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Table 2 Comparisons on cervical alignment parameters among ACDF, HS1, and HS2

From: Exploration on sagittal alignment and clinical outcomes after consecutive three-level hybrid surgery and anterior cervical discectomy and fusion: a minimum of a 5-year follow-up

 

ACDF

HS1

HS2

P

CL at pre-op (°)

6.8 ± 14.3

12.1 ± 11.0

9.7 ± 15.5

0.231

CL at 1 week later (°)

11.1 ± 10.2

14.7 ± 9.1

16.2 ± 10.0a

0.237

CL at final follow-up (°)

12.6 ± 9.0b

16.3 ± 7.4b

18.9 ± 11.7b

0.113

ΔCL (°)

5.9 ± 10.9

4.2 ± 9.3

9.2 ± 12.1

0.538

SVA at pre-op (cm)

2.0 ± 1.0

1.5 ± 1.1

1.8 ± 0.7

0.088

SVA at 1 week later (cm)

2.6 ± 1.3

2.2 ± 1.0

2.4 ± 0.5

0.375

SVA at final follow-up (cm)

1.9 ± 1.2

1.7 ± 1.1

1.9 ± 1.5

0.738

ΔSVA (cm)

− 0.1 ± 1.0

0.3 ± 0.9

0.1 ± 1.4

0.406

T1S at pre-op (°)

24.1 ± 8.4

24.0 ± 8.2

22.1 ± 3.9

0.881

T1S at 1 week later (°)

26.1 ± 8.0

26.7 ± 7.9

28.2 ± 6.8aa

0.851

T1S at final follow-up (°)

26.0 ± 7.3

26.7 ± 7.4

26.4 ± 2.6b

0.908

ΔT1S (°)

1.9 ± 8.7

2.7 ± 5.9

4.3 ± 2.1

0.745

T1SCL at pre-op (°)

17.3 ± 9.9

11.9 ± 9.7

12.5 ± 13.7

0.081

T1SCL at 1 week later (°)

15.1 ± 8.9

11.9 ± 9.0

12.0 ± 13.3

0.360

T1SCL at final follow-up (°)

13.3 ± 9.9

10.4 ± 7.7

7.2 ± 9.3

0.216

ΔT1SCL (°)

− 4.0 ± 10.0

− 1.5 ± 9.6

− 5.2 ± 13.2

0.506

  1. ACDF anterior cervical discectomy and fusion, HS hybrid surgery, HS1 one prosthesis and two cages, HS2 two prostheses and one cage, CL C2–C7 cervical lordosis, Pre-op preoperation, SVA C2–C7 sagittal vertical axis, T1S T1 slope, T1SCL T1S minus CL
  2. “Δ” is the change of variable at final follow-up compared to baseline
  3. aSignificance on parameters between pre-op and 1 week after surgery (P < 0.05)
  4. aaSignificance on parameters between pre-op and 1 week after surgery (P < 0.01)
  5. bSignificance on parameters between pre-op and final follow-up (P < 0.05)
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Journal of Orthopaedic Surgery and Research

ISSN: 1749-799X