Comparing the Relative Stability of Anterior Lumbar Interbody Fusion (ALIF) Constructs

Biomechanical testing was performed at the Barrow Neurological Institute on seven human cadaveric L3-S1 specimens with a mean age 56 years with mean bone density 0.839 g/cm². Pure moments (±7.5 Nm) were applied in each plane while recording angular motion optoelectronically. Each specimen was tested using an intact disc and five different constructs.

Considerations for ALIF Surgery

• Within the results of this study, the Aspen device demonstrated similar range of motion to more invasive bilateral pedicle screws-rods
• Demonstrating comparable relative stability, the minimally invasive Aspen device may be a viable option for posterior support with ALIF surgery
• Allowing less ROM than anterior plate fixation, the Aspen implant offers an alternative fixation method

Study Results

• Each construct was demonstrated to be effective at reducing angular range of motion (ROM)
• The Aspen device was most effective in limiting flexion and extension
• ALIF with Aspen provided stability that was equivalent to ALIF with bilateral pedicle screws-rods (p>0.37, RM-ANOVA/Holm-Sidak)
• ALIF with Aspen allowed less ROM than ALIF

To learn more about the biomechanical testing results, please contact your local
Lanx representative.