Which step ensures a zero-degree starting point is established if possible?

• A. Position the patient correctly and expose the extremity/drape
• B. Perform PROM to end-range with stabilization
• C. Return the extremity to resting position
• D. Establish a zero-degree starting point (if able)

Answer: (D)

Establishing a zero-degree starting point provides the reference angle for all subsequent movement, ensuring ROM measurements are consistent and comparable across attempts and examiners. By returning the limb to its anatomical neutral and aligning the measuring tool to zero, you create a reliable baseline from which to assess end-range motion. This step is performed if possible because some joints or conditions may prevent true neutral, but attempting it anyway maximizes accuracy. Once the zero point is set, you can proceed with PROM to end-range with stabilization, using that baseline to interpret how far the joint moves. Positioning and exposure are important for access, and returning to resting can aid comfort, but they do not establish the measurement baseline.