Survival UKA

UKA
UKA by procedure year
UKA by fixation
UKA by component
UKA by pre-PROM

Knee » Survival UKA » UKA

FIGURE Cumulative revision percentage of unicondylar knee arthroplasties by type of revision in the Netherlands in 2007-2022 (n=48,029)

TABLE Cumulative revision percentages

	Number at risk (n)	Competing Risk (95% CI)	Kaplan Meier¹ (95% CI)
Any type of revision
1-year revision (%)	40,463	2.1 (1.9-2.2)	1.9 (1.8-2.0)
3-year revision (%)	28,856	5.3 (5.1-5.4)	5.3 (5.0-5.5)
5-year revision (%)	19,562	7.2 (6.9-7.4)	7.2 (6.9-7.5)
10-year revision (%)	6,547	11.6 (11.2-12.1)	12.0 (11.5-12.4)
14-year revision (%)	1,437	14.8 (14.1-15.4)	15.5 (14.8-16.2)
Major revision²
1-year revision (%)	40,748	1.2 (1.1-1.3)	1.1 (1.0-1.2)
3-year revision (%)	29,186	4.1 (3.9-4.3)	4.1 (3.9-4.2)
5-year revision (%)	19,839	5.7 (5.5-6.0)	5.8 (5.5-6.0)
10-year revision (%)	6,636	9.9 (9.5-10.4)	10.3 (9.8-10.7)
14-year revision (%)	1,456	13.0 (12.4-13.7)	13.7 (13.0-14.4)
Minor revision³
1-year revision (%)	40,889	0.9 (0.8-1.0)	0.9 (0.8-1.0)
3-year revision (%)	30,142	1.4 (1.3-1.5)	1.5 (1.4-1.6)
5-year revision (%)	21,000	1.7 (1.6-1.9)	1.8 (1.7-1.9)
10-year revision (%)	7,665	2.1 (2.0-2.3)	2.2 (2.1-2.4)
14-year revision (%)	1,760	2.3 (2.1-2.5)	2.5 (2.3-2.7)

¹ The cumulative revision percentage using the Kaplan Meier method is shown in the figure.
² First revision of the femur or tibia component, regardless of whether a minor revision has already taken place. Therefor, the first three revision procedures were reviewed.
³Only insert and/or patella exchange (including patella addition).
UKA: unicondylarl knee arthroplasty; CI: confidence interval.

In 2007-2022, 2,153 (4.5%) primary UKAs were implanted in patients who died within fourteen years after the primary diagnosis

Knee » Survival UKA » UKA by procedure year

FIGURE Cumulative major revision percentage of unicondylar knee arthroplasties for osteoarthritis by procedure year of primary UKA in the Netherlands in 2009-2022 (n=32,727)

TABLE Cumulative major revision percentages

		Cumulative major revision percentages – Kaplan Meier (95% CI)
Procedure year primary UKA for osteoarthritis	Number (n)	1yr	3yr	5yr	7yr	10yr	13yr
2009-2010	3,151	1.81 (1.34-2.28)	6.77 (5.89-7.65)	9.68 (8.64-10.72)	11.66 (10.53-12.79)	14.89 (13.63-16.15)	17.8 (16.41-19.19)
2011-2012	3,069	1.80 (1.33-2.27)	6.71 (5.82-7.60)	8.94 (7.93-9.95)	10.97 (9.86-12.08)	13.17 (11.96-14.38)	n.a.
2013-2014	4,033	1.34 (0.99-1.69)	5.63 (4.92-6.34)	7.55 (6.73-8.37)	9.20 (8.30-10.10)	11.94 (10.66-13.22)	n.a.
2015-2016	5,509	1.22 (0.93-1.51)	3.85 (3.34-4.36)	5.00 (4.42-5.58)	6.31 (5.65-6.97)	n.a.	n.a.
2017-2018	7,583	0.86 (0.65-1.07)	2.88 (2.50-3.26)	3.93 (3.48-4.38)	n.a.	n.a.	n.a.
2019-2020	9,382	0.78 (0.60-0.96)	2.63 (2.29-2.97)	n.a.	n.a.	n.a.	n.a.

Major revision: First revision of the femur or tibia component, regardless of whether a minor revision has already taken place. Therefor, the first three revision procedures were reviewed.
Please note: n.a. if <50 cases were at risk; CI: confidence interval.

Knee » Survival UKA » UKA by fixation

FIGURE Cumulative revision percentage of unicondylar knee arthroplasties for osteoarthritis by fixation of revision in the Netherlands in 2007-2022 (n=45,561)

TABLE Cumulative revision percentages

		Cumulative revision percentages – Kaplan Meier (95% CI)
	Number (n)	1yr	3yr	5yr	7yr	10yr	14yr
Fixation
Cemented	24,231	1.7 (1.5-1.9)	5.8 (5.4-6.1)	8.1 (7.7-8.5)	10.1 (9.6-10.6)	13.2 (12.6-13.7)	16.8 (16.0-17.7)
Uncemented	21,330	2.1 (1.9-2.3)	4.4 (4.1-4.7)	5.5 (5.1-5.9)	7.1 (6.6-7.7)	8.8 (7.8-9.8)	11.3 (9.0-13.6)

Please note: Dotted lines represent the upper and lower limits of the 95% confidence interval.
UKA: unicondylar knee arthroplasty; CI: confidence interval.

Knee » Survival UKA » UKA by component

TABLE Cumulative revision percentages of primary unicondylar knee arthroplasties by prosthesis component combination of patients who underwent a UKA for osteoarthritis in the Netherlands in 2007-2022 (n=47,050)

					Type of revision (n)						Cumulative revision percentage Kaplan Meier (95% CI)
Femur component	Tibia component	Total primary UKAs (n)	Median (IQR) age (yr)	Total RAs (n)	Total knee (complete revision)	Patella addition	Only femur component	Only tibia component	Only insert/ patella	Missing/ unknown	1yr	3yr	5yr	7yr	10yr	14yr
All UKAs for osteoarthritis		47,050	64 (58-70)	3,318	2,455	8	15	71	738	31	1.9 (1.8-2.0)	5.2 (5.0-5.5)	7.2 (6.9-7.5)	9.1 (8.8-9.5)	12.0 (11.5-12.5)	15.6 (14.9-16.3)
Oxford PKR Uncemented	Oxford PKR Uncemented	19,524	65 (58-71)	796	416	1	2	20	352	5	2.0 (1.8-2.2)	4.3 (3.9-4.6)	5.4 (5.0-5.8)	6.9 (6.3-7.4)	8.3 (7.3-9.2)	n.a.
Oxford PKR Cemented	Oxford PKR Cemented	15,224	63 (57-70)	1,635	1,306	5	10	31	263	20	1.8 (1.6-2.1)	5.9 (5.5-6.3)	8.3 (7.8-8.7)	10.2 (9.6-10.7)	13.2 (12.6-13.9)	16.8 (15.9-17.8)
Physica ZUK	Physica ZUK	4,745	63 (58-69)	148	122	0	0	1	25	0	0.7 (0.4-0.9)	3.0 (2.4-3.5)	4.0 (3.3-4.8)	5.6 (4.5-6.7)	8.0 (6.3-9.7)	10.7 (7.9-13.5)
Genesis Uni	Genesis Uni	1,278*	62 (56-68)	223	211	1	0	2	6	3	2.7 (1.8-3.6)	8.9 (7.3-10.5)	12.5 (10.6-14.3)	15.0 (13-17)	17.5 (15.4-19.7)	n.a.
BalanSys Uni	BalanSys Uni	588	61 (56-68)	65	55	1	0	4	5	0	2.7 (1.4-4.0)	9.1 (6.5-11.7)	10.5 (7.7-13.4)	12.1 (9.0-15.2)	16.0 (12.1-19.9)	n.a.
Journey Uni	Journey Uni	534	62 (56-69)	33	29	0	2	1	0	1	1.2 (0.2-2.1)	5.2 (3.1-7.3)	8.5 (5.5-11.4)	10.1 (6.3-13.8)	n.a.	n.a.
Oxford PKR Uncemented	Oxford PKR Cemented	530	66 (57-73)	34	22	0	0	0	12	0	3.0 (1.5-4.5)	5.2 (3.1-7.3)	7.5 (4.8-10.2)	10.9 (6.9-14.8)	n.a.	n.a.
Oxford PKR Cemented	Oxford PKR Uncemented	231	66 (59-73)	20	9	0	1	0	10	0	3.6 (1.1-6.0)	7.9 (4.1-11.6)	9.1 (4.7-13.6)	n.a.	n.a.	n.a.
Restoris MCK	Restoris MCK	219	69 (61-75)	2	2	0	0	0	0	0	1.3 (0.0-3.0)	n.a.	n.a.	n.a.	n.a.	n.a.
Triathlon	Triathlon	197*	60 (54-65)	22	21	0	0	0	1	0	1.5 (0.0-3.2)	7.2 (3.6-10.8)	8.7 (4.6-12.9)	10.8 (5.8-15.7)	14.9 (8.3-21.5)	n.a.
HLS Uni	HLS Uni	171*	58 (52-65)	37	36	0	0	0	1	0	2.3 (0.1-4.6)	8.8 (4.5-13)	16.5 (10.9-22.0)	19.4 (13.5-25.4)	20.6 (14.5-26.7)	n.a.
Allegretto	Allegretto	108*	57 (51-65)	22	19	0	0	3	0	0	6.5 (1.8-11.1)	12 (5.9-18.2)	18 (10.7-25.4)	20.4 (12.6-28.3)	n.a.	n.a.

Please note: n.a. if <50 cases were at risk; UKA: unicondylar knee arthroplasty; CI: confidence interval; IQR: interquartile range.

Results must be interpreted with caution. Patient characteristics like age and diagnosis, as well as procedure characteristics like the experience of the surgeon performing the procedure of the prosthesis may have influenced the cumulative revision percentages.

Knee » Survival UKA » UKA by pre-PROM

FIGURE Cumulative revision percentage of unicondylar knee arthroplasties by valid pre-operative PROM of patients who underwent a UKA for osteoarthritis in the Netherlands in 2014-2022 (n=37,166)

TABLE Cumulative revision percentages

		Cumulative revision percentages – Kaplan Meier (95% CI)
	Number (n)	1yr	3yr	5yr	7yr	9yr
Pre-PROM
Valid	15,186	1.8 (1.5-2.0)	4.4 (4.0-4.8)	5.8 (5.3-6.4)	7.3 (6.4-8.2)	n.a.
Invalid	21,980	1.9 (1.7-2.1)	4.7 (4.4-5.0)	6.1 (5.7-6.5)	7.7 (7.2-8.2)	9.1 (8.4-9.9)

Valid: pre-operative PROM reported; Invalid: non-responders to pre-operative PROM; PROM: patient reported outcome measure.
Please note: Dotted lines represent the upper and lower limits of the 95% confidence interval.
n.a. if <50 cases were at risk; UKA: unicondylar knee arthroplasty; CI: confidence interval.

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