Total Joint Replacement Educational Series Part 14: What is a Continuous Passive Motion (CPM) Machine?
Posted Oct 10 2008 2:12pm
WHAT IS A CONTINUOUS PASSIVE MOTION (CPM) MACHINE?
A motion machine will be used post-operatively to
improve your range of motion more quickly and to make you feel more comfortable
following the knee replacement surgery. Even with the less invasive procedure, the healing of your incision can
cause scar tissue to form, which causes your tissues to be stiffer than normal
tissue. The use of the CPM machine
after your total knee replacement guides tissue growth, increases motion and
helps reduce stiffness. Your new
joint also likes to be moved so this motion machine can make you feel more
You can use the CPM machine based on your comfort
level, and it can be used as much or as little as you would like to use
it. We recommend that you use the
CPM machine at least two times daily for one to three hours at a time.
WHAT TO EXPECT...
The Day of Surgery
A CPM machine will be set up on your bed. The motion will be set to full
straightening with an initial bending of up to 90 degrees. Even when you are resting, the CPM
machine will work your knee!
Post-op Days One
Your bending will be increased based on how much
bending you achieve in physical therapy. In general, the bending will be increased by 10 degrees more than
achieved during your last exercise session. The goal will be for you to achieve 110 degrees or more of
bending. A portable CPM machine
also will follow you to home.