Which of the following describes the fixations for a PRS?

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Multiple Choice

Which of the following describes the fixations for a PRS?

The main idea is that fixations describe which directions of motion are restricted at a spinal segment in three planes: sagittal (flexion/extension), transverse (rotation), and coronal (lateral bending). A PRS fixation means the segment is restricted in extension, and in rotation to the left, and in left lateral bending. So the correct description is extension, left rotation, and left lateral bend. This matches the pattern that defines PRS. The other options mix in flexion or reverse the direction in one or more planes, which would describe different fixations rather than PRS.

The main idea is that fixations describe which directions of motion are restricted at a spinal segment in three planes: sagittal (flexion/extension), transverse (rotation), and coronal (lateral bending). A PRS fixation means the segment is restricted in extension, and in rotation to the left, and in left lateral bending. So the correct description is extension, left rotation, and left lateral bend. This matches the pattern that defines PRS. The other options mix in flexion or reverse the direction in one or more planes, which would describe different fixations rather than PRS.

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