Final answer:
The number one cause of spinal stenosis, which can result in postural lower extremity pain with walking and tingling, is typically age-related degenerative changes in the spine.
Step-by-step explanation:
The number one cause of spinal stenosis, which can result in postural lower extremity pain with walking and tingling, is typically age-related degenerative changes in the spine. As we age, the intervertebral discs in the spine can degenerate and the ligaments can become thickened and calcified. These changes can lead to the narrowing of the spinal canal, which can compress the spinal cord or nerves and result in symptoms.
For example, if the narrowing occurs in the lumbar (lower) spine, it can compress the spinal nerves that contribute to the sciatic nerve, causing pain in the lower back, buttocks, and legs. This condition is known as lumbar spinal stenosis and can result in symptoms such as postural lower extremity pain with walking and tingling.