Which landmark is used to assess pelvic alignment?

Which landmark is used to assess pelvic alignment?

• A. PSIS
• B. ASIS
• C. Iliac crest
• D. Coccyx

Answer: (A)

Assessing pelvic alignment relies on a reliable posterior reference point that reflects the pelvis’s orientation. The posterior superior iliac spine (PSIS) is that key landmark because it sits on the back of each iliac bone and is easy to palpate on both sides. When the pelvis tilts or rotates, the heights of the PSIS landmarks change in a way that you can compare side to side, making it a practical indicator of pelvic obliquity or rotation. Clinically, you can check PSIS height with the patient standing or lying prone and use it to gauge symmetry or to guide measurements of pelvic tilt. Other landmarks have their uses but aren’t as directly informative for overall pelvic alignment. The front-facing anterior superior iliac spine is more about anterior landmarks and pelvic tilt in the sagittal plane from the front, not the posterior reference used to assess symmetry. The iliac crest is broad and can feel level even when there’s tilt, making it less precise for detecting pelvic orientation. The coccyx is a midline posterior structure not typically used to judge the pelvis’s overall alignment.

Assessing pelvic alignment relies on a reliable posterior reference point that reflects the pelvis’s orientation. The posterior superior iliac spine (PSIS) is that key landmark because it sits on the back of each iliac bone and is easy to palpate on both sides. When the pelvis tilts or rotates, the heights of the PSIS landmarks change in a way that you can compare side to side, making it a practical indicator of pelvic obliquity or rotation. Clinically, you can check PSIS height with the patient standing or lying prone and use it to gauge symmetry or to guide measurements of pelvic tilt.

Other landmarks have their uses but aren’t as directly informative for overall pelvic alignment. The front-facing anterior superior iliac spine is more about anterior landmarks and pelvic tilt in the sagittal plane from the front, not the posterior reference used to assess symmetry. The iliac crest is broad and can feel level even when there’s tilt, making it less precise for detecting pelvic orientation. The coccyx is a midline posterior structure not typically used to judge the pelvis’s overall alignment.