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Table 3 Mean sagittal parameters measured on supine low dose CT scans before surgery and at 2 years after surgery for subgroups of patients who were classified preop as being (i) hypo-kyphotic (HK, n = 17) or (ii) Normo-kyphotic (NK, n = 13)

From: CT and radiographic analysis of sagittal profile changes following thoracoscopic anterior scoliosis surgery

Sagittal Cobb angle (°)

Before Surgery (± sd)

2 years postop (± sd)

Difference (°)

 

Hypo

Norm

Hypo

Norm

Hypo (−)

Norm (N)

T5 - T12

6.6 ± 7.3

15.5 ± 3.7

18.6 ± 8.5

28.3 ± 8.5

+12.0*

+12.8*

T2 - T12

13.4 ± 6.2

25.2 ± 6.6

22.5 ± 8.4

32.2 ± 8.28

+ 9.1*

+ 7.0*

Instrumented Levels

5.3 ± 7.8

11.9 ± 3.8

18.5 ± 9.1

27.2 ± 8.5

+13.2*

+15.3*

T2 - T5

6.8 ± 5.1

9.7 ± 5.5

4.0 ± 5.4

3.9 ± 4.8

- 2.8*

- 5.8*

T10 - L2

0.7 ± 8.4

3.0 ± 5.5

2.6 ± 8.1

4.0 ± 7.2

+ 1.9

+ 1.0

Distal to Rod

1.3 ± 3.9

3.1 ± 6.2

2.1 ± 3.7

3.4 ± 5.7

+ 0.8

+ 0.3

T12 - S1

−49.5 ± 8.4

−53.3 ± 7.4

−55.0 ± 11.0

−61.9 ± 10.6

+ 5.5*

+ 8.6*

  1. * indicates statistically significant difference between pre-operative and 2 year post-operative kyphosis measures (paired t-test, P < 0.05). No statistically significant differences were found between the HK and NK groups in terms of pre to postop changes for any of the sagittal Cobb measures (unpaired t-test, p < 0.05).