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Table 2 Independent demographic, phenotypic, and treatment variables possibly influencing postoperative TPPR Increase.

From: Transverse plane pelvic rotation increase (TPPRI) following rotationally corrective instrumentation of adolescent idiopathic scoliosis double curves

Variable

All

Patients

N = 17

No TPPR

Increase

N = 10

TPPR

Increase

N = 7

P

Age at surgery (years)

14.5

± 2.39

15.1

± 2.86

13.6

± 1.22

nsa

Risser sign

0

5

2

3

nsb

1

0

0

0

 

2

6

4

2

 

3

1

1

0

 

4

3

1

2

 

5

2

2

0

 

Sex

   Females

15

8

7

nsb

   Males

2

2

0

 

Curve Pattern

   Lenke 3

7

4

3

nsb

   Lenke 6

10

6

4

 

Curve Orientation

   Rt. T - Lt TL/L

14

10

4

p = 0.051b

   Lt. T - Rt. TL/L

3

0

3

 

Case Sequence (1 through 17)

9

±5.05

8.5

± 4.93

9.7

± 5.53

nsb

Supplemental, Sequential Anterior Discectomy and Arthrodesis, without Instrumentation

   No

5

5

0

p = 0.044b

   Yes

12

5

7

 

Upper Instrumented Vertebra (UIV): Lower Instrumented (LIV) & End Vertebra (LEV)

   UIV T3

14

10

4

nsb

T4 or T5

3

0

3

 

   LIV L2

2*

1*

1*

nsb

L3

15**

9**

6

 

   LEV L3

10***

6*

4*

nsb

L4

7**

4**

3

 
  1. * Two had 4 lumbar vertebrae ** One had 6 lumbar vertebrae *** Two had 4 lumbar vertebrae (one each in the no-TPPRI and TPPRI groups)
  2. a Two-tailed Wilcoxon rank-sum test
  3. b Fisher Exact or Chi-square test