Mechanical stability of thoracolumbar pedicle screw fixation. The effect of crosslinks.

Abstract:

STUDY DESIGN:Pedicle screw fixation for unstable thoracolumbar spine injuries is relatively new. The effect of one or two crosslinks on rotational and lateral bending stiffness was studied. OBJECTIVE:To determine the rotational and bending stiffness values of thoracolumbar fractures fixed by the AO's internal fixation system with zero, one, or two crosslinks. METHODS:Eight embalmed thoracolumbar spine segments. (T12-L2) were instrumented at T12 and L2 with a pedicle screw-rod system. Rotational stiffness was determined for 10 cycles to 2.5 degrees, 3.5 degrees, and 5 degrees of rotation, with and without one or two crosslinks, and lateral bending stiffness for 10 cycles to 0.25, 0.40, and 0.50 inch. The results showed a clear trend toward increased stiffness with crosslinks. RESULTS:The stiffness values of the two-crosslink construct at 2.5 degrees and 3.5 degrees of rotation were significantly higher than those of the zero-crosslink system. Also, the bending stiffness of the two-crosslink construct was significantly higher than that of no-crosslink system at all of the displacements. CONCLUSIONS:Rotational stiffness values of the two-crosslink construct were significantly higher than those of the zero-crosslink system, at 2.5 degrees and 3.5 degrees of rotation. Lateral bending stiffness of the two-crosslink system was higher than that of the zero-crosslink system at all levels of displacement.

journal_name

Spine (Phila Pa 1976)

journal_title

Spine

authors

Lynn G,Mukherjee DP,Kruse RN,Sadasivan KK,Albright JA

doi

10.1097/00007632-199707150-00007

subject

Has Abstract

pub_date

1997-07-15 00:00:00

pages

1568-72; discussion 1573

issue

14

eissn

0362-2436

issn

1528-1159

journal_volume

22

pub_type

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