scholarly journals The Renaissance of Unicompartmental Knee Arthroplasty appears rational – A radiograph-based comparative Study on adverse Events and patient-reported Outcomes in 353 TKAs and 98 UKAs

PLoS ONE ◽  
2021 ◽  
Vol 16 (9) ◽  
pp. e0257233
Author(s):  
Magnus Tveit
Keyword(s):  
Adverse Events ◽  
Knee Arthroplasty ◽  
Complication Rate ◽  
Unicompartmental Knee Arthroplasty ◽  
Patient Reported Outcomes ◽  
Statistical Significance ◽  
Severe Complication ◽  
Unicompartmental Knee ◽  
Patient Reported ◽  
Reduced Risk

Purpose Total knee arthroplasty (TKA) and unicompartmental knee arthroplasty (UKA) are both considered suitable for antero-medial osteoarthritis and spontaneous osteonecrosis of the knee. National registry data are consistent in showing higher revision rates for UKA. Adequately adjusted, these findings may be challenged by differences in adverse events and patient-reported outcomes, as both can have serious long-term implications. Based on preoperative radiographs, the aim was to retrospectively compare the two principle surgeries in these respects. Methods All TKA procedures in 2016 in one Swedish county council were, according to certain radiograph-based consensus criteria, visually evaluated for medial UKA suitability. Then, using different regression models, they were compared with the corresponding medial UKAs performed in 2015–2017 regarding complications and patient-reported outcomes one year after surgery. Results The UKA group showed an 82% reduced risk (OR 0.2; 95% CI 0.0–0.6) of any complications, whereas the 55% reduced risk of severe complication did not reach statistical significance (OR 0.5; 95% CI 0.1–2.1). These findings corresponded in high-volume surgeries to an absolute complication rate of 0% in the UKA group and 10% in the TKA group (p = 0.005) and to a severe complication rate of 0% and 5% respectively (p = 0.05). Though no differences were seen in any general patient-reported outcomes, the pain and function based OMERACT-OARSI responder criteria indicated in both around a 60% better chance of any response (OR 1.6 CI % 0.6–4.5) and a high response (OR 1.6; 95% CI 0.7–3.4) in the UKA group. Conclusion No differences were shown in patient-reported outcomes but a clear difference in risk of complications, favoring the UKA procedure.

scholarly journals Ten-Year Survivorship, Patient-Reported Outcomes, and Satisfaction of a Fixed-Bearing Unicompartmental Knee Arthroplasty

2020 ◽  
Vol 6 (2) ◽  
pp. 267-273 ◽  
Author(s):  
Ryland Kagan ◽  
Mike B. Anderson ◽  
Travis Bailey ◽  
Aaron A. Hofmann ◽  
Christopher E. Pelt
Keyword(s):  
Knee Arthroplasty ◽  
Unicompartmental Knee Arthroplasty ◽  
Patient Reported Outcomes ◽  
Fixed Bearing ◽  
Unicompartmental Knee ◽  
Patient Reported

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.

Mid-Term Evaluation of the Unicompartmental Knee Arthroplasty in Patients with BMI of 40 or Greater

2019 ◽  
Author(s):  
Akshay Seth ◽  
Johanna Dobransky ◽  
Waleed Albishi ◽  
Geoffrey F. Dervin
Keyword(s):  
Survival Rate ◽  
Knee Arthroplasty ◽  
Unicompartmental Knee Arthroplasty ◽  
Patient Reported Outcome Measures ◽  
Patient Reported Outcome ◽  
Primary Objective ◽  
Term Survival ◽  
Unicompartmental Knee ◽  
Patient Reported

AbstractLimited evidence is available on mid-term follow-up for patients with body mass index (BMI) ≥ 40 receiving a unicompartmental knee arthroplasty (UKA). The primary objective of this study was to investigate survival of the UKA in patients with BMI ≥ 40. Secondary objectives were to assess functional and patient reported outcome measures (PROMs). Survival analysis with endpoint revision of any component for any reason was conducted using Kaplan–Meier technique on 121 knees (103 patients) that underwent UKA with Oxford Phase 3 implant (Oxford Knee, Biomet, Swindon, United Kingdom) between September 2001 and March 2014 by seven surgeons. Survivorship differences were compared using Log Rank (Mantel-Cox) tests, and Cox Proportional Hazard Model was used to assess predictors of failure. Preoperative PROMs were compared at 2 and 5 years postoperatively using paired t-tests. Mean age of patients was 58 years (43–75), mean BMI 43 kg/m2 (40–51), and mean follow-up 7 years (2 months to 15 years). Survival rate for the whole cohort was 92% at 2 years and 86% at 5 years. Females had a significantly higher revision rate than males (p = 0.043). A total of 19 knees required revision (16 to TKA, 2 polyethylene liner exchanges, and 1 femoral component and liner revision). With respect to PROMs, there was a significant improvement at 2 and 5 years (p < 0.001) on 4 of 5 knee injury and osteoarthritis outcome score subscales. The mid-term survival rate for the Oxford UKA in patients with morbid obesity is similar to that of other nondesigner patient series with BMI ≥ 30, which provides further evidence for the safety of the implant in this patient population with significant improvements on PROMs at short and mid-term follow-up.

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