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10 Cards in this Set
- Front
- Back
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What is the function of the anterior column and the posterior column?
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Anterior column: support
Posterior column: tension band |
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An anteriorly placed graft is loaded in which two directions and unloaded in which two directions?
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Loaded in compression, flexion
Unloaded in extension, traction |
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What effect does an anterior plate have on the axis of rotation?
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Moves axis of rotation anteriorly
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. . . on the graft in extension?
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Loads graft in extension
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. . . on the graft in flexion?
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Unloads graft in flexion
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What is the definition of terminal bending?
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Moments at end of a long construct
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How can terminal bending be prevented?
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With intermediate fixation points
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How much lumbar torsional resistance is provided by facets, disk, and ligaments?
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Facets: 40%
Disks: 40% Ligaments: 20% |
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After a flexion-distraction injury, what is the status of the anterior longitudinal ligament (ALL) and posterior longitudinal ligament (PLL disrupted)?
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ALL intact
PLL out |
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Which approach is biomechanically superior in this situation?
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Posteriorly based fusions are superior to anteriorly based fusions
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