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Table 2 Results of flexibility and load sharing tests for the treated lumbar specimens

From: The role of cage height on the flexibility and load sharing of lumbar spine after lumbar interbody fusion with unilateral and bilateral instrumentation: a biomechanical study

  

Long cage

Short cage

P-value*

Flexion and extension ROM (deg)a

Intact spineb

6.39(2.15)

 

Cage alone

4.61(1.25)

9.14(2.92)

0.002

UPS

2.23(0.75)

3.90(1.31)

0.004

BPS

1.23(0.53)

1.30(0.51)

0.686

Lateral bending ROM (deg)a

Intact spineb

6.71(1.79)

 

Cage alone

6.55(2.30)

11.92(3.53)

<0.001

UPS

4.19(1.76)

7.7(1.95)

0.005

BPS

1.30(0.52)

1.35(0.40)

0.698

Axial rotation ROM (deg)a

Intact spineb

2.24(1.00)

 

Cage alone

3.55(1.10)

7.7(1.88)

<0.001

UPS

1.49(0.44)

4.1(1.09)

<0.001

BPS

1.07(0.34)

1.24(0.44)

0.133

Load sharing (%)a

Intact spineb

 

Cage alone

79.91(10.03)

66.28(11.28)

0.022

UPS

35.80(8.94)

28.12(6.20)

0.020

BPS

21.57(8.70)

9.90(3.61)

0.022

  1. UPS unilateral pedicle screw fixation, BPS bilateral pedicle screw fixation
  2. *P value: Paired t test between Long and Short cage
  3. aThe data are given as mean, with standard deviation in parentheses
  4. bThe intact spine specimens were tested without a fusion cage implanted