Straight leg raise for sciatica

The straight leg raise for sciatica was first named Lasegue's test some 200 years ago after the Frenchman of that name.

The SLR as it is often abbreviated has become the gold standard for a herniated lower lumbar disc though in fact it's not very specific; other conditions can produce a positive Lasegues.

It is used for the patient suffering primarily with acute lower back pain that radiates down the back or outer side of the leg, sometimes affecting either the side of the foot, the sole and the great toe area.

Nevertheless, it's equally appropriate for the patient with low back pain only, or primarily leg pain.

It is done in conjunction with the Slump Test which is done sitting producing slightly different and sometimes mystifying results. Both should really be done, but a full and thorough examination of the patient in very severe pain will often worsen the symptoms.

For this reason, the Slump test for sciatica is often the clinician's first choice in the clinic; it is less traumatic to test the sitting patient.

However, on examining the patient at home, where he will almost certainly be lying down, Lasegue's is more usually the test done for sciatica.

The sciatic nerve has five roots; L4, L5, S1, S2 and S3.

An angle is used to designate at what level the pain begins; clinical notes should state clearly if the restricting pain is in the lower back, the leg, or both. Clearly a SLR of 10 degrees is more severe than 50.

Straight leg raise

The straight leg raise is for sciatica.

If the patient is standing, he is asked to sit, then gently lie on his side, and roll onto the back. All of this can be very traumatic for the patient in severe pain.

The patient is then asked to relax completely; the test is done passively. The doctor raises the straight leg on the non painful side to establish what is a normal tight hamstring and calf. The doctor then lowers the leg gently; bending the knee a little helps to prevent sharp stabs of pain whilst the leg is being lowered, should the patient attempt to take weight.

The doctor then slowly raises the straight leg on the painful side; the patient indicates when and where the pain begins.

Most usually the pain in the back or leg begins at around 30 degrees, depending on the severity of the bulging disc. Lower lumbar discs tend to produce pain at a smaller angle.

The disc can herniate in one of two ways; lateral or medial to the nerve root. Clinically these are quite different conditions; they present in contrasting ways, and they respond to chiropractic treatment in diametrically distinct manners.

Both however take a minimum of six weeks for the annulus fibrosis to heal.

A intervertebral disc consists of two parts; an outer ring called the annulus fibrosis and an inner bubble of gel called the nucleus pulposis.

In the so called slipped disc, part of the nucleus pulposis ruptures through the intermeshed fibres of the annulus. It is in effect a sprain so swelling and inflammation soon begin.

For this reason the patient may go to bed at night with only slight discomfort after lifting a heavy cupboard, say, but in the morning may have a very strong straight leg raise sign and have grave difficulty getting out of bed; dressing may be well nigh impossible.

The sciatic nerve root lies just behind the disc. Should the swelling be sufficiently severe it may impinge on the nerve root causing symptoms following the course of the sciatic nerve.

Chiropractic help verses medicine

Chiropractic help attempts to treat the cause of the pain. NSAIDs for a broken limb is not the treatment of choice, though there may be inflammation. The bone needs to be splinted.

Medicine tends to view sciatica primarily as an inflammation, so the treatment of choice is anti inflammatory drugs.

Chiropractic on the other hand sees this as something mechanical, more akin to torn ankle ligaments or even a broken bone. The treatment is directed at reducing the bulging disc.

Lasegue's test

The straight leg raise gives a good objective measure of how the patient is responding; the attending doctor should be able to raise the leg higher and higher before the pain begins.

Crossed straight leg raise

Elsewhere we will describe this condition, but briefly, raising the opposite leg may be more painful than raising the leg on the painful side.

Braggard's test

A positive straight leg test only confirms in about a quarter of cases that the patient has a slipped disc; other terms used might be bulging, protruded, prolapsed and extruded disc, meaning different things. However, a positive test of Braggard, in conjunction with a positive straight leg raise test is strongly suggestive of an injured disc.


Strictly speaking, the word antalgia means leaning away from the painful side to relieve the pain; it's sometimes called the Pisa sign, after the famous leaning tower. The patient is quite unable to straighten up.

However, in the case of the medial disc, the patient actually leans towards the painful side.


Nerve damage often causes either numbness or weakness in the leg. If you are having difficulty raising your big toe, or the knee is collapsing on the stairs, or even if you have a distinct limp, then paresis, or semi paralysis of the muscle may be developing.

Our leg pain muscle testing page will help you work it out.

Useful links

» » Straight leg raise

Did you find this page useful? Then perhaps forward it to a suffering friend. Better still, Tweet or Face Book it.

Interesting challenges of the day

1. Mr S is a 76 year old man with neck pain of some 9 months duration. Luckily, most of the discomfort is upper cervical which is only rarely arthritic; his lower cervical spine is a degenerative mess that I've left alone. After seven treatments his pain and stiffness is 50 percent better, and he's happy in the circumstances. He can sleep through the night now and that makes a huge difference.

2. Mr P is 32 year old man with very severe lower back pain radiating to the big toe which is 30 percent numb. He had an episode three weeks ago, took anti inflammatories and was soon better as is typical of the medial disc herniation. But before it healed, after a trivia it came roaring back, much worse. The characteristic crossed sign was evident; sitting in a chair, straightening the right leg provoked severe left back pain and tingling in the leg. He's doing well.

3. Severe lower back pain is scary; just ask Mrs P. Just watching her get out of the car I she was in trouble; she had a slipped disc at L4 making her lean towards the opposite side; luckily she had no pain in the leg. Despite family pressure that this was far too severe for a chiropractor, she persevered. Within five days she was standing upright, and after two weeks almost painfree. 

Despite a hectic job, she wisely took my advice and stayed home for what I call exercising bed rest.

4. Mr S has had lower back, groin and back of thigh and calf pain for fourth months.

He has a pincer deformity in the hip causing the stabs in the groin, and a degenerative facet causing the sciatica. Both are responding well to chiropractic and he's well pleased; sixty five percent better after three treatments.

5. Mr T is a wise man; he's taken a warning TIA seriously and has lost 15 pounds, and has at least as much again to lose. A change to a low starch diet and half hour daily walk has made the difference; but the walking is making his foot and back miserable. The expensive orthotic is hopeless; luckily his hips and back are fine, but he needs a simple heel lift.

6. I too have had serious lower back issues, luckily fixed by my own chiropractor; so I too have to do my exercises, take care when lifting supers full of honey, gardening and using the chainsaw. Regaining the function of your spine is just as important as the pain.

7. My own granddaughter, only 7 is hypermobile giving her pelvic, knee and ankle issues. Xrays show a mildly dysplastic hip. Years ago we would have called it growing pains. She too regularly needs chiropractic care and luckily responds well. Increased range of motion is more difficult than too stiff in my opinion. Our care is for kids too.

8. This 65 year old lady is a serious gardener; every day she is bending, lifting and digging for 2 to 3 hours a day. It regularly catches her in the sacroiliac joint, so she has a treatment once a month that sorts it out. She does her lower back exercises faithfully.

9. This 88 year old lady is an inspiration; every day she is busy in the community. With a nasty scoliosis she manages very well with a chiropractic adjustment every six weeks and exercises faithfully done.  

10. Mr X is a 71 year old retired man who wants to continue with maintenance care every six to eight weeks; he had suffered from two years of lower back pain when he first came a year ago. He has no discomfort now after 8 chiropractic treatments, but is aware that danger lurks.

11. Mrs C has been having severe headaches, and taking a lot of analgesics. It's a non complicated upper cervical facet syndrome, and she's doing well.

12. Mr D is a 38 old year man with chronic shoulder pain after a rotator cuff tear playing cricket. It responded well to treatment, but he knows he must do his exercises every day; for two years he couldn't sleep on that shoulder.

13. Mr D, a 71 year old man, has a severe ache in the shoulder and midback since working above his head. Trapped nerve tests are negative but he has advanced degenerative joints of Luschka; after just two treatments he is 50 percent better. Can we reach 90?

And so the day goes; chiropractors shouldn't be treating the elderly most medical sites state but that's so much bunkum.

Have a problem that's not getting better? Looking for a different slant on your pain? Want to pose a question?

Interesting questions from visitors

CLS writes:

Greetings, Dr B.
You helped me quite some time back with a soothing and professional response which turned out to be exactly correct. I now consult a local chiropractor. You write a superb newsletter, too.

Your own unresolved problem. Pose a question

Knowing that up to 70% of the time the correct diagnosis is made with no examination, no special tests, no xrays, but just from the history, there's a fair chance I can add some insight to your unresolved problem. But at least 30% of the time, I may be quite wrong! Give plenty of detail if you want a sensible reply.

You visited this chiropractic help site no doubt because you have a problem that is not resolving and want to know more about what chiropractors do.

The quickest and most interesting way is to read one of my ebooks of anecdotes. Described by a reader as gems, both funny and healthful, from the life and work of a chiropractor, you'll love them. Priced right at $2.99, though Kindle fiddles the price without telling me.