Few words on a scan report cause more worry than "disc herniation" or "disc prolapse". Add sharp, burning pain running down the leg, often called sciatica, and it's natural to wonder whether surgery is the only way out.
For some people, surgery is the right call. For many others, the body is capable of far more recovery than they expect. Here's what the research actually tells us, and how to know which path might suit you.
First, what is a disc herniation?
The discs between the vertebrae in your lower back act like tough, flexible cushions. Each has a strong outer ring and a softer, gel-like centre.
A herniation happens when some of that inner material pushes out through the outer ring. If it irritates or presses on a nearby nerve, it can cause pain, numbness, pins and needles or weakness in the buttock and leg.
As we've covered in earlier articles, disc changes are also extremely common in people with no pain at all. A scan finding alone isn't the whole story. What matters is how it lines up with your symptoms and your examination.
When surgery is needed urgently
There are some situations where surgery, or an urgent surgical opinion, is clearly the right step. These are uncommon, but important to know.
Go to the emergency department straight away if you have back or leg pain along with:
New difficulty passing urine, or loss of bladder or bowel control
Numbness in the groin, genitals, inner thighs or around the back passage (sometimes called "saddle" numbness)
Sudden or worsening weakness in one or both legs
Symptoms in both legs that are getting worse
These can be signs of cauda equina syndrome, a serious compression of the nerves at the base of the spine. It's a medical emergency.
Get a prompt medical review if you have:
Weakness that is clearly getting worse, such as foot drop or a leg giving way
Severe pain that can't be controlled despite appropriate care
What happens to most disc herniations over time
For the majority of people without these warning signs, the outlook is encouraging.
Research shows that herniated disc material is often reabsorbed by the body over time. A systematic review published in Clinical Rehabilitation found spontaneous regression in 96% of sequestrated discs, 70% of extruded discs, 41% of protrusions and 13% of disc bulges. Interestingly, the larger, more dramatic herniations were the most likely to shrink on their own.
This is one reason most clinical guidelines recommend starting with conservative care for people without serious or progressive nerve problems. Australia's Low Back Pain Clinical Care Standard, developed by the Australian Commission on Safety and Quality in Health Care, emphasises education, staying active and self-management, and highlights the limited role of imaging, bed rest, pain medicines and surgery for most people presenting to primary care with low back pain.
Surgery vs conservative care: what the trials show
Several major studies have compared surgery, usually a microdiscectomy, with non-surgical care for sciatica caused by a disc herniation. Taken together, they paint a fairly consistent picture.
Surgery tends to give faster relief
In a well-known Dutch trial published in the New England Journal of Medicine in 2007, 283 people who had severe sciatica for 6 to 12 weeks were randomly assigned to either early surgery or prolonged conservative care, with surgery later if needed.
Those who had early surgery had faster relief of leg pain and recovered sooner. But at one year, outcomes were similar between the two groups, and about 95% of people in both groups reported they had recovered. Around 39% of the conservative group did go on to have surgery, after an average of about 18 weeks.
Long-term differences are often modest
The large US Spine Patient Outcomes Research Trial (SPORT) followed more than 1,200 people with disc herniations for eight years. People who had surgery generally reported somewhat greater improvement in pain and function than those who didn't, with the benefit appearing within six months and holding steady over time.
However, many people treated without surgery also improved substantially and stayed that way. About a third of people who were considered surgical candidates chose not to have surgery, and many remained satisfied with that choice years later.
An earlier landmark Norwegian study by Weber in 1983 reported a similar pattern: surgery gave better results at one year, but the difference between surgical and non-surgical groups faded by the four and ten year follow-ups.
Surgery may help more when sciatica has lasted a long time
A 2020 Canadian trial, also published in the New England Journal of Medicine, looked at 128 people whose sciatica had lasted 4 to 12 months. Those who had a microdiscectomy had significantly lower leg pain at six months than those who had six months of structured non-surgical care, and the difference was still present at one year.
This suggests that for people with persistent, disabling sciatica that hasn't improved with good conservative care over several months, surgery can be a very reasonable option.
So, what does this all mean?
Putting the evidence together:
Urgent surgery is needed for cauda equina syndrome and severe or progressive nerve weakness.
Most people with sciatica from a disc herniation improve without surgery, and many herniations shrink on their own.
Surgery usually gives faster relief, which can matter a lot if pain is severe or you need to get back to work quickly.
Over the longer term, the gap between surgery and conservative care is often small, though some studies favour surgery.
For persistent sciatica lasting several months despite good conservative care, surgery may offer meaningful benefit.
In other words, for most people it isn't a question of right or wrong. It's a shared decision based on how severe your symptoms are, how long they've lasted, how you're progressing, your work and lifestyle, and your own preferences about the risks and benefits.
What good conservative care looks like
Conservative care isn't just waiting it out. Good care is active and structured, and usually includes:
A thorough assessment, including checking your nerve function so any changes can be picked up early
Clear explanation of what's going on and what to expect
Advice on staying active and modifying activity, rather than bed rest
Hands-on care where appropriate to help manage pain
A progressive exercise program to rebuild strength, mobility and confidence
Support with return to work and everyday activities
Coordination with your GP for pain relief and, where needed, referral to a spinal surgeon
How our team can help
At Epoch Health, our chiropractors, physiotherapists and exercise physiologists work with people with disc-related back and leg pain every week.
We'll assess your symptoms and nerve function, explain what we find in plain language, and build a plan that fits your goals. We'll monitor your progress closely, and if your symptoms suggest you need a surgical opinion, we'll work with your GP to make sure you're referred promptly.
Whether your path ends up being conservative care, surgery, or a combination of both, our aim is to help you make an informed decision and recover with confidence.
Book an appointment at our Dundas Valley or Telopea clinic: epochhealth.net.au/bookings
This article is general information only and isn't a substitute for personalised health advice. Decisions about surgery should always be made with your GP and a spinal surgeon. If you have any of the emergency symptoms listed above, go to your nearest emergency department immediately.
References
Chiu CC, et al. The probability of spontaneous regression of lumbar herniated disc: a systematic review. Clinical Rehabilitation. 2015;29(2):184–195.
Peul WC, et al. Surgery versus prolonged conservative treatment for sciatica. New England Journal of Medicine. 2007;356(22):2245–2256.
Lurie JD, et al. Surgical versus nonoperative treatment for lumbar disc herniation: eight-year results for the Spine Patient Outcomes Research Trial. Spine. 2014;39(1):3–16.
Weber H. Lumbar disc herniation: a controlled, prospective study with ten years of observation. Spine. 1983;8(2):131–140.
Bailey CS, et al. Surgery versus conservative care for persistent sciatica lasting 4 to 12 months. New England Journal of Medicine. 2020;382(12):1093–1102.
Australian Commission on Safety and Quality in Health Care. Low Back Pain Clinical Care Standard. 2022.