Biomechanical comparison of unilateral and bilateral pedicle screws fixation for oblique lumbar inter-body fusion surgery - a finite element analysis.

OLIF surgery with BPSF could reduce the maximum stresses on the endplate, which may reduce the incidence of cage subsidence. OLIF surgery with the SA method produced more stress than BPSF, especially in extension and flexion motion, which may be a potential risk factor for cage subsidence.