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Related Experiment Video

Updated: May 11, 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

Simultaneous versus staged bilateral unicompartmental knee replacement.

J Y Chen1, N N Lo, L Jiang

  • 1Singapore General Hospital, Department of Orthopaedic Surgery, Block 6 Level 7, Outram Road, 16960 Singapore. yqjchen@gmail.com

The Bone & Joint Journal
|June 1, 2013
PubMed
Summary
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Simultaneous bilateral unicompartmental knee replacement (UKR) offers shorter operating times, hospital stays, and lower costs compared to staged procedures. Patient outcomes and complication rates remain comparable at two years.

Area of Science:

  • Orthopedic Surgery
  • Biomedical Engineering

Background:

  • Bilateral knee osteoarthritis necessitates treatment options considering patient factors and surgical approaches.
  • Unicompartmental knee replacement (UKR) is an established procedure for isolated medial compartment knee osteoarthritis.

Purpose of the Study:

  • To compare the outcomes, complications, and costs of simultaneous versus staged bilateral unicompartmental knee replacement (UKR).

Main Methods:

  • Prospective follow-up of 171 patients undergoing bilateral UKR over two years.
  • Comparison of simultaneous (n=124) versus staged (n=47) bilateral UKR procedures.
  • Assessment of operating time, hospital stay, hemoglobin levels, transfusion rates, costs, complications, and patient outcomes at two-year follow-up.

Main Results:

Keywords:
ComplicationsFunctional OutcomesKneeSimultaneousStagedUnicompartmental knee arthroplasty

Related Experiment Videos

Last Updated: May 11, 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

  • Simultaneous bilateral UKR resulted in significantly shorter operating times (22.5 min less) and hospital stays (3 days less).
  • Mean hospital costs were significantly lower ($8892 less) for the simultaneous group.
  • No significant differences were observed in postoperative hemoglobin reduction, blood transfusion rates, complication rates, or two-year patient outcomes between the groups.

Conclusions:

  • Simultaneous bilateral UKR is a safe and cost-effective alternative to staged procedures for suitable patients.
  • The findings support the recommendation of simultaneous bilateral UKR for patients with bilateral medial compartment knee osteoarthritis.