Continuous Passive Motion (CPM) Machine

________________________________________________________________________

KEY POINTS

• A continuous passive motion (CPM) machine may be used to move your joint after an injury or joint replacement surgery. It is most commonly used after knee replacement surgery, but it may also be used to help with ankle, elbow, or shoulder joints.
• A CPM machine is used to help your joints move more easily, and to help decrease scar tissue and pain after surgery.

________________________________________________________________________

What is a CPM machine?

A continuous passive motion (CPM) machine may be used to move your joint after an injury or joint replacement surgery. It is most commonly used after knee replacement surgery, but it may also be used to help with ankle, elbow, or shoulder joints.

When is it used?

A CPM machine is used to:

• Increase range of motion and the ability to bend your joint
• Decrease pain in the days and weeks after surgery
• Help cartilage heal. Cartilage is tissue that lines the surfaces of joints.
• Decrease scar tissue and help prevent joint stiffness or frozen shoulder

How does it work?

For the knee, your leg will be strapped to a narrow platform, with your foot resting against the foot plate. The amount of bending and stretching, called flexion and extension, is prescribed by your healthcare provider. The CPM machine will move your joint gently and slowly. Usually you will use the CPM machine for 12 to 14 hours per day, with breaks every 2 hours for 3 weeks after surgery.

For other joints, you will also strap in and exercise for the amount of time advised by your healthcare provider.

How do I get a CPM machine?

You will likely start using a CPM machine after knee replacement surgery, while you are in the hospital. Some people are placed in a CPM right after surgery.

If you go into a rehab center after leaving the hospital, you will use their CPM machine. Your healthcare provider may prescribe a rental CPM machine that you can use at home. This is often covered by health insurance.