Table 1 Demographic data of patients

Number of patients

21

20

Age, mean ± SD

70.7 ± 7.3

70.0 ± 7.4

0.758

Sex, number

  Male

6

5

0.796

  Female

15

15

Medical history (months), mean ± SD

5.6 ± 2.9

5.6 ± 2.8

0.981

BMD, mean ± SD

− 3.5 ± 0.4

− 3.3 ± 0.5

0.386

Responsible segment, number

 T10

1

1

0.951

 T11

0

1

 T12

2

2

 L1

11

9

 L2

4

5

 L3

2

1

 L4

1

1

Follow-up (months), mean ± SD

37.7 ± 7.7

39.6 ± 5.1

0.355