A collar is actually a neck corset, that is, the type of corset hung on one’s neck. Sometimes it is only made of sponge to surround the neck and such is usually preferred for simple neck pain. Others also known as Philadelphia-type that are made from a harder elastic material that covers the back of the head, jaws and rest against the breastbone and thus do not allow the patient to return the head neither to the front nor to the back, left or right. Such hard collars are often preferred after complicated fusion surgery or after trauma, and they must always be used for the time recommended by the doctor.
It is important to remember that collars are harmful when used for more than three months and disturb the patient’s balance system during the time they are used. So, when you are wearing a collar you should avoid driving a vehicle and avoid further dangerous activities.