scholarly journals Correction to: Periprosthetic fractures after medial unicompartmental knee arthroplasty: a narrative review

2021 ◽  
Author(s):  
L. Thoreau ◽  
D. Morcillo Marfil ◽  
E. Thienpont
Keyword(s):  
Knee Arthroplasty ◽  
Unicompartmental Knee Arthroplasty ◽  
Narrative Review ◽  
Periprosthetic Fractures ◽  
Unicompartmental Knee ◽  
Medial Unicompartmental Knee Arthroplasty

Risk of revision for medial unicompartmental knee arthroplasty according to fixation and bearing type

2021 ◽  
Vol 103-B (7) ◽  
pp. 1261-1269
Author(s):  
Joost A. Burger ◽  
Hendrik A. Zuiderbaan ◽  
Inger N. Sierevelt ◽  
Liza van Steenbergen ◽  
Peter A. Nolte ◽  
...  
Keyword(s):  
Knee Arthroplasty ◽  
Unicompartmental Knee Arthroplasty ◽  
Hospital Volume ◽  
Cox Regression ◽  
Mobile Bearing ◽  
Periprosthetic Fractures ◽  
Fixed Bearing ◽  
Adjusted Risk ◽  
Unicompartmental Knee ◽  
Medial Unicompartmental Knee Arthroplasty

Aims Uncemented mobile bearing designs in medial unicompartmental knee arthroplasty (UKA) have seen an increase over the last decade. However, there are a lack of large-scale studies comparing survivorship of these specific designs to commonly used cemented mobile and fixed bearing designs. The aim of this study was to evaluate the survivorship of these designs. Methods A total of 21,610 medial UKAs from 2007 to 2018 were selected from the Dutch Arthroplasty Register. Multivariate Cox regression analyses were used to compare uncemented mobile bearings with cemented mobile and fixed bearings. Adjustments were made for patient and surgical factors, with their interactions being considered. Reasons and type of revision in the first two years after surgery were assessed. Results In hospitals performing less than 100 cases per year, cemented mobile bearings reported comparable adjusted risks of revision as uncemented mobile bearings. However, in hospitals performing more than 100 cases per year, the adjusted risk of revision was higher for cemented mobile bearings compared to uncemented mobile bearings (hazard ratio 1.78 (95% confidence interval 1.34 to 2.35)). The adjusted risk of revision between cemented fixed bearing and uncemented mobile bearing was comparable, independent of annual hospital volume. In addition, 12.3% of uncemented mobile bearing, 20.3% of cemented mobile bearing, and 41.5% of uncemented fixed bearing revisions were for tibial component loosening. The figures for instability were 23.6%, 14.5% and 11.7%, respectively, and for periprosthetic fractures were 10.0%, 2.8%, and 3.5%. Bearing exchange was the type of revision in 40% of uncemented mobile bearing, 24.3% of cemented mobile bearing, and 5.3% cemented fixed bearing revisions. Conclusion The findings of this study demonstrated improved survival with use of uncemented compared to cemented mobile bearings in medial UKA, only in those hospitals performing more than 100 cases per year. Cemented fixed bearings reported comparable survival results as uncemented mobile bearings, regardless of the annual hospital volume. The high rates of instability, periprosthetic fractures, and bearing exchange in uncemented mobile bearings emphasize the need for further research. Cite this article: Bone Joint J 2021;103-B(7):1261–1269.

scholarly journals High usage of medial unicompartmental knee arthroplasty negatively influences total knee arthroplasty revision rate

2021 ◽  
Author(s):  
Antonio Klasan ◽  
Mei Lin Tay ◽  
Chris Frampton ◽  
Simon William Young
Keyword(s):  
Total Knee Arthroplasty ◽  
Knee Arthroplasty ◽  
Unicompartmental Knee Arthroplasty ◽  
Revision Rate ◽  
Oxford Knee Score ◽  
High Volume ◽  
Unicompartmental Knee ◽  
Patient Reported ◽  
Medial Unicompartmental Knee Arthroplasty ◽  
Total Knee

Abstract Purpose Surgeons with higher medial unicompartmental knee arthroplasty (UKA) usage have lower UKA revision rates. However, an increase in UKA usage may cause a decrease of total knee arthroplasty (TKA) usage. The purpose of this study was to investigate the influence of UKA usage on revision rates and patient-reported outcomes (PROMs) of UKA, TKA, and combined UKA + TKA results. Methods Using the New Zealand Registry Database, surgeons were divided into six groups based on their medial UKA usage: < 1%, 1–5%, 5–10%, 10–20%, 20–30% and > 30%. A comparison of UKA, TKA and UKA + TKA revision rates and PROMs using the Oxford Knee Score (OKS) was performed. Results A total of 91,895 knee arthroplasties were identified, of which 8,271 were UKA (9.0%). Surgeons with higher UKA usage had lower UKA revision rates, but higher TKA revision rates. The lowest TKA and combined UKA + TKA revision rates were observed for surgeons performing 1–5% UKA, compared to the highest TKA and UKA + TKA revision rates which were seen for surgeons using > 30% UKA (p < 0.001 TKA; p < 0.001 UKA + TKA). No clinically important differences in UKA + TKA OKS scores were seen between UKA usage groups at 6 months, 5 years, or 10 years. Conclusion Surgeons with higher medial UKA usage have lower UKA revision rates; however, this comes at the cost of a higher combined UKA + TKA revision rate that is proportionate to the UKA usage. There was no difference in TKA + UKA OKS scores between UKA usage groups. A small increase in TKA revision rate was observed for high-volume UKA users (> 30%), when compared to other UKA usage clusters. A significant decrease in UKA revision rate observed in high-volume UKA surgeons offsets the slight increase in TKA revision rate, suggesting that UKA should be performed by specialist UKA surgeons. Level of evidence III, Retrospective therapeutic study.

scholarly journals Changes in Bone Density in Metal-Backed and All-Polyethylene Medial Unicompartmental Knee Arthroplasty

2016 ◽  
Vol 31 (3) ◽  
pp. 702-709 ◽  
Author(s):  
Chloe E.H. Scott ◽  
Frazer A. Wade ◽  
Rajarshi Bhattacharya ◽  
Deborah MacDonald ◽  
Pankaj Pankaj ◽  
...  
Keyword(s):  
Bone Density ◽  
Knee Arthroplasty ◽  
Unicompartmental Knee Arthroplasty ◽  
Unicompartmental Knee ◽  
Medial Unicompartmental Knee Arthroplasty
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