PROM is an abbreviation for 'Passive Range-of-Motion'.

range of motion
Normal range of motion of the knee.


Using a helper

The passive range of motion needs a helper to take the knee through the available range of motion without the patient trying to help, so that the muscles are relaxed.

passive range of motion

Range of Motion

Video explaining the terminology of flexion and extension of the knee.

Passive extension

Simple but important extension stretch.



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Patient Self-Assessed Passive Range of Motion of the Knee Cannot Replace Health Professional Measurements. Borgbjerg J, Madsen F and Odgaard A. J Knee Surg. 2017 Oct;30(8):829-834. doi: 10.1055/s-0037-1598174. Epub 2017 Mar 1.

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