Are intrathecal and spinal the same?

Intrathecal and spinal are related but not the same. "Intrathecal" refers specifically to the administration of substances, such as medications, directly into the cerebrospinal fluid (CSF) within the spinal canal. This method targets the central nervous system more directly than systemic administration. "Spinal" can refer more broadly to anything associated with the spine, including spinal anesthesia or procedures involving the spinal cord.