Pedicle screw instrumentation of thoracolumbar burst fractures: Biomechanical evaluation of screw configuration with pedicle screws at the level of the fracture

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Fig. 1
Specimen mounted on test machine for burst fracture creation.
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Fig. 2
Static compression summary chart of the 8 calf specimens tested.
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Fig. 3
Lateral radiographs of a sample specimen after fracture creation (L1).
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Fig. 4
The 3 different instrumented constructs that were compared for stabilization after burst fracture (BF I or BF II) and with and without pedicle screws at the level of the fracture. A, SSPF with screw at fractured level (SSPF + SF). B, SSPF. C, LSPF.
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Fig. 5
L1-L3 ROM in FE, LB, and AR for different surgical constructs tested, expressed as percentage of intact ROM.

Table 1

Mean ROM at L1-3 in FE, LB, and AR

NOTE. All of the instrumented constructs significantly reduced the mean ROM compared with stable (BF I) and unstable (BF II) constructs in FE and LB. No significant differences were found within the instrumented constructs in any of the loading conditions.
↵* Significant compared with intact condition.