CPM

What is a continuous passive motion machine?

A continuous passive motion (CPM) machine is a device that slowly and gently moves your joint while you are in bed. You may need to use a CPM machine for any of the following:

  • After surgery such as a total knee replacements or ACL repairs
  • After excision of scar tissue from a joint with manipulation for stiffness
  • For conditions such as osteoarthritis or after a fracture in your arm or leg

How can a CPM machine help me?

Your healthcare provider may tell you use a CPM machine with other treatments such as physical therapy. A CPM machine may help you recover from surgery or injury in the following ways:

  • The range of motion (ROM) of your arm or leg will increase. The CPM machine will flex (bend) your joint for you. Your healthcare provider may program the CPM machine to increase the amount that your joint is flexed over time. ROM may prevent scar tissue from forming. This may also prevent pain and stiffness in your knee.
  • Your muscles may get stronger more quickly. The CPM machine will gently exercise your arm and leg muscles to prevent them from getting weak. Your tendons and ligaments, the tissue that connects your muscles and bones, may also get stronger by using a CPM.
  • You may have less pain. A CPM machine will elevate your leg or arm and decrease swelling. You may have less pain if your swelling is decreased.
  • You may have increased blood flow in your arm or leg. Increased blood flow to your tissues will help you heal faster.

How do I use a CPM machine safely?

Our team at Motion Technologies will show you how to set up your CPM machine. We will also show you how to change the amount of flexion, speed, and time. You may need to use your CPM machine for up to 2 hours at a time, 3 to 4 times per day. If you use a machine for your shoulder, you may use the machine for only 20 to 30 minutes at a time. The following are safety precautions:

  • Place your CPM machine against your headboard or a heavy object. This will prevent it from moving while you use it.
  • Plug in the CPM machine. Move the cord under the bed or secure it to the ground to prevent falls.
  • You may need to remove a knee immobilizer before using a CPM machine.
  • If using a CPM machine for your knee, place your leg so that the middle of your knee rests where the CPM machine bends, and the bottom of your foot is against the foot pad.
  • If using a CPM machine for your shoulder, place your elbow so that it rests where the CPM bends. Place your hand around the hand grip.
  • Attach your leg to the machine by wrapping the machine’s straps around your thigh, shin, and foot.
  • Attach your arm to the machine by wrapping the machine’s strap around your lower arm.
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