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Demographics

Patient characteristics by diagnosis

Ankle » Primary ankle arthroplasty » Demographics » Patient characteristics by diagnosis

TABLE Patient characteristics of all patients with a registered primary ankle arthroplasty by diagnosis in the Netherlands in 2021

	Osteoarthritis (n=109)	No osteoarthritis¹ (n=13)	Total (n=122)
Mean age (years) (SD)	70.6 (7.2)	62.7 (8.8)	69.7 (7.7)
Age (years) (%)
<50	1	8	2
50-59	5	31	7
60-69	34	31	34
70-79	51	31	49
≥80	9	0	8
Gender (%)
Men	56	69	57
Women	44	31	43
ASA score (%)
I	12	8	11
II	78	69	77
III-IV	10	23	11
Type of hospital (%)
General	62	92	66
UMC	0	0	0
Private	38	8	34
Charnley-score (%)
A One ankle joint affected	63	92	66
B1 Both ankle joints affected	18	0	16
B2 Contralateral ankle joint with a total ankle prosthesis	2	0	2
C Multiple joints affected or chronic disease that affects quality of life	17	8	16
Mean Body Mass Index (kg/m²) (SD)	27.6 (4.2)	27.7 (4.3)	27.6 (4.2)
Body Mass Index (kg/m²) (%)
Underweight (≤18,5)	0	0	0
Normal weight (>18,5-25)	28	23	28
Overweight (>25-30)	52	62	53
Obesity (>30-40)	18	15	18
Morbid obesity (>40)	1	0	1
Smoking (%)
No	94	92	93
Yes	6	8	7

¹ Another diagnosis than osteoarthritis registered as primary diagnosis, specifically post-traumatic (n=9), rheumatoid arthritis (n=3) or other primary diagnosis (n=1).
General: general hospital; UMC: university medical centre; Private: private hospital; SD: standard deviation.