Demographics

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 2019

  Osteoarthritis (n=106) No osteoarthritis¹  (n=21) Total (n=127)
Mean age (years) (SD) 68.1 (8.4) 62.6 (13.3) 67.2 (9.5)
Age (years) (%)
  <50 2 19 5
  50-59 16 24 17
  60-69 35 10 30
  70-79 38 38 38
  ≥80 9 9 10
Gender (%)
  Men 62 43 59
  Women 38 57 41
ASA score (%)
  I 15 24 17
  II 70 71 70
  III-IV 15 5 13
Type of hospital (%)
  General 62 71 64
  UMC 8 10 8
  Private 30 19 28
Charnley-score (%)
  A One ankle joint affected 70 69 70
  B1 Both ankle joints affected 13 5 12
  B2 Contralateral ankle joint with a total ankle prosthesis 9 0 7
  C Multiple joints affected or chronic disease that affects quality of life 8 26 11
Mean Body Mass Index (kg/m²) (SD) 27.7 (4.2) 26.3 (4.3) 27.4 (4.2)
Body Mass Index (kg/m²) (%)
  Underweight (≤18,5) 0 0 0
  Normal weight (>18,5-25) 29 33 30
  Overweight (>25-30) 46 43 45
  Obesity (>30-40) 23 24 23
  Morbid obesity (>40) 2 0 2
Smoking (%)
  No 92 89 92
  Yes 8 11 8

¹ Another diagnosis than osteoarthritis registered as primary diagnosis, specifically post-traumatic (9%), rheumatoid arthritis (4%), inflammatory arthritis (2%), tumour (1%) or other primary diagnosis (2%).
General: general hospital; UMC: university medical centre; Private: private hospital; SD: standard deviation.

© LROI 2020

Ankle » Primary ankle arthroplasty » Demographics » Age category 2014-2019

FIGURE Trend (proportion [%] per year) in age category in primary ankle arthroplasties in the Netherlands in 2014-2019

Year

Age category (%)

<50
5.83
4.76
4.55
6.09
2.05
4.72
4.53
4.53

50-59
26.21
28.57
25.76
13.91
15.75
17.32
20.88
20.88

60-69
29.13
42.86
42.42
43.48
40.41
30.71
38.32
38.32

70-79
34.95
22.86
22.73
32.17
39.04
37.80
31.87
31.87

>80
3.88
0.95
4.55
4.35
2.74
9.45
4.40
4.40


Total (n):
728
103
105
132
115
146
127

AA: ankle arthroplasty.

© LROI 2020

Ankle » Primary ankle arthroplasty » Demographics » Previous surgery 2016-2019

TABLE Trend (proportion [%] per year) in previous surgeries to the same joint in patients who underwent a primary ankle arthoplasty in the Netherlands in 2016-2019

Year 2016 2017 2018 2019 Total
Primary ankle arthroplasty (n) 125 113 144 126 508
Previous surgery to the relevant ankle (total);
Proportion¹ (%)
31.2 28.3 29.9 33.3 30.7
Osteosynsthesis 13.6 16.8 9.7 11.9 12.8
Hindfoot surgery 6.4 3.5 12.5 7.9 7.9
Arthroscopy 7.2 11.5 5.6 4.8 7.1
Arthrodesis 4.0 1.8 5.6 4.0 3.9
Osteotomy 2.4 1.8 1.4 7.9 3.4
Ligament reconstruction 1.6 1.8 0.7 3.2 1.8
Synovectomy 1.6 2.7 0.7 2.4 1.8
Treatment of osteochondral bone defect 1.6 2.7 1.4 0.0 1.4
Forefoot surgery 2.4 0.0 1.4 0.0 1.0
Other 4.8 2.7 3.5 7.1 4.5

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 patients with one or more previous surgeries to the same joint.

© LROI 2020