Sciatica

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Content

The healthy lumbar spine
Introduction
Some common patterns of nerve root pain in the leg
Healing
Diagnosis
The main points of nerve root pain
Prognosis
Things that may help
Drug treatments
Physiotherapy and manual therapies
Injection therapy
Surgery
After the operation
Dos and don’ts
Usefull information sources for patients

Dear Patient

The following information was put together to help in the decision-making process. The graphs show the answers of the members of EuroSpine, the Spine Society of Europe, considered to be the European experts in the field of treatment of spine pathology. This information should help you to learn and understand what most of the experts in the field would do in each specific situation. The information reflects a “common sense” approach to treatment of the members of EuroSpine, yet does not replace a careful evaluation of your individual situation. Therefore, if you find a significant difference between the answers below and you doctor’s opinion, ask your doctor what made him/her reach this decision.

Each specific situation has to be evaluated on an individual basis. EuroSpine and its members cannot be held responsible for any misunderstandings (or misdiagnosis) based on the information provided here, which in no way attempts to replace a targeted evaluation.

Sciatica is the term used to describe pain down the leg caused by irritation or inflammation of one of the nerve roots that make up the sciatic nerve. Most commonly it is due to a disc prolapse within the lumbar spine. Another common cause is spinal stenosis or a narrowing of the canal through which the nerve travels. Spinal stenosis occurs more frequently with increasing age. There can sometimes be a combination of disc prolapse and narrowing of the space available for the nerve.

THE HEALTHY LUMBAR SPINE

General anatomy

The lumbar spine is between the chest and pelvis at the back of the abdomen. It is a very strong structure that carries the nerves to the legs, bowel and bladder. There are five bones – vertebrae – linked together by discs and ligaments that allow mobility of the trunk.

The spine is made up of many small bones called vertebrae. These are separated by discs that allow the spine to bend (see illustration below). This structure of vertebrae and discs is supported along its length by muscles and ligaments. The spinal cord threads through the centre of each vertebra, carrying nerves from the brain to the rest of the body.

The soft tissues of the lumbar spine simply refer to the parts that are not bone. At the back of the spine, powerful muscles as well as ligaments and tendons link the vertebrae. Discs are special, very strong joints at the front of the spine. There are smaller joints at the back of the spine called facet joints. All these joints allow a certain degree of movement.

INTRODUCTION

Nerve root pain comes from a nerve in the back. As nerves carry messages about sensations and control of muscles, disorders can cause pain, numbness, increased sensitivity or weakness of muscles. The pain is often felt in the area of the body supplied by that nerve. It is common for the leg nerves and arm nerves to be affected.

Lumbar nerve pain (often called sciatica) generally occurs below the knee. Back pain is usually felt between the lower ribs and the buttocks. In many cases, there is a combination of back and leg pain. In sciatica, the leg pain is worse than the back pain. While sciatica is usually caused by a disc prolapse (a slipped disc), there are other causes. Sometimes, nerve pain can be caused by conditions such as diabetes or even infections such as shingles.

Brachial neuralgia (nerve pain in the arm) is very similar to sciatica, but comes from the neck nerves. Radicular pain is a term doctors use to describe pain when it is mainly from a single nerve root.

This information is intended for those who generally suffer from nerve pain rather than back pain. Very often, nerve pain and back pain are present at the same time. If the pain in the limb is worse than the back pain, it is more likely to come from the nerve.

SOME COMMON PATTERNS OF NERVE ROOT PAIN IN THE LEG

Many patients seem to recognize the nerve pain they have from this diagram, but please remember it is only one part of the diagnosis of nerve pain.

Nerve pain can range from severe to quite mild pain. Sometimes it has a specific characteristic such as burning or pins and needles. Some patients find the pain is worse if they cough or sneeze. It may be worse in certain positions and better in others. Some activities such as walking or gentle cycling may ease the pain, while sitting or laying still can make it worse.

In addition to the pain, other nerve functions can also be affected. Numbness or altered sensation is common. Muscle weakness can also occur.

The S1 nerve weakness can affect the calf muscle or the muscles around the outer ankle, causing a limp.

The L5 nerve weakness will sometimes affect the ability to lift the big toe.

The L4 nerve weakness can affect the muscles that lift the foot; a severe weakness is called a foot drop.

Although quite frightening, many episodes of sciatica get better fairly quickly on their own.

HEALING

When a disc prolapses (or slips), it loses its normal nutrition of fluid and therefore shrinks quite quickly.

A disc prolapse can be thought of as a piece of moist fish/meat left on a plate, shrivelling up and shrinking in size.

The part of the disc that is left behind will often repair itself.

As people get older their discs become stiffer and have less jelly, which is why disc prolapses are less common in older people.

The best way to deal with the problem is to exercise sensibly, stay active, avoid being overprotective and lead as normal a life as possible.

DIAGNOSIS

In the initial stages, most patients only need to see their GP. The diagnosis is made largely from the symptoms and the initial examination.

Here are some of the common examination findings:

Spinal movements produce limb pain. For instance, in the case of lumbar nerve root pain (sciatica), bending down to touch one's toes causes the pain to spread to the leg.

Nerve stretching tests causes pain to spread down the limb.

Simple tests of the function of the nerve (e.g. power, reflex and sensory tests) help identify which nerve is likely to be the one causing the pain. Healthcare professionals perform these tests as part of the diagnosis.

The severity of nerve root pain is NOT related to how large the disc is and can vary a great deal. Distress and fear often worsens the pain. In order to understand how best to deal with sciatica, sound information is vital.

Sciatica generally gets better; the only situation, in which it is considered an emergency, is when there is numbness between the legs or difficulty with bladder or bowel control.

LOSS OF SENSATION BETWEEN THE LEGS AND AROUND THE BUTTOCKS
OR LOSS OF CONTROL OF THE BOWELS OR BLADDER
OR BOTH

THIS IS AN EMERGENCY – IT IS RARE, BUT IF IT OCCURS, IT MUST BE DEALT WITH PROMPTLY

IT'S CALLED CAUDA EQUINA SYNDROME

THE MAIN POINTS OF NERVE ROOT PAIN

Pain spreads to the leg or arm, generally below the knee or elbow.
Pain is often associated with altered sensations, pins and needles, burning or numbness.
Pain in the leg or arm lasts for long periods.
Coughing and sneezing can make the limb pain worse.
The limb pain is the main pain.

What is a prolapsed disc?

The intervertebral discs have a jelly-like centre (the pulposus), which can ooze through a tear in the strong gristle of the disc (the annulus). The jelly then compresses the nearby nerve root and inflames it, causing pain in the area of the limb supplied by the nerve.

PROGNOSIS

Fortunately, most episodes do not last long. Medication and therapeutic measures can help, but there is no usual quick fix. Natural recovery has to take place. Most patients improve within six weeks of the start of the symptoms in the limb.

By thirteen weeks, the majority of patients show considerable improvement and are virtually back to normal, but low-grade symptoms may sometimes persist for several months.

If the pain ‘centralizes’ or moves away from the limb towards the spine, this is a sign of improvement.

THINGS THAT MAY HELP; MANY OF WHICH SHOULD BE DISCUSSED WITH THE DOCTOR

Specialist's opinion:

1) If non-operative treatment is indicated the measures to be taken are rated as follows: (useless: 0, extremely helpful: 100)

“Normal pain killers”	86 %
Non-steroidal anti-inflammatory drugs	100 %
Muscle relaxants	63 %
Corticosteroid medication	64 %
Nerve pain medication (gabapentin or similar)	62 %
Physiotherapy	83 %
Manual therapy	52 %
Traction	32 %
Epidural injections	76 %
Nerve root injections	81 %
Other	2 %

Total: 49 Specialists answered

DRUG TREATMENTS

Medication is used to help with the pain and can improve your quality of life while healing takes place.

Effective drugs include non-steroidal anti-inflammatory drugs, pain-relieving drugs, nerve pain-relieving drugs and (if a spasm is present) muscle relaxation drugs. For additional advice, please see our booklet “Routine medications for musculoskeletal problems”.

Not all of these medications are always necessary. Exact decisions on what you need are made by your GP/hospital doctor. Very often, a combination of different medications taken regularly can provide an umbrella of pain relief. This is more helpful than just taking tablets when the pain is really bad. It is easier to keep pain away, rather than trying to get rid of it once it starts.

One type of medication from each of the three main groups can be combined with medication from the other groups

Anti-inflammatories: Non-steroidal anti-inflammatory drugs (NSAIDs)
Simple analgesics: Paracetamol, co-codamol, co-dydramol
Nerve pain medication: Amitriptyline, gabapentin

PHYSIOTHERAPY AND MANUAL THERAPIES

Assessment and good advice regarding correct posture and lifestyle are usually given early in the episode. In some cases, manual therapy may even cause symptoms to increase and not help much.

If most of the limb pain has subsided, then such treatment can be considered to ease any residual stiffness, and progressively reactivate and rehabilitate back to full function.

Certain exercises can sometimes be very helpful – McKenzie’s exercises seem to help reduce leg pain in some patients.

INJECTION THERAPY

Injection therapy is usually only required if the problem does not settle satisfactorily after an appropriate period of time.

These treatments can be provided by a variety of specialists, including rheumatologists, pain management anaesthetists, radiologists and orthopaedic surgeons.

The two injection techniques most often employed are:

1. Epidural injections into the space around the nerves in the spine and the spinal canal. These can be lumbar or caudal.

2. Nerve root canal injections are more specific to the affected nerve and require x-ray control to locate where the irritated nerve exits the spine. These are sometimes called peri-radicular injections or foraminal epidurals.

Both injection techniques have the aim of relieving pain and inflammation in the nerve, while natural healing continues. They can be repeated if required. Both methods seem equally safe. Complications are uncommon, but can include infection or damage to nerves or blood vessels.

TREATMENTS THAT DO NOT WORK OR MAY BE HARMFUL

Traction
Manipulation of the spine under anaesthesia

SURGERY

Specialist's opinion:

2) The best timing for surgery for nerve root pain that is not improving is:

Less than four weeks	4 votes
4-8 weeks	22 votes
8-12 weeks	16 votes
After 3 months	6 votes
Before one year	1 votes

Total: 49 Specialists answered

3) Surgery for radiologically confirmed nerve root compression should be advocated if the following concordant symptoms are present

Uncontrollable pain with sensory deficit	33 votes
Uncontrollable pain with motor deficit	44 votes
No pain but motor deficit	20 votes
Controllable pain with sensory deficit	3 votes
Controllable pain with motor deficit	25 votes
Cauda equina syndrome	41 votes

Total: 48 Specialists answered

The majority of patients get better without surgery. In most cases, the pain subsides with time.

Surgery can be very helpful if the pain doesn’t settle with simpler measures. An operation is the most reliable way to reduce the leg pain quickly, but surgery does have some associated risks.

Specialist's opinion:

4) The following statements apply to the comparison between surgical treatment and non-surgical treatment for sciatica (completely false: 0, completely true: 100)

Muscle weakness gets better quicker	74 %
Pain gets better quicker	100 %
Sensory deficit gets better quicker	59 %
Less risk of recurrence	47 %
Improved long-term outcome	38 %
The benefit always outweighs the risks	49 %
The results are better with early surgery	53 %