What is the purpose of a pain-free ROM criterion in rehab, and how is it assessed?

• A. To ensure the patient experiences pain during ROM to gauge limits; assessed with ROM measures.
• B. To ensure functional movement without pain; assess with goniometry and palpation/patient feedback during movement.
• C. To maximize ROM at any cost; assess with imaging.
• D. To compare ROM between days without tests.

Answer: (B)

Pain-free range of motion in rehab is about moving a joint through its available range without any pain, because pain during movement signals tissue irritation or insufficient healing and can lead to protective compensations that slow recovery. To assess it, the clinician asks the patient to perform the movement and uses tools like a goniometer to measure the angle reached, while also palpating around the joint and listening to the patient’s feedback about any pain during the motion. The goal is to confirm that movement is tolerated without pain before advancing loading or increasing range, ensuring safe, functional progression and protecting healing tissues. Some mild post-exercise soreness can occur, but pain during the motion itself should be avoided.