From: Biomechanical evaluation of monosegmental pedicle instrumentation in a calf spine model and the role of fractured vertebrae in screw stability
Parameter
Fractured vertebrae
Intact vertebrae
% Decrease
P value
Maximal insertional torque (Nm)
0.29(0.13)
0.40(0.15)
27.5
0.001
Seating torque in (Nm)
0.23(0.11)
0.28(0.13)
17.9
0.04
Axial pullout strength (N)
558(305)
646(266)
13.7
0.06