 I think it was knee surgery number two when I had my ACL reconstructed. She was over helping and she would come over and she'd make me food and just check on me because I had to be in this machine. It was a CPM machine, continuous passive motion, and it would bend my knee and you'd increase it like five degrees every day to try and get it to 90 degrees before you went back for your first appointment. It was supposed to help reduce swelling and kind of speed the healing process.