@orthocarolina.com

Orthopedics
|January 9, 2010
PubMed
Summary

The need for early revision of unicondylar knee arthroplasty has significantly increased. Factors contributing to this rise include potential patient selection issues and technical errors in surgical procedures.

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Area of Science:

  • Orthopedic Surgery
  • Biomedical Engineering

Background:

  • Unicondylar arthroplasty is regaining popularity for isolated knee arthritis.
  • An observed increase in early revisions of unicondylar knee arthroplasty at a revision center prompted this investigation.

Purpose of the Study:

  • To determine if the rate of unicondylar revision has increased over time.
  • To identify factors contributing to early failure of unicondylar arthroplasty.

Main Methods:

  • A comparative analysis of revision total knee arthroplasties (TKAs) performed between 1990-1999 (period 1) and 2000-2008 (period 2).
  • Calculation of unicondylar revision prevalence, time to failure, and reasons for failure for both periods.

Main Results:

  • Unicondylar revisions increased from 1.6% (7/425) in period 1 to 5.8% (43/744) in period 2.

Related Experiment Videos

Last Updated: Jun 17, 2026

In Vitro Application of a Wireless Sensor in Flexion-Extension Gap Balance of Unicompartmental Knee Arthroplasty
07:33

In Vitro Application of a Wireless Sensor in Flexion-Extension Gap Balance of Unicompartmental Knee Arthroplasty

Published on: May 5, 2023

  • Average time to failure decreased from 169 months in period 1 to 36 months in period 2.
  • Reasons for failure shifted from poly wear and loosening in period 1 to include technical errors in period 2.

    • Conclusions:

    • Early failure of unicondylar arthroplasty is increasing.
    • Potential contributing factors include inappropriate patient selection and surgical inexperience.
    • Patients should be informed about the possibility of early revision surgery.