A nurse is caring for a patient who is using a CPM device following a right knee replacement. Which of the following actions should the nurse take when applying the CPM device
a) Set the CPM machine at a fixed angle and do not adjust it during use.
b) Ensure the knee is fully extended and locked while using the CPM device.
c) Start with a slow range of motion and gradually increase as tolerated.
d) Place a pillow under the patient's knee to maintain a flexed position.