What is the recommended diagnostic test for lumbar spinal stenosis?

Magnetic Resonance Imaging (MRI) is considered the recommended diagnostic test for lumbar spinal stenosis due to its ability to provide detailed images of the spinal cord, nerve roots, and surrounding soft tissues. This imaging technique allows for excellent visualization of anatomical structures and is particularly effective in identifying the compressive factors causing stenosis, such as herniated discs, ligamentous hypertrophy, and bony changes due to osteoarthritis.

In addition to its superior soft tissue contrast, MRI does not involve ionizing radiation, making it a safer choice for repeated imaging if necessary. It is also the preferred method for assessing the severity of stenosis and planning potential surgical interventions if needed. Other imaging modalities, such as X-rays and CT scans, may provide some information but do not offer the same level of detail regarding soft tissue structures. Ultrasound, while useful in certain contexts, is not typically employed for diagnosing spinal stenosis as it cannot adequately penetrate to visualize the necessary structures in the lumbar spine.