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Patient characteristics

By type of knee prosthesis
By diagnosis

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 2022

	TKA	UKA	PFA	Total¹
N (%)	26,708 (79)	6,972 (21)	116 (0)	33.822
Mean age (years) (SD)	69.6 (8.7)	65.6 (8.7)	55.0 (9.9)	68.7 (8.9)
Age (years) (%)
<50	1	3	30	2
50-59	13	24	41	15
60-69	32	38	20	33
70-79	42	30	7	39
≥80	12	5	2	11
Gender (%)
Men	38	46	26	40
Women	62	54	74	60
ASA score (%)
I	10	16	32	11
II	64	67	58	65
III-IV	26	17	10	24
Type of hospital (%)
General	78	69	70	76
UMC	1	0	2	1
Private	21	31	28	23
Diagnosis (%)
Osteoarthritis	97	99	98	97
Post-traumatic	2	0	2	1
Rheumatoid arthritis	1	0	0	1
Osteonecrosis	0	1	0	1
Other	0	0	0	0
Charnley-score (%)
A One knee joint affected	36	44	37	38
B1 Both knee joints affected	36	35	42	36
B2 Contralateral knee joint with a total knee prosthesis	24	19	17	23
C Multiple joints affected or chronic disease that affects quality of life	4	2	4	3
Mean Body Mass Index (kg/m²) (SD)	29.4 (4.9)	29.0 (4.4)	28.2 (4.5)	29.3 (4.8)
Body Mass Index (kg/m²) (%)
Underweight (≤18,5)	0	0	0	0
Normal weight (>18,5-25)	19	19	25	19
Overweight (>25-30)	41	45	44	42
Obesity (>30-40)	37	34	30	36
Morbid obesity (>40)	3	2	1	3
Smoking (%)
No	93	92	90	93
Yes	7	8	10	7

¹ Contains 26 (0.1%) primary knee arthroplasties of which the type of prosthesis was not 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 2022

	Osteoarthritis	Post-traumatic	Rheumatoid arthritis	Osteonecrosis	Total¹
N (%)	32,712 (97)	396 (1)	275 (1)	165 (0)	33.822
Mean age (years) (SD)	68.8 (8.8)	64.1 (10.3)	65.6 (10.1)	69.7 (10.7)	68.7 (8.9)
Age (years) (%)
<50	1	6	6	4	2
50-59	15	31	20	16	15
60-69	34	31	37	22	33
70-79	39	24	32	42	39
≥80	11	8	5	16	11
Gender (%)
Men	40	50	27	35	40
Women	60	50	73	65	60
ASA score (%)
I	12	15	2	9	11
II	64	66	68	60	65
III-IV	24	19	30	31	24
Type of hospital (%)
General	76	77	81	80	76
UMC	1	4	7	0	1
Private	23	19	12	20	23
Charnley-score (%)
A One knee joint affected	38	70	24	74	38
B1 Both knee joints affected	36	19	36	12	36
B2 Contralateral knee joint with a total knee prosthesis	23	7	21	9	23
C Multiple joints affected or chronic disease that affects quality of life	3	4	19	5	3
Mean Body Mass Index (kg/m²) (SD)	29.4 (4.8)	28.4 (4.8)	28.0 (4.6)	28.4 (4.6)	29.3 (4.8)
Body Mass Index (kg/m²) (%)
Underweight (≤18,5)	0	1	1	0	0
Normal weight (>18,5-25)	19	26	31	24	19
Overweight (>25-30)	42	40	38	47	42
Obesity (>30-40)	36	31	29	26	36
Morbid obesity (>40)	3	2	1	3	3
Smoking (%)
No	93	88	89	91	93
Yes	7	12	11	9	7

Please note: in 2022, 144 (0.4%) patients had a primary knee arthroplasty after a diagnosis that is not listed in the table. Of 130 (0.4%) primary knee arthroplasties the diagnosis was not registered.
General: general hospital; UMC: university medical centre; Private: private hospital; SD: standard deviation.