What degree of rotation is typically used for the lumbar spine oblique projection to visualize zygapophyseal joints?

The correct degree of rotation for the lumbar spine oblique projection to effectively visualize the zygapophyseal joints is 45 degrees. This rotation allows the facet joints, located between the lumbar vertebrae, to be appropriately aligned and displayed on the radiograph. At this angle, the joints are opened up to their maximum visualization while minimizing the superimposition of overlying structures.

The objective of this positioning is to highlight the articulating surfaces of the lumbar vertebrae—critical for assessing conditions like arthritis, trauma, or other pathologies affecting the spinal joints. A 45-degree angle provides a balanced perspective that is widely accepted in radiography practice for capturing these specific joints reliably.