QUICK ANSWER (TL;DR)
A disc bulge is a generalised, age-related widening of the entire outer disc ring. A disc herniation is a focal tear where the soft inner gel pushes through the outer ring. Most disc bulges are normal age-related findings — present in 60% of pain-free 50-year-olds. Imaging findings ≠ pain. Pilates is generally safe and beneficial for both, with appropriate progression.
If you’ve ever walked out of a radiologist’s office with an MRI report that says “disc bulge” or “disc herniation”, you’ve probably had two thoughts: what does this actually mean, and what am I allowed to do now?
Read more: Disc Bulge vs Disc Herniation: What’s the Difference and Why It MattersSame questions arrive in our studio every week. So let’s clear it up using science.
What’s the Difference Between a Disc Bulge and a Disc Herniation?
A disc bulge is a generalised extension of the outer ring of the disc beyond the vertebral body usually involving more than 25% of the disc’s circumference. It’s most often a normal age-related change. A disc herniation is a focal (less than 25%) displacement of the inner nuclear material through a tear in the outer ring.
Two different things that require have two different healing approaches. But are often confused with each other.
What’s Inside an Intervertebral Disc?
Each intervertebral disc has two main parts. The annulus fibrosis – the outer ring made of layered collagen fibres. And the nucleus pulposus – the soft, hydrated, gel-like centre that absorbs the load. The vertebral endplates (the cartilage caps connecting each disc to the vertebra above and below) finish the structure.
When something “goes wrong” with a disc, it almost always involves one of those two parts.
Disc Bulge: The Definition
A disc bulge is a generalised extension of the annulus beyond the vertebral body margins – usually involving more than 25% of the disc’s circumference. The disc is essentially squashed wider, but the nucleus is still where it’s supposed to be.
This is most often a degenerative change associated with normal ageing. The wrinkles of the spine, in a sense.
Disc Herniation: The Definition
A disc herniation is a focal (less than 25% of the circumference) displacement of nuclear material through a defect in the annulus. Sub-categories matter:
• Protrusion — base of the displaced material is wider than the displacement itself
• Extrusion — displaced material is narrower at the base than at the dome
• Sequestration — herniated fragment has separated entirely from the parent disc
How Common Are Disc Bulges in People Without Back Pain?
Surprisingly common. Brinjikji et al. (2015) systematically reviewed imaging findings in people with no back pain at all. The headline numbers:
• Disc bulges in 30% of pain-free 20-year-olds
• Disc bulges in 60% of pain-free 50-year-olds
• Disc bulges in 84% of pain-free 80-year-olds
None of these people had pain. Imaging findings are a poor predictor of pain. Many “abnormal” discs are simply normal age-related changes.
Can You Do Pilates With a Bulged Disc?
Yes, in almost all cases, Pilates is safe and beneficial for people with disc bulges. Pilates allows progressive loading in supported positions, with breath integration, in environments where the practitioner can observe and adjust in real time. The reformer in particular gives us graded resistance through ranges that would be too provocative unloaded.
The exception: if you have signs of nerve root compression like radiating pain, numbness, weakness in an arm or leg – speak with your doctor or physio before starting, and seek a studio that does an initial consultation rather than dropping you into a group class.
What Should You Avoid If You Have a Disc Issue?
The old advice to “never flex with a disc issue” isn’t supported by current evidence. Discs are designed to handle load through flexion, extension, and rotation. Graded, controlled exposure is what builds tolerance.
What to be cautious of:
• Sudden, unloaded end-range flexion (like rapid forward folds without support)
• Heavy loading combined with rotation in unsupported positions
• Any movement that reproduces radicular symptoms (pain travelling down a limb)
What’s generally fine and often beneficial is everything that’s progressive, supported, and matched to your current abilities.
Frequently Asked Questions
Is a bulged disc the same as a slipped disc?
No. “Slipped disc” is a colloquial term that doesn’t accurately describe what happens because discs don’t slip. The term is most often used loosely to mean either a bulge or a herniation. The accurate medical terms are disc bulge and disc herniation.
Can a disc bulge heal on its own?
Most disc bulges and many herniations resolve or significantly improve without surgery. Research shows that herniated material can be reabsorbed by the body over months. Conservative care, including movement and rehabilitation, is the first line of treatment in most cases.
How long does it take to recover from a disc herniation?
Most people improve substantially within 6 to 12 weeks of conservative care. Full tissue remodelling can take 6 to 12 months. Symptoms often improve faster than imaging changes, which is one reason imaging shouldn’t drive your training decisions on its own.
Should I get surgery for a bulged disc?
Surgery is rarely needed for a bulged disc alone. It’s generally reserved for cases with progressive neurological deficit, severe disabling pain that doesn’t respond to conservative care, or specific structural concerns. Always seek opinions from your medical team.
Is Pilates good for back pain in Sydney?
Yes! Clinical Pilates with appropriate assessment is well-supported by research for chronic low back pain. At our Sydney CBD studio, we begin every client with an initial consultation to understand their specific history, imaging, and goals before designing a program.
The Bottom Line
We don’t treat the MRI. We treat the human standing in front of us, with the MRI as one piece of context. The picture in the report is a snapshot. The body in the studio is a living system that adapts, heals, and responds.
Disc language can scare people. But it doesn’t have to if you chose wisely. We definetly do.
References