The anterior superior iliac spine (ASIS) is located at which vertebral level?

• A. S1
• B. S1-2
• C. S2-3
• D. L5

Answer: (B)

The anterior superior iliac spine (ASIS) is typically located at the level of the S1-S2 vertebral interspace. This anatomical landmark is significant as it serves as a reference point in various clinical and radiographic practices. Understanding the position of the ASIS is essential for several procedures, including pelvic positioning in radiography and assessing pelvic alignment.

The ASIS marks the anterolateral part of the iliac crest and is palpated easily on clinical examination, which further reinforces its role as a key landmark in physical assessments. The choice of the S1-S2 interspace highlights the level at which the ASIS aligns with the vertebral column, providing a practical basis for other measurements or references in anatomy and radiography.

Knowing the correct vertebral level of the ASIS is crucial for accurate imaging and intervention techniques, making the identification of this landmark a key component of radiographic practice.