Palpation Palmer Practice Exam

What is the PP for Thompson sacral check?

Prone Supine Seated Side-lying

Correct Answer:

Prone

Explanation:

The key idea is choosing the position that gives the best access to the sacrum’s posterior landmarks. For the Thompson sacral check, you need to palpate the sacral base and the bilateral sulci from behind to assess symmetry and motion relative to the ilia. Being prone provides direct posterior access, allowing accurate feeling of the sacral landmarks and stable palpation of the pelvis as you compare sides. In other positions, the sacral surface is harder to reach, landmarks are less accessible, and muscle tension or stability can distort what you’re feeling. So, the prone position is the best choice for this check.

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