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CPM - Continuous Passive Motion

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Updated June 15, 2009

CPM machine knee surgery

A CPM is often used after knee replacement surgery.

Image © Medical Multimedia Group
Definition: CPM is an abbreviation for continuous passive motion. A CPM device is a machine that is used to move a joint without the patient having to exert any effort.

A CPM machine is most commonly used on the knee joint, although there are CPM machines made for other joints as well. The CPM has a motor that bends the knee back and forth to a set number of degrees. The amount of movement of the CPM can be adjusted.

CPM machines are often applied after knee surgery, such as a knee replacement procedure. The effectiveness of CPM is debatable, as they have not been shown to offer superior results after standard surgical procedures.

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