Monoaxial Pedicle Screws Are Superior to Polyaxial Pedicle Screws and the Two Pin External Fixator for Subcutaneous Anterior Pelvic Fixation in a Biomechanical Analysis
Figure 4
(a) Load displacement curves for axial testing which show that the polyaxial systems failed after 40 mm of displacement. (b) The polyaxial screws were slightly less stiff than the monoaxial system and all three-screw systems were stiffer than the external fixator.
