If you’ve been told your sciatica is caused by a herniated disc or a misaligned spine, you’re not alone. It’s the most common explanation active adults in the Bay Area hear about that sharp, electric pain running from the low back down the leg. It’s also, according to a growing body of research, often the wrong explanation.
That doesn’t mean your pain isn’t real. It absolutely is. It means the story behind it is more complex than “your disc slipped out of place.” Discs don’t slip. Spines often don’t go crooked or zig-zag like a staircase. And once you understand what’s actually driving sciatic nerve irritation, you can start treating the source instead of chasing a scapegoat on an MRI report.
What Sciatica Actually Is
Sciatica is not a diagnosis. It’s a symptom: pain, tingling, numbness, or weakness that travels along the path of the sciatic nerve, which runs from your lower back through your glute and down the back of your leg. Something is irritating that nerve somewhere along its route. The question worth asking isn’t “how do I fix my disc?” It’s “where along this nerve’s path is the actual problem, and why is this nerve sensitized.”
The Imaging Doesn’t Match the Pain (And That’s Been Known for Decades)
Here’s where things get uncomfortable for the disc narrative. Multiple studies, including a widely cited body of research published in journals like Spine and the American Journal of Neuroradiology, have found disc bulges and herniations on MRI in a large percentage of people who have zero back pain at all. One frequently referenced study found disc abnormalities in roughly a third of asymptomatic adults under 40, and the rate climbs with age. Plenty of 60-year-olds with “textbook” degenerative discs on imaging are out there hiking, lifting, and living pain-free.
What this tells us: an MRI finding and a symptom are two different conversations. A disc bulge can be a bystander, not the culprit. This is also why the term “misaligned” doesn’t hold up under scrutiny. Your spine isn’t a Jenga tower 1 piece away from a collapse. It’s a load-bearing structure that responds to how you move, how you load it, and how well the tissues around it are doing their job. Pain is a whole system problem, not a single structure malfunctioning.
We say this not to dismiss your pain, but to free you from chasing the wrong target. If we spend a session obsessing over what a static image shows and ignore how you actually move, we’re treating a snapshot instead of a person.
Why “Just Strengthen Your Core” Often Falls Short
Core strength gets prescribed for almost everything with a spine involved, and sometimes it helps. But for a lot of the sciatica cases we see, it’s not the core treatment (pun intended), because the source of the irritation isn’t coming from a weak midsection. It’s coming from below.
Think about what happens every time your foot hits the ground when you walk or run. That impact sends a force up through your foot, ankle, knee, and hip before it ever reaches your spine. If your hip isn’t doing its job, specifically the glute medius and glute max controlling your femur and pelvis, that force has to go somewhere else. Often it gets absorbed by tissues that were never meant to be the shock absorber: the lumbar spine, the piriformis, the structures right along the sciatic nerve’s path.
We see this constantly with runners and weight lifters. Their “back problem” actually started at the foot. Poor hip control lets the femur collapse inward with every step, the pelvis compensates, and over thousands of repetitions the tissue around the sciatic nerve gets cranky. A person can have a rock solid set of abs and still develop sciatic symptoms because their hip is under recruiting and their foot mechanics are sending the wrong signal up the chain, mile after mile, rep after rep
This is why a real assessment has to look at the whole kinetic chain: how your foot loads, how your hip fires, how your gait pattern behaves under fatigue, not just whether you can hold a plank.
How We Approach It at R3
Every evaluation starts one-on-one with a Doctor of Physical Therapy, not a tech running you through a generic checklist. We’re looking at your gait, your hip strength and control, your foot mechanics, your specific sport demands, and how your nervous system is responding to load, then building a plan that targets the actual driver of your symptoms.
For a lot of clients, that means retraining hip stability and loading patterns so the sciatic nerve stops getting irritated with every step. For clients whose nerve tissue is already sensitized or slow to calm down, we also bring in regenerative tools that go beyond traditional rehab alone.
Where Shockwave and EMTT Fit In
Shockwave therapy and EMTT, or Extracorporeal Magnetotransduction Therapy, are two of the regenerative tools we use at R3 when standard rehab needs an assist. Shockwave uses focused or radial acoustic waves to stimulate blood flow and cellular repair in irritated soft tissue. EMTT uses a pulsed electromagnetic field to support tissue metabolism and reduce inflammation at a deeper level, without the discomfort that can come with more aggressive manual techniques.
Emerging research on nerve tissue suggests these modalities may support the healing environment around an irritated or compressed nerve by improving local circulation and reducing inflammatory signaling. We’re careful here: neither is a guaranteed fix, and neither replaces addressing why the nerve got irritated in the first place. What they can do is accelerate the healing process while we correct the mechanical driver, whether that’s hip strength, foot mechanics, or gait.
When Sciatica Needs More Than PT
Most sciatica resolves with the right rehab and time. Some cases, particularly with significant weakness, loss of bowel or bladder control, or progressive nerve symptoms, need physician involvement. When that’s the case, we coordinate directly with your doctor so your rehab and any medical decisions are working together, not in separate lanes.
Ready to Find Your Actual Source?
If you’ve been told your sciatica is a disc problem or an alignment problem and the fix hasn’t stuck, it might be time to look at the whole chain: foot, hip, and how they’re talking to your lower back with every step you take.
R3 Athletic and Physical Therapy is a sports-focused practice in Milpitas, serving active adults and athletes across the Bay Area. Book a discovery call and let’s find out what’s actually driving your symptoms, not just what a report says.
Need Help Now?
At R3 Athletic & Physical Therapy, we specialize in helping active individuals recover faster and stay injury-free—without relying on medications or surgery.
We offer a FREE Discovery Visit to help you figure out what’s going on, why it’s happening, and what you can do about it.
Book your free visit today and take the first step toward a pain-free future.