CAMRT Radiography Practice Exam

Which specific lumbar spine position is most diagnostic for demonstrating spondylolisthesis at the L5-S1 level?

1. Lateral L5-S1 position

2. AP lumbar spine position

3. Oblique lumbar spine position

4. Flexed lateral position

The correct answer is: Lateral L5-S1 position

The lateral L5-S1 position is particularly useful for demonstrating spondylolisthesis at the L5-S1 level due to its ability to provide a clear profile view of the lumbar vertebrae. This position allows for the visualization of the lateral aspect of L5 and the sacral base, which is critical in assessing lateral displacement that characterizes spondylolisthesis. The anatomy is best demonstrated in this specific view, as it helps in identifying any slippage of the vertebrae, which is essential for diagnosing the condition accurately. In contrast, the AP lumbar spine position is more suited for viewing the vertebrae in an anterior-posterior alignment and may not provide the necessary detail regarding the position of the L5 vertebra concerning the sacrum. The oblique lumbar spine position emphasizes the intervertebral foramina and zygapophyseal joints but may not be as effective for viewing the specific alignment and displacement of the lumbar vertebrae themselves in cases of spondylolisthesis. The flexed lateral position, while useful for certain conditions, does not offer the same level of diagnostic clarity for spondylolisthesis at this level as the dedicated lateral L5-S1 position. Thus,