After having knee surgery, your doctor will likely prescribe a continuous passive motion (CPM) machine. This machine is used to gradually and safely move your joint while you are in recovery.
How long you use the CPM machine will depend on your individual situation and what your doctor prescribes. In general, most people use the machine for around 6 hours per day for the first week or two after surgery. After that, usage is gradually decreased until you are only using it for 30 minutes to 1 hour per day.
It is important to follow your doctor's instructions when using a CPM machine. Overusing the machine can lead to further injury, so make sure you understand how long you are supposed to use it each day. If you have any questions or concerns, be sure to talk to your doctor or surgeon.