@ajames5 Typically cages are inserted when a disc is removed and that is a fusion when it all heals and bone grows into the cage. The abbreviation is ACDF for Anterior Cervical Discectomy and Fusion. The surgical scar tissue does periodically tighten up, and I have to work on mine. I also use a red (softer) "Davinci tool" which I can hold in my hands and press with a sideways shearing motion on a tight spot and hold it or put it up against a wall and push into it. That is how myofascial release works, and you just wait for it to untangle itself. It's kind of like pressing in to knead bread dough except you push and hold it against the pressure. You can lay on small firm balls where it is tender to use your body weight to stretch the fascia. It may help to use a heat wrap before you try to stretching to help it relax and soaking in epsom salts in a bath may help because magnesium helps muscles relax and you'll absorb it through your skin. You can also use webbing straps and foam rollers to help stretch or even your hands if you can get them in position to press in and have a sideways shearing motion. I'm guessing from your response that perhaps your surgery wasn't recent. It wouldn't matter what doctor refers you to physical therapy as long as you find a really good therapist. In the MFR discussion, there are a few videos that you may want to watch that explain how it works.

Good luck in your quest.
Jennifer