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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