Table 4 Number of knees with postoperative complications in the HD and non-HD groups

 0–12 months

13 (61.9)

20 (28.2)

0.0085

4.14

1.49–11.51

 12–24 months

7 (33.3)

7 (9.9)

0.0149

4.57

1.38–15.13

 0–1 month

10 (47.6)

12 (16.9)

0.0074

4.47

1.55–12.87

 1–2 months

2 (9.5)

1 (1.4)

0.1293

7.37

0.63–85.68

 2–3 months

0 (0.0)

0 (0.0)

N/A

N/A

N/A

 3–4 months

2 (9.5)

2 (2.8)

0.2227

3.63

0.48–27.50

 4–5 months

0 (0.0)

0 (0.0)

N/A

N/A

N/A

 5–6 months

2 (9.5)

1 (1.4)

0.1293

7.37

0.63–85.68

 6–7 months

0 (0.0)

0 (0.0)

N/A

N/A

N/A

 7–8 months

1 (4.8)

2 (2.8)

0.5449

1.73

0.15–20.02

 8–9 months

1 (4.8)

0 (0.0)

0.2283

N/A

N/A

 9–10 months

1 (4.8)

0 (0.0)

0.2283

N/A

N/A

 10–11 months

1 (4.8)

1 (1.4)

0.4064

3.50

0.21–58.48

 11–12 months

2 (9.5)

4 (5.6)

0.6166

1.76

0.30–10.37

 12–13 months

1 (4.8)

0 (0.0)

0.2283

N/A

N/A

 13–14 months

0 (0.0)

1 (1.4)

1.0000

N/A

N/A

 14–15 months

0 (0.0)

0 (0.0)

N/A

N/A

N/A

 15–16 months

0 (0.0)

1 (1.4)

1.0000

N/A

N/A

 16–17 months

0 (0.0)

1 (1.4)

1.0000

N/A

N/A

 17–18 months

2 (9.5)

0 (0.0)

0.0502

N/A

N/A

 18–19 months

1 (4.8)

0 (0.0)

0.2283

N/A

N/A

 19–20 months

0 (0.0)

0 (0.0)

N/A

N/A

N/A

 20–21 months

0 (0.0)

0 (0.0)

N/A

N/A

N/A

 21–22 months

2 (9.5)

2 (2.8)

0.2227

3.63

0.48–27.50

 22–23 months

0 (0.0)

1 (1.4)

1.0000

N/A

N/A

 23–24 months

2 (9.5)

2 (2.8)

0.2227

3.63

0.48–27.50

 0–24 months

13 (61.9)

25 (35.2)

0.0429

2.99

1.09–8.18

 Beyond two years

12 (57.1)

21 (29.6)

0.0364

3.17

1.16–8.66