Table 2 Univariate analysis of the risk factors for vertebral compression fractures

No. of flaps

17

65

Mean age, y

45.9 ± 9.3

41.0 ± 10.8

0.094^a

Mean body mass index, kg/m2

22.7 ± 3.1

22.3 ± 3.0

0.619^a

Sex

0.873^b

 Male

8

32

 Female

9

33

Location

0.676^b

 Middle tibia

5

15

 Lower tibia

7

26

 Lateral malleolus

3

8

 Medial malleolus

2

16

Arc of rotation

0.010^b

  < 150

4

38

 150–180

13

27

Diabetes mellitus

0.693^b

 Yes

3

9

 No

14

56

Smoking

0.562^b

 Yes

6

28

 No

11

37

Distance from perforator to center of defect

8.4 ± 2.3

9.4 ± 2.6

0.151^c

Nearest distance from perforator to defect location

3.0 ± 0.9

3.8 ± 1.0

0.005^c

Time from injury to definitive surgical procedure (days)

11.2 ± 4.2

10.0 ± 3.5

0.220^c

Operative time (min)

160.3 ± 23.7

166.5 ± 18.7

0.256^c

Length(cm)

12.4 ± 3.2

11.8 ± 3.7

0.573^c

Width(cm)

5.6 ± 2.1

6.2 ± 1.4

0.428^c

Flap Size(cm)

62.5 ± 14.6

58.9 ± 13.5

0.317^c

length–width ratio

2.9 ± 0.9

2.7 ± 1.1

0.182^c