Will a lumbar sprain show on a xray?

No. Xrays are good for looking at the bones, but not good for looking at soft tissue injuries like sprains.
Npt usually. Lumbar spine xray is mainly to exclude bony abnormalties of spine. Muscle strain may be suggested by straightening of normal lordotic curvature of spine.

Related Questions

Can a lumbar sprain show on a xray?

Not usually. Soft tissue injuries do not usually show on plain radiograph but can be seen on ultrasound or mr exam. Secondary signs of sprain sometimes can be seen such as straigtening of the normal lordotic lumbar curvature. Read more...