Back Pain: Intervertebral Disc Conditions

The term ‘disc’ is short for the ‘intervertebral discs’, the spongy cushions that separate the block-like bones (vertebrae) of the spine. These discs have a number of important functions including shock absorption, keeping the vertebral column stable and giving the vertebrae ‘pivot points’ to allow movement. 

A disc is made of two parts: the elastic outer shell (annulus fibrosis) and the jelly-like contents (nucleus pulposis). It can handle quite a lot of pressure without damage, but certain types of pressure can damage the shell and push its contents out. 

Symptoms of disc problems

The symptoms of a damaged disc can vary according to its location and severity. Many people who show evidence on scanning of damaged discs have no symptoms. This means that, most commonly, there are no symptoms at all. However, general signs may include:

• Back pain
• Pain radiating down the legs
• Worsening pain associated with bending over or sitting down for a long time
• Worsening pain associated with activities like coughing or sneezing
• Numbness or pins-and-needles in an arm or leg.

Risk factors for disc problems

Some people are more susceptible to disc problems than others. Risk factors include:

• Obesity
• Poor muscle tone
• Lack of regular exercise
• Cigarette smoking
• Advancing age
• Poor posture
• Incorrect lifting techniques.

Often, however, there is no recognisable risk factor present.

Types of disc problems

Common disc-related problems include degenerative disc disease, ruptured (or ‘slipped’) disc and sciatica (nerve pain).

Degenerative disc disease

The discs of a young child are plump and moist, but the water content reduces with age until the discs are comparatively thin and hard. As a result of this, friction between the bones is thought to increase, resulting in growths called bone spurs around the discs.

In many cases, these age-related changes cause no problems, but some people experience a painful condition called degenerative disc disease. The most common symptom is back pain caused by holding the same position (either sitting or standing) for too long. It’s among the most common causes of chronic back pain in older people. 

Ruptured disc

The term ‘slipped disc’ suggests that a disc has moved out of position, but this is not accurate. The discs are held firmly in place by various structures (including ligaments, muscles and the vertebrae themselves).

Terms like ‘ruptured’, ‘herniated’ or ‘prolapsed’ describe the situation better, as the real problem is not that the entire disc ‘slips’, but rather that a crack in the tough outer shell of the disc allows the soft jelly-like contents to ooze out. When this material comes into contact with other structures, especially the spinal nerves that run nearby, this can cause pain and alter nerve function. 

The most common site for a ruptured disc is the lower back, and chronic lower backache can be a symptom. As we get older, the risk of rupturing a disc declines because the discs dry out and the contents are less able to ooze through any cracks.

Sciatica

Sciatica is nerve pain from the sciatic nerve that runs from the spine into the buttock and down the back of the leg. A common cause of sciatica is a ruptured disc. The spinal cord normally has room to slide up and down inside the spinal column whenever the body moves. However, a bulging disc can protrude into the spinal column and press against the spinal nerves, hampering its movement and causing pain. 

Diagnosis of disc problems

Diagnosis of disc problems involves:

• Taking a medical history (to determine risk factors and predisposing conditions)
• A physical examination.

Other investigations are carried out if surgery may be required.

Treatment for disc problems

The majority of disc problems will resolve regardless of treatment. Bed rest is occasionally best for initial management of severe sciatica, but most people can keep active with some restrictions according to the level of pain. Good pain control and allowing the person to move is often a good approach. 

Some common treatments include:

• Heat treatment
• Regular massage
• An exercise program designed to improve strength and flexibility
• Non-steroidal anti-inflammatory drugs (NSAIDs) or steroids
• Pain-relieving medication
• An injection of anti-inflammatory steroids into the region of the disc
• Uncommonly, in severe cases of ruptured disc, an operation may be needed to trim the protruding bulge (laminectomy)
• Also uncommonly, in severe cases of degenerative disc disease, an operation may be needed to remove the disc and fuse together the two vertebrae on either side.

Remember, most disc problems resolve without specific treatment. 

Self-help for disc problems

Given time and the right conditions, a ruptured disc can heal itself. Ongoing maintenance can reduce the risk of disc problems in the future. Be guided by your doctor or health professional, but general suggestions include:

• Try not to sit still for long periods of time.
• Avoid lifting heavy objects.
• Remember that movements such as bending and twisting (especially at the same time) can increase pressure on your damaged disc.
• Work on increasing your abdominal strength. Strong stomach muscles help to support the back. People who work hard on their abdominal muscles probably have much less recurrence of back pain over the long term, but only if they keep doing the exercises.
• Pay attention to posture while sitting, standing and walking.
• Flexibility exercises, performed regularly, can improve mobility and help reduce muscle tension and back pain.
• Include a gentle program of back-strengthening exercises.
• Yoga is recommended by some practitioners as an excellent form of strengthening and stretching for people with back problems.

Other causes of back pain

There are many other causes of back pain, so see your doctor if pain is strong. Important other reasons for back pain include:

• Muscular pain – probably even more common than disc rupture. It is usually localised to the back, without the pain spreading to the legs and very likely to fix itself without specific treatment
• Fracture – especially in elderly people, or those with osteoporosis
• Malignancy – some cancers can present with back pain. See your doctor if you have strong pain, night pain, have experienced weight loss or any other symptoms you are worried about.

Where to get help

• Your doctor
• Physiotherapist
• Osteopath

Things to remember

• Intervertebral discs are spongy cushions found between the vertebrae of the spine.
• Common problems include degenerative disc disease and ruptured (or ‘slipped’) disc.
• Risk factors for disc problems include obesity, advancing age, lack of exercise and incorrect lifting techniques.

This article originally appeared on www.betterhealth.vic.gov.au

Piriformis Syndrome

Piriformis syndrome is an uncommon neuromuscular disorder that is caused when the piriformis muscle compresses the sciatic nerve. The piriformis muscle is a flat, band-like muscle located in the buttocks near the top of the hip joint. This muscle is important in lower body movement because it stabilizes the hip joint and lifts and rotates the thigh away from the body. This enables us to walk, shift our weight from one foot to another, and maintain balance. It is also used in sports that involve lifting and rotating the thighs -- in short, in almost every motion of the hips and legs.

The sciatic nerve is a thick and long nerve in the body. It passes alongside or goes through the piriformis muscle, goes down the back of the leg, and eventually branches off into smaller nerves that end in the feet. Nerve compression can be caused by spasm of the piriformis muscle.

Piriformis Syndrome Signs and Symptoms

Piriformis syndrome usually starts with pain, tingling, or numbness in the buttocks. Pain can be severe and extend down the length of the sciatic nerve (called sciatica). The pain is due to the piriformis muscle compressing the sciatic nerve, such as while sitting on a car seat or running. Pain may also be triggered while climbing stairs, applying firm pressure directly over the piriformis muscle, or sitting for long periods of time. Most cases of sciatica, however, are not due to piriformis syndrome.

Piriformis Syndrome Diagnosis

There is no definitive test for piriformis syndrome. In many cases, there is a history of trauma to the area, repetitive, vigorous activity such as long-distance running, or prolonged sitting. Diagnosis of piriformis syndrome is made by the patient’s report of symptoms and by physical exam using a variety of movements to elicit pain to the piriformis muscle. In some cases, a contracted or tender piriformis muscle can be found on physical exam.

Because symptoms can be similar in other conditions, radiologic tests such as MRIs may be required to rule out other causes of sciatic nerve compression, such as a herniated disc.

Piriformis Syndrome Treatment

If pain is caused by sitting or certain activities, try to avoid positions that trigger pain. Rest, ice, and heat may help relieve symptoms. A doctor or physical therapist can suggest a program of exercises and stretches to help reduce sciatic nerve compression. Osteopathic manipulative treatment has been used to help relieve pain and increase range of motion. Some health care providers may recommend anti-inflammatory medications, muscle relaxants, or injections with a corticosteroid or anesthetic. Other therapies such as iontophoresis, which uses a mild electric current, and injection with botulinum toxin (botox) have been tried by some doctors. Using the paralytic properties of the botulinum toxin, botox injections is thought by some to relieve muscle tightness and sciatic nerve compression to minimize pain.

Surgery may be recommended as a last resort.

Prevention of Piriformis Syndrome

Since piriformis syndrome is usually caused by sports or movement that repeatedly stresses the piriformis muscle, such as running or lunging, prevention is often related to good form. Avoid running or exercising on hills or uneven surfaces. Warm up properly before activity and increase intensity gradually. Use good posture while running, walking, or exercising. If pain occurs, stop the activity and rest until pain subsides. See a health care provider as needed.

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