In flexion-extension radiographs, what magnitude of anterior-posterior vertebral translation is considered a sign of lumbar instability?

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Multiple Choice

In flexion-extension radiographs, what magnitude of anterior-posterior vertebral translation is considered a sign of lumbar instability?

Excessive forward motion between adjacent lumbar segments on flexion-extension radiographs signals instability. The threshold commonly used to define a sign of instability is about four millimeters of anterior translation. When a segment translates by this amount or more, it suggests the passive stabilizers (ligaments and facet joints) aren’t restraining motion adequately, which can correspond to symptomatic instability. Smaller motions, like around two millimeters, are often within normal variation, while larger translations (six to eight millimeters) indicate more pronounced instability but are less often cited as the standard cut-off in tests.

Excessive forward motion between adjacent lumbar segments on flexion-extension radiographs signals instability. The threshold commonly used to define a sign of instability is about four millimeters of anterior translation. When a segment translates by this amount or more, it suggests the passive stabilizers (ligaments and facet joints) aren’t restraining motion adequately, which can correspond to symptomatic instability. Smaller motions, like around two millimeters, are often within normal variation, while larger translations (six to eight millimeters) indicate more pronounced instability but are less often cited as the standard cut-off in tests.

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