Where is the top of the iliac crest generally located in relation to lumbar vertebrae?

The top of the iliac crest is typically located at the level of the L4-5 disc space. This anatomical landmark is significant in various medical procedures, including lumbar punctures and epidural injections, as it aids healthcare professionals in accurately identifying the appropriate site for performing these interventions.

In most individuals, the iliac crests provide a reliable reference point for the lower lumbar vertebrae, specifically aligning with the L4 vertebra and the corresponding disc space between L4 and L5. The relationship between the iliac crest and the lumbar spine is consistent enough that variations due to individual anatomy are usually negligible in clinical practice.

Understanding this relationship is vital for both diagnostic imaging and therapeutic procedures involving the lumbar spine, as improper identification of spinal levels can lead to complications during interventions.