Which radiographic views are used to assess lumbar instability by measuring translation and angular motion?

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Multiple Choice

Which radiographic views are used to assess lumbar instability by measuring translation and angular motion?

Assessing lumbar instability requires dynamic views that reveal how a motion segment moves. Flexion and extension radiographs capture the spine in two different positions, letting you quantify both translation (how far one vertebra slides on the next) and angular motion (how the angle between adjacent vertebrae changes). Static views—like AP/PA, a single lateral, or oblique images—show anatomy but not how the segments move, so they can’t reliably measure instability. By comparing the flexed and extended positions, you can detect abnormal motion, such as excessive translation or angular change, indicating instability.

Assessing lumbar instability requires dynamic views that reveal how a motion segment moves. Flexion and extension radiographs capture the spine in two different positions, letting you quantify both translation (how far one vertebra slides on the next) and angular motion (how the angle between adjacent vertebrae changes). Static views—like AP/PA, a single lateral, or oblique images—show anatomy but not how the segments move, so they can’t reliably measure instability. By comparing the flexed and extended positions, you can detect abnormal motion, such as excessive translation or angular change, indicating instability.

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