What are the restrictions for a PLI?

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Multiple Choice

What are the restrictions for a PLI?

Understanding how a PLI restricts movement helps you see why this pattern fits. A PLI lesion tends to limit motion in directions that load the posterior structures of the spine. Flexion tightens or tensions those posterior ligaments and facets, creating a barrier to bending forward. In the lumbar region, lateral bending to one side is coupled with rotation toward the opposite side, so a lesion that restricts the coupled motions will show restricted movement in both left rotation and right lateral bending. Put together, flexion with left rotation and right lateral bend restriction match the typical PLI pattern. The other options either propose extension or pair directions that don’t align with the usual coupling, so they don’t fit the expected PLI restriction pattern.

Understanding how a PLI restricts movement helps you see why this pattern fits. A PLI lesion tends to limit motion in directions that load the posterior structures of the spine. Flexion tightens or tensions those posterior ligaments and facets, creating a barrier to bending forward. In the lumbar region, lateral bending to one side is coupled with rotation toward the opposite side, so a lesion that restricts the coupled motions will show restricted movement in both left rotation and right lateral bending. Put together, flexion with left rotation and right lateral bend restriction match the typical PLI pattern. The other options either propose extension or pair directions that don’t align with the usual coupling, so they don’t fit the expected PLI restriction pattern.

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