Patient characteristics

By type of knee prosthesis
By diagnosis
Age category 2010-2019
Previous surgery 2014-2019

Knee » Patient characteristics » By type of knee prosthesis

TABLE Patient characteristics of all patients with a registered primary knee arthroplasty by type of knee arthroplasty in the Netherlands in 2019

	TKA	UKA	PFA	Total¹
N	(n=25,859)	(n=4,888)	(n=175)	(n=30,968)
Mean age (years) (SD)	69.1 (8.8)	64.8 (8.5)	55.0 (10.2)	68.3 (9.0)
Age (years) (%)
<50	2	3	27	2
50-59	13	26	45	15
60-69	34	40	18	35
70-79	40	27	9	38
≥80	11	4	1	10
Gender (%)
Men	37	45	26	38
Women	63	55	74	62
ASA score (%)
I	11	18	29	12
II	64	67	63	65
III-IV	25	15	8	23
Type of hospital (%)
General	84	76	83	83
UMC	2	1	1	2
Private	14	23	16	15
Diagnosis (%)
Osteoarthritis	97	98	96	97
Post-traumatic	2	0	4	1
Rheumatoid arthritis	1	0	0	1
Osteonecrosis	0	1	0	1
Other	0	0	0	0
Charnley-score (%)
A One knee joint affected	38	51	59	40
B1 Both knee joints affected	35	31	28	34
B2 Contralateral knee joint with a total knee prosthesis	23	17	12	22
C Multiple joints affected or chronic disease that affects quality of life	4	1	1	4
Mean Body Mass Index (kg/m²) (SD)	29.7 (5.4)	29.1 (5.8)	28.4 (5.0)	29.6 (5.5)
Body Mass Index (kg/m²) (%)
Underweight (≤18,5)	0	0	0	0
Normal weight (>18,5-25)	17	18	23	17
Overweight (>25-30)	41	45	45	42
Obesity (>30-40)	39	35	30	38
Morbid obesity (>40)	3	2	2	3
Smoking (%)
No	92	90	89	92
Yes	8	10	11	8

¹ Also contains 26 (0.08%) primary knee arthroplasties that were registered as other and 20 (0.06%) primary knee arthroplasties of which the type of prosthesis had not been registered.
TKA: total knee arthroplasty; UKA: unicondylar knee arthropalsty; PFA: patellofemoral knee arthroplasty; General: general hospital; UMC: university medical centre; Private: private hospital; SD: standard deviation.

Knee » Patient characteristics » By diagnosis

TABLE Patient characteristics of all patients with a registered primary knee arthroplasty by type of diagnosis in the Netherlands in 2019

	Osteoarthritis	Post-traumatic	Rheumatoid arthritis	Osteonecrosis	Total
N	(n=29,862)	(n=413)	(n=314)	(n=161)	(n=30,968)
Mean age (years) (SD)	68.5 (8.8)	63.0 (10.2)	65.6 (11.0)	68.5 (10.7)	68.3 (9.0)
Age (years) (%)
<50	2	9	6	3	2
50-59	15	27	21	17	15
60-69	35	37	33	29	35
70-79	38	22	31	38	38
≥80	10	5	9	13	10
Gender (%)
Men	38	41	24	33	38
Women	62	59	76	67	62
ASA score (%)
I	12	18	2	12	12
II	65	65	60	65	65
III-IV	23	17	38	23	23
Type of hospital (%)
General	83	78	88	86	83
UMC	2	9	6	2	2
Private	15	13	6	12	15
Charnley-score (%)
A One knee joint affected	40	76	23	71	40
B1 Both knee joints affected	35	12	36	16	34
B2 Contralateral knee joint with a total knee prosthesis	22	8	20	8	22
C Multiple joints affected or chronic disease that affects quality of life	3	4	21	5	4
Mean Body Mass Index (kg/m²) (SD)	29.6 (5.5)	28.4 (5.0)	28.7 (5.3)	28.7 (4.3)	29.6 (5.5)
Body Mass Index (kg/m²) (%)
Underweight (≤18,5)	0	0	1	0	0
Normal weight (>18,5-25)	17	27	25	20	17
Overweight (>25-30)	42	40	36	46	42
Obesity (>30-40)	38	29	35	33	38
Morbid obesity (>40)	3	4	3	1	3
Smoking (%)
No	92	83	91	87	92
Yes	8	17	9	13	8

Please note: In 2019, 126 (0.4%) patients had a primary knee arthroplasty after a diagnosis that is not listed in the table. Of 92 (0.3%) primary knee arthroplasties the diagnosis was not registered.
General: general hospital; UMC: university medical centre; Private: private hospital; SD: standard deviation.

Knee » Patient characteristics » Age category 2010-2019

FIGURE Trend (proportion [%] per year) in age category in primary total knee arthroplasties in the Netherlands in 2010-2019

Year

Age category (%)

<50

2.63

2.89

2.79

2.64

2.38

2.41

2.01

2.20

1.77

1.50

2.28

50-59

14.92

14.82

15.57

15.06

14.75

14.89

14.39

14.37

13.98

13.15

14.55

60-69

34.49

34.61

35.86

36.68

37.10

36.07

36.51

35.07

34.14

34.19

35.48

70-79

34.33

34.53

33.65

33.99

34.14

35.06

35.86

36.72

38.33

39.69

35.77

>80

13.63

13.15

12.13

11.63

11.58

11.23

11.65

11.78

11.46

11.91

Total (n):

232,474

18,484

19,483

21,673

22,269

24,214

24,236

24,865

25,553

25,842

25,855

TKA: total knee arthroplasty.

Knee » Patient characteristics » Previous surgery 2014-2019

TABLE Trend (proportion [%] per year) in previous surgeries to the same joint in patients who underwent a primary knee arthoplasty in the Netherlands in 2014-2019

Year	2014	2015	2016	2017	2018	2019	Total
Primary knee arthroplasty (n)	26,033	26,477	27,806	29,297	28,258	27,982	165,853
Previous surgery to the relevant knee (total) Proportion¹ (%)	35.7	34.5	33.4	28.0	25.2	24.5	30.1
Meniscectomy	28.4	27.3	26.6	22.3	20.6	19.9	24.1
Arthroscopy	17.7	18.9	19.3	17.1	15.6	15.3	17.3
Osteotomy	3.0	3.0	2.8	2.9	2.8	2.5	2.8
Osteosynthesis	1.7	1.7	1.4	1.5	1.5	1.6	1.6
ACL reconstruction	1.3	1.5	1.5	1.5	1.4	1.5	1.5
Synovectomy	1.2	1.2	1.0	0.8	0.6	0.6	0.9
Other	3.3	2.9	3.1	3.0	3.0	3.4	3.1

¹ A patient may have undergone multiple previous surgeries to the same joint. As such, the total proportion is more than the total proportion of patiens with one or more previous surgeries to the same joint.

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