When and why do I wear a collar or brace?
If you had your spine fused, you will need to wear a hard cervical collar. Its purpose is to limit the movement of your neck and also take some pressure off of your neck so that the fusion will solidify.
If you were instructed to wear a back brace, it must be worn when you are sitting up, or out of bed. Its purpose is to limit the movement of your back and also take some pressure off of your back to promote fusion.