A CPM machine is a device fitted to the leg, usually after surgery, to keep the limb slowly bending and straightening.

This is to prevent the formation of adhesions.

Synonyms: 
Continuous passive motion machine
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A discussion of those triggers that may lead to a stiff knee after knee replacement.

Image of KLC Flex-Mate K500 Knee CPM

Invaluable but a pricey purchase. Check if you are able to rent one locally.

Total knee replacement represents a considerable insult to the system when you consider -

  • the patient requires an anaesthetic
  • a skin
...

CPM - continuous passive motion

Passive gentle machine-assisted exercise to maintain range of motion.

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