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International Orthopaedics
Published in: International Orthopaedics 12/2019

01-12-2019 | Osteoarthrosis | Original Paper

The patient results and satisfaction of knee arthroplasty in a validated grading system

Authors: Christiaan Rudolf Oosthuizen, Catherine Van Der Straeten, Innocent Maposa, Christian Hugo Snyckers, Duwayne Peter Vermaak, Sebastian Magobotha

Published in: International Orthopaedics | Issue 12/2019

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Abstract

Introduction

The validated Knee Osteoarthritis Grading System (KOGS) was implemented and clinical results were compared with patient satisfaction data and implant survivorship in a multi-centre study with surgeons familiar with unicompartmental knee arthroplasty (UKA), patellofemoral arthroplasty (PFA) and total knee arthroplasty (TKA).
This is also the first study to evaluate the prevalence of UKA and TKA in consecutive osteoarthritis (OA) knee arthroplasties assessed by this system..

Method

A consecutive cohort of knees was gathered at three different institutions as categorized by KOGS and surgically treated with the recommended implant unless clinical reasons or patient preference precluded such an option.
One thousand one hundred seventy-seven consecutive knees were evaluated including 311 TKA (26%), 695 medial UKA (59%), 154 lateral UKA (13%) and 17 PFA (2%) and the results of the categories evaluated with the Oxford Knee Score (OKS) and the complications reflected in the different categories.

Results

The failure rate of the UKA (3.5%) or TKA (1.6%) is not higher than accepted results in the literature and the difference in complications is negligible between the UKA (72%) and TKA (26%) cohorts.
Revision of a UKA to a TKA as an endpoint was 0.58% with ipsilateral progression at 0.8% over a period of five to 84 months (mean follow-up of 36 months) despite the ‘excessive’ proportion of UKA in this cohort.
The Oxford Score improvement is significant in TKA and UKA and contributes to the acceptable outcomes (The OKS for TKA improved from 20 pre-operatively to 36 post-operatively and the UKA improved from 22 pre-operatively to 39 post-operatively).

Conclusion

KOGS achieves acceptable early survival and functional results when implemented and is a suitable tool for identifying the preferred implant as was validated.
Appendix
Available only for authorised users
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Metadata
Title
The patient results and satisfaction of knee arthroplasty in a validated grading system
Authors
Christiaan Rudolf Oosthuizen
Catherine Van Der Straeten
Innocent Maposa
Christian Hugo Snyckers
Duwayne Peter Vermaak
Sebastian Magobotha
Publication date
01-12-2019
Publisher
Springer Berlin Heidelberg
Published in
International Orthopaedics / Issue 12/2019
Print ISSN: 0341-2695
Electronic ISSN: 1432-5195
DOI
https://doi.org/10.1007/s00264-019-04412-z

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