The nurse examines a client who had a total knee replacement and has been placed in a continuous ...

The nurse examines a client who had a total knee replacement and has been placed in a continuous passive motion machine. The client asks, What is the purpose of that machine? The nurse explains the purpose by saying:
 
  1. The machine is used to prevent scarring of the incision site and keep the knee elevated.
  2. The machine prevents rusting of the artificial joint, which could occur because of the fluids in your body coming in contact with it.
  3. The machine helps to decrease swelling and maintain normal function until you can begin exercising your knee independently.
  4. The machine helps to provide exercise so you don't gain weight while your activity level is diminished.