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The Most Common Causes
of Neck Pain

The disc is made up of connective tissue, which wears normally as we age. However, many of the problems that cause neck pain are from abnormal wear and tear. This process is called degeneration of the intervertebral disc. Degeneration often results from small injuries that may not cause pain at the time the injuries actually occur. Over time, these injuries add up and the abnormal wear and tear can weaken the connective tissue that makes up the disc. Once the connective tissue is weak, sudden stress, such as a whiplash type movement, may injure the disc more easily. The entire process of disc degeneration is sometimes referred to as spondylolysis. You may hear your doctor refer to your neck problem as spondylolysis of the cervical spine.

To really understand neck pain, you need an understanding of the wear and tear process, called disc degeneration. This will also help you later understand what can happen to the neck when a sudden injury can cause immediate pain and dysfunction. The next section will explain both the process of degeneration and the most common causes of pain in the neck.

Degenerative Disc Disease
To help you understand disc degeneration, compare a spinal segment to two vanilla wafers (the "vertebrae") and a marshmallow (the "disc"). Imagine a fresh marshmallow between the two wafers. When you press the wafers close together, the marshmallow gives or "squishes out". Suppose you leave the marshmallow out for a week and it starts to dry out. When you press it between the wafers, it is not quite as spongy. If you press hard enough, the outside of the marshmallow may even tear or split. Suppose you left the marshmallow out for a month. It would probably be so dried out it would be hard and very thin and would not have any "shock absorbing" ability.

As we age, the disc loses some of its water content and, as a result, some of its shock absorbing ability. Like the marshmallow, the first changes that occur in the disc are tears in the outer ring of the disc, called the annulus. Tears in the annulus may occur without symptoms. Therefore, you may not notice when they occur or what caused them. These tears heal by forming scar tissue. Scar tissue is weaker than normal tissue. Repeated injuries and tears cause more wear and tear to the disc. As the disc wears, it loses more of its water content. It becomes less and less "spongy", eventually no longer able to act as a shock absorber.

As the disc continues to wear, it begins to collapse. The space between each vertebra becomes smaller. The collapse also affects the way that the facet joints in the back of the spine "line up". Like any other joint in the body, the change in the way the bones fit together causes abnormal pressure on the articular cartilage. Articular cartilage is the smooth shiny material that covers the end of the bones in any joint. Over time, this abnormal pressure causes wear and tear arthritis (osteoarthritis) of the facet joints.

Bone spurs may form around the disc and facet joints. It is thought that too much motion in a spinal segment causes the bone spurs to form. Eventually, bone spurs can form around the nerves of the spine, causing a condition called spinal stenosis.

Spinal Conditions
Degeneration of the disc and spinal segment can result in several different spinal conditions that cause problems. These include: mechanical neck pain, cervical radiculopathy, and spinal stenosis. Sometimes we may injure our neck with a relatively minor injury. These minor injuries may cause pain for a few days and then go away. This is commonly referred to as a neck, or muscle strain. Actually, we may never fully understand what has been injured in one of these episodes. In the next section, we will try to explain each condition and how they differ.

Muscle Strain
A "muscle strain" of the neck is a common diagnosis given when a patient presents a stiff neck. In some cases, this may represent a true "muscle strain", or "pulled muscle" involving the muscles around the spine of the neck. However, muscle spasm is a common symptom that can result when other areas of the neck are injured. Problems that are commonly referred to as a muscle strain may also involve injury of other soft tissues of the neck including: the disc, the ligaments around the spinal segment, and the muscles. Injury to any, or all, of these structures may cause similar symptoms.

Mechanical Neck Pain

A chronic neck ache where the pain stays mainly in the neck may be the result of degenerative disc disease and arthritis of the facet joints of the cervical spine. Doctors sometimes refer to this type of pain as mechanical pain. This term is used because it gets worse when we use our neck more and seems to be coming from the parts of the cervical spine - the mechanical parts that allow us to move our head around and up and down.

X-ray Cervical disc Degeneration
(Click to enlarge image)
This type of pain does not come from pinched, or irritated, nerves. The pain seems to come from the inflamed facet joints and from the degenerated disc. As the disc and facet joints become more inflamed when we use our neck to move our head, the muscles around the cervical spine begin to spasm. You can think of a muscle spasm similar to a muscle cramp. Muscles that are cramping eventually cause pain. The spasm occurs as the body's response to try to stop the movement in the cervical spine.
 
Cervical Radiculopathy (Pinched Nerve)
When a nerve root leaves the spinal cord and the cervical spine, it travels down into the arm. Along the way, each nerve supplies sensation (feeling) to a part of the skin of the shoulder and arm and supplies electrical signals to certain muscles to move part of the arm or hand. When a nerve is irritated or pinched - by either a bone spur or part of the intervertebral disc - it causes the nerve not work properly. This shows up as: weakness in the muscles the nerve goes to, numbness in the skin where the nerve goes, or pain in the area where the nerve travels. This condition is called cervical radiculopathy. Let's look at the different causes of cervical radiculopathy.

Pinched Nerve from a Herniated Disc

Bending the neck forward and backward, and twisting left and right, places many kinds of pressure on the vertebrae and disc. The disc responds to the pressure from the vertebrae by acting as a shock absorber. Bending the neck forward compresses the disc between the vertebrae. This increased pressure on the disc may cause the disc to bulge toward the spinal canal and the nerve roots. Remember the vanilla wafers and marshmallow; pressing the wafers together on one side would cause the marshmallow to bulge out on the opposite side.
 

Injury to the disc may occur when neck motion puts too much pressure on the disc. One of the most painful injuries that can occur is a herniated disc. In this injury, the tear in the annulus is so bad that part of the nucleus pulposus squeezes out of the center of the disc. The annulus can tear or rupture anywhere around the disc. If it tears on the side next to the spinal canal, then when the nucleus pulposus squeezes out, it can press against the spinal nerves. Pressure on the nerve root from a herniated disc can cause pain, numbness, and weakness along the nerve. There is also evidence that the chemicals released from the ruptured disc may irritate the nerve root, leading to some of the symptoms of a herniated disc - especially pain.

Herniated discs are more common in early, middle-aged adults. This condition may occur when too much force is exerted on an otherwise healthy intervertebral disc. An example would be a car accident where your head hit the windshield. The force on the neck is simply too much for even a healthy disc to absorb and injury is the result. A herniated disc may also occur in a disc that has been weakened by the degenerative process. Once weakened, less force is needed to cause the disc to tear or rupture. However, not everyone with a ruptured disc has degenerative disc disease. Likewise, not everyone with degenerative disc disease will suffer a ruptured disc.

Pinched Nerve from Degeneration and Bone Spurs
In middle-aged and older people, the degenerative disc disease can cause bone spurs to form around the nerve roots. This usually occurs inside the foramen - the opening in the cervical spine where the nerve root leaves the spine to travel into the arm. If these bone spurs get large enough, they may begin to rub on the nerve root and irritate it. This causes the same symptoms as a herniated disc. The irritation causes: pain to run down the arm, numbness to occur in the areas to which the nerve provides sensation, and weakness in the muscles that the nerve supplies.

Spinal Stenosis (Cervical Myelopathy)
Perhaps the most serious of the problems caused by degeneration of the spinal segment in the cervical spine is the condition of spinal stenosis. In the late stages of spinal degeneration, bone spurs from the degenerative process can cause a condition known as spinal stenosis. As the bone spurs form, the size of the spinal canal becomes smaller. The bone spurs begin to press on the spinal cord or the nerve roots. Pressure on the nerves in the spinal cord can cause numbness, tingling, or pain in the arms, hands, and legs. This condition is sometimes called cervical myelopathy and is different from the simpler problem where only one nerve root is being pinched by a herniated disc or a bone spur.

When there is narrowing of the spinal canal (the bony tube where the spinal cord runs), the whole spinal cord may be affected. This is different than when the bone spurs only narrow one of the foramen (the openings where the nerve roots exit). The symptoms are much different. A pinched nerve from either a herniated disc or a bone spur rarely affects the legs. Cervical myelopathy can affect both the arms and the legs.


Symptoms

Symptoms are how the cause of your pain affects you. Common symptoms include:

• Pain in your neck
• Headaches
• Pain in your shoulder, arm, or hand
• Reduced range of motion in your neck
• Numbness, weakness, and slower reflexes in your arms, hands,legs, or feet
• Problems walking including a "spastic gait"
• Muscle weakness in your legs

 
 
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Herniated Disks -
One Cause of Neck Pain
- also called slipped disks, bulging disks, ruptured disks
- Wear and tear weakens or flattens the fluid-filled pads, "discs", so they push against nerves, causing distress
- Traction works to relieve compression of the disk, at the same time promoting more normal curvature of the spine. Symptoms are eased. The long-term aim is to provide enough relief to restore normal disk functioning.
   
 
MORE ABOUT
NECK TRACTION
Neck Pain (Overview)
The Most Common Causes of Neck Pain
Neck Pain Diagnosis
Neck Pain Treatment
Surgical Complications
 

 

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