What best describes the mechanism by which a tethered spinal cord leads to symptoms?

• A. Excessive stretch during growth causing ischemia and metabolic changes
• B. Increased blood flow to neural tissue
• C. Decreased CSF pressure
• D. Rapid nerve regeneration

Answer: (A)

The key idea is that a tethered spinal cord becomes stretched as a child grows, which places traction on the cord and reduces its blood supply. That decreased perfusion leads to ischemia and metabolic disturbances in neural tissue, causing progressive neurological symptoms such as pain, weakness, sensory changes, gait problems, and bladder or bowel dysfunction. This mechanism explains why symptoms worsen with growth and movement, reflecting ongoing traction rather than a change in blood flow that would be beneficial, a shift in CSF pressure as the primary driver, or any idea of rapid nerve regeneration. So, excessive stretch during growth causing ischemia and metabolic changes best describes how a tethered cord leads to symptoms.