How do you assess for an unstable pelvis in a trauma patient?

To assess for an unstable pelvis in a trauma patient, applying gentle pressure to both iliac crests is the correct method. This assessment technique allows you to evaluate the stability of the pelvic ring. When gentle pressure is applied to the iliac crests, you can observe for any excessive movement or pain, which may indicate an unstable pelvic fracture.

The pelvis is a critical structure that can be subject to significant forces during trauma, leading to fractures that may compromise both structural integrity and hemodynamic stability. An unstable pelvis often results in significant bleeding and can compromise the patient's condition; thus, timely identification is essential.

In contrast, assessing for leg length discrepancies may indicate a fracture or dislocation but does not directly assess the stability of the pelvis itself. External rotation assessment could provide some insight into potential injury patterns, but it lacks the specificity for determining pelvic stability. A neurological examination of the lower extremities may be necessary in a complete trauma assessment, but it does not provide direct information regarding pelvic stability.