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Table 1 Screw pullout strength (numbers in Newton) for every screw type in each vertebral body in the three spine specimens tested

From: Axial pullout strength comparison of different screw designs: fenestrated screw, dual outer diameter screw and standard pedicle screw

Vertebral level Spine specimen 1 64y, male BMD = 0,774 g/cm2 Spine Specimen 2 60y, female BMD = 0,649 g/cm2 Spine Specimen 3 70y, male BMD = 0,762 g/cm2
Left pedicle Right pedicle Left pedicle Right pedicle Left pedicle Right pedicle
T10 1710 (FSP) 1073 (DOD) R R R R
T11 947 (FS) 868 (SS) 326 (SS) 521 (FS) 582 (SS) 873 (FS)
T12 1628 (FSP) 785 (DOD) 927 (DOD) 1098 (FSP) 989 (SS) 762 (FS)
L1 727 (FS) 858 (SS) 763 (SS) 345 (FS) 1509 (FSP) 620 (DOD)
L2 1588 (FSP) 1067 (DOD) 623 (DOD) 1225 (FSP) 560 (FS) 435 (SS)
L3 605 (FS) 704 (SS) 274 (SS) 302 (FS) 898 (DOD) 1555 (FSP)
L4 1199 (FSP) 800 (DOD) 430 (DOD) 1499 (FSP) 1245 (DOD) 1692 (FSP)
L5 R R 301 (SS) 265 (FS) R R
  1. FS = Fenestrated Screw; SS = Standard Screw; DOD = Dual Outer Diameter Screw; FSP = Fenestrated Screw with PMMA; R = Removed.