Table 2 Comparison of pre- and postoperative radiographic outcomes.

From: Radiologic and clinical outcomes of combining pedicle subtraction osteotomy and Smith–Peterson osteotomy in correcting severe ankylosing spondylitis kyphosis

Radiographic parameters

Preoperative

Postoperative

Final follow-up

Correction

Loss of correction

TK (deg)

44.6 ± 18.3

41.3 ± 17.7

46.7 ± 16.9

3.3 ± 10.1

5.4 ± 9.2

LL (deg)

10.4 ± 21.6

− 46.4 ± 15.3*

− 47.3 ± 15.3

56.7 ± 17.7

− 1.0 ± 9.3

GK (deg)

99.8 ± 21.4

30.5 ± 16.1*

29.7 ± 19.6

69.3 ± 23.2

− 0.8 ± 12.8

PSO-OVA (deg)

9.6 ± 5.6

− 24.0 ± 9.6*

− 21.3 ± 9.4

33.6 ± 9.2

2.7 ± 6.4

SPO-OVA (deg)

5.3 ± 10.5

− 20.7 ± 8.2*

− 20.1 ± 11.0

26.0 ± 13.2

0.6 ± 14.3

PI (deg)

42.5 ± 9.3

48.4 ± 14.1

43.8 ± 5.6

− 4.2 ± 12.2

− 4.6 ± 9.1

PT (deg)

35.7 ± 16.6

24.5 ± 15.3

23.1 ± 10.3

9.0 ± 26.2

− 1.4 ± 13.4

SS (deg)

6.7 ± 9.9

23.9 ± 8.9*

20.7 ± 7.5

− 20.2 ± 12.6

− 3.2 ± 9.7

SVA (mm)

235.1 ± 123.8

62.9 ± 46.1*

51.5 ± 37.5

173.0 ± 112.0

− 11.4 ± 56.1

  1. *Compared with preoperative values, P < 0.05.
  2. TK T5–T12 kyphosis, LL L1–S1 lordosis, GK global kyphosis, PSO pedicle subtraction osteotomy, SPO Smith–Petersen osteotomy, OVA osteotomized vertebral angle, PI pelvic incidence, PT pelvic tilt, SS sacral slope, SVA sagittal vertical axis.
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