Which views provide the best visualization of lumbar pedicles and pars interarticularis?

Which views provide the best visualization of lumbar pedicles and pars interarticularis?

• A. Lumbar AP views visualize pedicles best.
• B. Lateral views best visualize pars interarticularis.
• C. AP oblique views for canal visualization.
• D. Lumbar oblique views for pars; lateral views for pedicles and canal.

Answer: (D)

The key idea is that different spine views reveal different structures best. The pars interarticularis lies between the facet joints and hides in frontal views, so rotating the lumbar spine about 45 degrees in an oblique view brings the pars into profile and makes any defects easy to see. That’s why lumbar oblique views are the go-to for visualizing the pars interarticularis. The pedicles are seen best in a lateral projection, where you get a true side view of their width and cortex without the overlap that occurs in AP or oblique views. The spinal canal also shows most clearly on a lateral view because its sagittal dimensions can be assessed without superimposed structures. So using lumbar oblique views to evaluate the pars and lateral views to evaluate the pedicles and canal provides the most effective visualization.

The key idea is that different spine views reveal different structures best. The pars interarticularis lies between the facet joints and hides in frontal views, so rotating the lumbar spine about 45 degrees in an oblique view brings the pars into profile and makes any defects easy to see. That’s why lumbar oblique views are the go-to for visualizing the pars interarticularis. The pedicles are seen best in a lateral projection, where you get a true side view of their width and cortex without the overlap that occurs in AP or oblique views. The spinal canal also shows most clearly on a lateral view because its sagittal dimensions can be assessed without superimposed structures. So using lumbar oblique views to evaluate the pars and lateral views to evaluate the pedicles and canal provides the most effective visualization.