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Related Experiment Video

Updated: Jun 18, 2026

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

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

Published on: May 5, 2023

Mobile bearing dislocation in lateral unicompartmental knee replacement.

H Pandit¹, C Jenkins, D J Beard

¹Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences, University of Oxford, Headington, Oxford, UK.

|November 19, 2009

Summary

This study improved lateral unicompartmental knee replacement (UKR) by modifying surgical techniques and introducing a domed tibial plateau. These changes significantly reduced the early dislocation failure rate, enhancing implant survivability.

Related Experiment Videos

Last Updated: Jun 18, 2026

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

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

Published on: May 5, 2023

Area of Science:

Orthopedic Surgery
Biomedical Engineering
Medical Device Design

Background:

Mobile bearing designs in lateral unicompartmental knee replacement (UKR) offer theoretical advantages but have shown high failure rates due to bearing dislocation.
Initial series of lateral Oxford UKR demonstrated an unacceptably high incidence of dislocations, primarily within the first year post-implantation.

Purpose of the Study:

To evaluate the impact of surgical technique modifications and a novel convex domed tibial plateau design on reducing dislocation rates in lateral UKR.
To compare the dislocation rates across three distinct series of lateral Oxford UKR procedures.

Main Methods:

A retrospective analysis of three series of lateral Oxford UKR procedures (n=53, n=65, n=101) was conducted.
Series 1 used a standard open approach. Series 2 incorporated modified surgical techniques. Series 3 utilized both modified techniques and a domed tibial plateau design.
Dislocation rates (overall and primary) were tracked and compared across the series over a 4-year period.

Main Results:

The overall dislocation rate at 4 years decreased from 11% in the original series to 5% in the second, and 1.7% in the third series.
The primary dislocation rate at 4 years showed a similar trend, decreasing from 10% to 5% and finally to 0% in the respective series.
Statistical analysis indicated significant differences in both overall (p=0.04) and primary (p=0.03) dislocation rates between the series.

Conclusions:

The combination of a modified surgical technique and a new convex domed tibial plateau design significantly reduces early dislocation rates in lateral UKR.
These design and technique improvements appear to have successfully addressed the primary mode of failure, achieving an acceptable dislocation rate.