Rib Position Tests (inspiration and expiration) are used to determine which of the following?

• A. To evaluate diaphragmatic motion
• B. To measure chest expansion
• C. To determine if a rib is out of joint
• D. To assess rib fracture

Answer: (C)

Rib Position Tests are about detecting a rib that is not moving normally at its joint. When you inhale and exhale, a normal rib glides and returns in sync with the others. If a rib is out of joint (subluxed), its movement is abnormal or “stuck,” and you can feel or observe that discrepancy during inspiration and expiration. This test is specifically used to identify rib misalignment rather than assess overall chest size or injuries like fractures.

Diaphragmatic motion is about how the diaphragm moves and is usually evaluated with different methods or imaging. Chest expansion measures how much the chest expands overall, not the motion of a single rib joint. A rib fracture would present with localized pain, tenderness, and possibly crepitus rather than a detectable abnormal rib motion pattern during breathing.