Jaarrapportage Knee Patient characteristics

Patient characteristics

TABLE Patient characteristics of all patients with a registered primary knee arthroplasty by type of knee arthroplasty in the Netherlands in 2023

	TKA	UKA	PFA	Total
N(%)	28,286 (77.8)	7,903 (21.8)	126 (0.4)	36,351
Mean age (years) (SD)	69.6 (8.8)	66 (8.6)	57.4 (11.2)	68.8 (8.9)
Age (years) (%)
<50	1	2	25	1
50-59	13	22	35	15
60-69	32	39	22	34
70-79	42	31	16	39
>80	12	5	2	11
Gender (%)
Men	39	46	23	40
Women	61	54	77	60
ASA score (%)
ASA I	9	13	19	10
ASA II	63	67	69	64
ASA III-IV	28	20	12	26
Type of hospital (%)
General	79	71	60	77
UMC	1	0	2	1
Private	20	29	38	22
Diagnosis (%)
Osteoarthritis	97	98	98	97
Post-traumatic	1	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	45	43	38
B1 Both knee joints affected	36	33	40	35
B2 Contralateral knee with a TKA	24	20	16	23
C Multiple joints affected or chronic disease that affects quality of life	4	2	1	4
Mean BMI (kg/m ) (SD)	29.5 (5.0)	29.1 (4.4)	28.7 (4.0)	29.4 (4.8)
Body Mass Index (kg/m ) (%)
Underweight (<=18.5)	0	0	0	0
Normal weight (>18.5-25)	19	18	16	19
Overweight (>25-30)	41	43	49	42
Obesity (>30-40)	36	35	33	37
Morbid obesity (>40)	3	1	1	3
Smoking (%)
No	92	91	88	93
Yes	7	8	11	7

Total contains 36 (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.

TABLE Patient characteristics of all patients with a registered primary knee arthroplasty by type of diagnosis in the Netherlands in 2023

	Osteoarthritis	Post-traumatic	Rheumatoid arthritis	Osteonecrosis	Other	Total
N(%)	35,211 (96.8)	412 (1.2)	223 (0.6)	195 (0.6)	310 (0.8)	36,351
Mean age (years) (SD)	68.9 (8.8)	64.2 (11.1)	65.1 (11.6)	69 (10.7)	65.3 (14.0)	68.8 (8.9)
Age (years) (%)
<50	1	8	9	3	9	1
50-59	15	26	18	17	18	15
60-69	34	34	29	27	30	34
70-79	40	22	39	37	30	39
>80	11	10	4	15	13	11
Gender (%)
Men	40	43	26	41	39	40
Women	60	57	74	59	61	60
ASA score (%)
ASA I	10	13	1	9	6	10
ASA II	64	64	70	63	55	64
ASA III-IV	26	23	29	28	28	26
Type of hospital (%)
General	77	69	87	79	62	77
UMC	1	8	4	4	15	1
Private	22	23	8	17	23	22
Charnley-score (%)
A One knee joint affected	37	75	20	73	44	38
B1 Both knee joints affected	35	14	33	14	20	35
B2 Contralateral knee with a TKA	23	7	23	10	9	23
C Multiple joints affected or chronic disease that affects quality of life	4	5	24	3	5	4
Mean BMI (kg/m ) (SD)	29.4 (4.8)	28 (4.8)	28.1 (5.5)	27.8 (4.5)	28.8 (5.2)	29.4 (4.8)
Body Mass Index (kg/m ) (%)
Underweight (<=18.5)	0	0	1	1	1	0
Normal weight (>18.5-25)	18	30	29	29	19	19
Overweight (>25-30)	41	41	39	43	30	42
Obesity (>30-40)	36	27	27	26	29	37
Morbid obesity (>40)	3	1	2	1	2	3
Smoking (%)
No	92	90	91	89	73	93
Yes	7	9	9	10	14	7

Please note: diagnosis 'Other' (310: 1%) includes other (59), inflammatory arthritis (55), fracture (acute) (19), tumour (metastasis) (4), tumour (primary) (22) and 151 primary knee arthroplasties where the diagnosis was not registered.
General: general hospital; UMC: university medical centre; Private: private hospital; SD: standard deviation