What Is Degenerative Disk Disease?
Your spine is made up of 33 vertebrae that are stacked on top of one another. Between each of these vertebrae is a rubbery piece of cartilage called an "intervertebral disk." (See images: Degenerative Disk Disease - Cervical | Lumbar.) Imagine the disk as a tire, with gelatin filling the hole in the tire. The tire is called the "annulus," and the gelatin is called the "nucleus." When we're young—under 30 years of age—the disk is made mostly of gelatin. As we age, and sometimes with injury, we start to lose some of that gelatin and the volume of the disk decreases, resulting in less space between the vertebrae. The disk becomes flatter and less flexible, leaving less space between each set of vertebrae. Sometimes bone spurs form in response to this degeneration of the disk, which could make the spine stiff. Often, this flattening and additional stiffness to the spine is not at all painful. However, in some cases, when the rough surfaces of the vertebral joints rub together, pain and inflammation may result. The nerve root, the point where a spinal nerve exits the spine and extends to other parts of the body, may become irritated or compressed.
Disk degeneration may occur throughout several regions of the spine, or it may be limited to 1 disk. Degeneration does not always lead to pain. For some people, however, it can cause a great deal of pain and disability.
You are more likely to develop DDD if you:
- Are obese
- Do heavy physical work
- Don't get very much exercise
How Does it Feel?
With DDD, you may experience mild to intense neck and back pain—or no pain at all:
- A degenerative disk in the neck may cause pain in the arm, shoulder, or neck.
- A degenerative disk in the low back may cause pain in the back, buttocks, or legs.
The pain is often made worse by sitting, bending, and reaching. It may be worse first thing in the morning and after staying in any one position for a long time.
In severe cases, when DDD results in pressure on the nerve root, it can lead to numbness, tingling, and even weakness in the arms or legs.
How Is It Diagnosed?
Your physical therapist will conduct a thorough evaluation that includes a review of your medical history, and will use screening tools to determine the likelihood of DDD. For example, your physical therapist may:
- Ask you very specific questions about the location and behavior of your pain, weakness, and other symptoms
- Ask you to fill out a body diagram to indicate specific areas of pain, numbness, and tingling
- Perform tests of muscle strength and sensation to determine the presence of pressure on the nerve
- Examine your posture and observe how you walk and perform other activities
- Measure the range of motion of your spine and your arms and legs
- Use manual (hands-on) therapy to evaluate the mobility of the joints and muscles in your spine
- Test the strength of important muscle groups
If you have muscle weakness, loss of sensation, or severe pain, diagnostic tests, such as an X-ray or MRI, may be needed. However, X-ray evidence of wearing in the joints of the spine is found in people with back pain as well as in many who have never experienced back pain. Studies have shown that disc degeneration is present in 40% of individuals under the age of 30 and present in over 90% of those aged 50 to 55 years. Do not panic if your X-ray or MRI shows “problems” with your discs; these are normal changes that happen from the age of 20 years and onward. Physical therapists work closely with physicians and other health care providers to make certain that an accurate diagnosis is made and the appropriate treatment is provided.
Research shows that in all but the most extreme cases (usually involving muscle weakness or high levels of pain), conservative care, such as physical therapy, has better results than surgery. Research also shows that results from conservative care and surgery are the same after 18 months post operatively.
After the evaluation, if your physical therapist suspects you have DDD and there are no major medical problems, treatment can begin right away.
How Can a Physical Therapist Help?
Your physical therapist's overall purpose is to help you continue to participate in your daily activities and life roles. Your physical therapist will design a treatment program based on both the findings of the evaluation and your personal goals. The treatment program may include:
Stretching and flexibility exercises. Your physical therapist will teach you specific exercises to improve movement in the joints and muscles of your spine, arms, and legs. Improving motion in a joint is often the key to pain relief.
Strengthening exercises. Strong trunk muscles provide support for your spinal joints, and strong arm and leg muscles help take some of the workload off your spinal joints.
Aerobic exercise. Regular aerobic exercise, such as walking, swimming, or taking a low-impact aerobics class, has been shown to help relieve pain, promote a healthy body weight, and improve overall strength and mobility—all important factors in managing DDD.
This might sound like a lot of exercise, but don't worry, research shows that the more exercise you can handle, the quicker you'll get rid of your pain and other symptoms.
Your treatment program may also include:
Manual therapy. Your physical therapist may apply manual (hands-on) therapy, such as massage, to improve movement in stiff joints and tight muscles that may be contributing to your symptoms.
Posture and body mechanics education. Your physical therapist may show you how to make small changes in how you sit, stand, bend, and lift—even in how you sleep—to help relieve your pain and help you manage your condition on your own.
Note: Studies show that recurrence of neck and low back pain is common when a condition such as DDD is not properly treated. Regular performance of the exercises your physical therapist chooses for you is extremely important to make sure your pain does not return.
Can this Injury or Condition be Prevented?
DDD is a natural result of aging. However, you can make choices that lessen its impact on your life and slow its progression. Your local physical therapy clinic can offer you advice on staying strong and fit. Some physical therapy clinics conduct regular educational seminars to help people in the community learn to take care of their backs and necks. Your physical therapist can help you develop a fitness program that takes into account your DDD. There are some exercises that are better than others for people with DDD, and your physical therapist will choose the right ones for you. For instance:
- Exercising in water can often be a great way to stay physically active when other forms of exercise are painful.
- Exercises involving repetitive twisting and bending need to be performed with some caution. If you start to notice some aching or pain after exercising, consult with a health care professional, such as a physical therapist, who can improve the way you move—and help reduce or eliminate your back or neck symptoms.
- Weight-training exercises, though important, need to be done with proper form to avoid stress to the back and neck. Your physical therapist will work with you to ensure your weight training is safe and effective.
What Kind of Physical Therapist Do I Need?
All physical therapists are prepared through education and experience to treat people who have DDD. You may want to consider:
- A physical therapist who is experienced in treating people with pain, orthopedic, or musculoskeletal, diagnoses.
- A physical therapist who is a board-certified clinical specialist or who completed a residency or fellowship in orthopaedic physical therapy. This therapist has advanced knowledge, experience, and skills that may apply to your condition.
- You can find physical therapists who have these and other credentials by using Find a PT, the online tool built by the American Physical Therapy Association to help you search for physical therapists with specific clinical expertise in your geographic area.
General tips when you're looking for a physical therapist:
- Get recommendations from family and friends or from other health care providers.
- When you contact a physical therapy clinic for an appointment, ask about the physical therapist's experience in helping people with DDD.
- During your first visit with the physical therapist, be prepared to describe your symptoms in as much detail as possible, and say what makes your symptoms worse.
The American Physical Therapy Association (APTA) believes that consumers should have access to information that could help them make health care decisions and also prepare them for their visit with their health care provider.
The following articles provide some of the best scientific evidence related to physical therapy treatment of degenerative disk disease. The articles report recent research and give an overview of the standards of practice for treatment of DDD both in the United States and internationally. The article titles are linked either to a PubMed abstract of the article or to free full text, so that you can read it or print out a copy to bring with you to your health care provider.
Macedo LG, Maher CG, Latimer J, McAuley JH. Motor control exercise for persistent, nonspecific low back pain: a systematic review. Phys Ther. 2009;89:9–25. Free Article.
Beattie PF. Current understanding of lumbar intervertebral disc degeneration: a review with emphasis upon etiology, pathophysiology, and lumbar magnetic resonance imaging findings. J Orthop Sports Phys Ther. 2008;38:329–340. Free Article.
Chou R, Qaseem A, Snow V, et al. Diagnosis and treatment of low back pain: a joint clinical practice guideline from the American College of Physicians and the American Pain Society [published correction appears in: Diagnosis and treatment of low back pain. Ann Intern Med. 2008]. Ann Intern Med. 2007;147:478–491. Free Article.
Roh JS, Teng AL, Yoo JU, et al. Degenerative disorders of the lumbar and cervical spine. Orthop Clin North Am. 2005:36:255–262. Article Summary on PubMed.
Authored by Chris Bise, PT, DPT. Reviewed by the MoveForwardPT.com editorial board.