Posturography and stabilometry — how we measure your balance

posturography and stabilometry matters because patients searching for posturography and stabilometry usually want to know what it means, what causes it, and when it needs medical review.

posturography and stabilometry: what patients should know

Stabilometry measure is something I see regularly in my practice. Balance is complicated. More complicated than most people realize.

You’re not balancing because your inner ear alone is working. You’re balancing because your inner ear, your eyes, your proprioception (body position sense), and your muscles are all talking to each other, making tiny adjustments thousands of times per second.

When that system breaks down, you fall. Or feel like you’re about to.

For years, I could test parts of the system — VNG for eye reflexes, caloric test for the semicircular canals, VEMP for the gravity sensors. But I couldn’t test the whole system actually staying upright.

Then came stabilometry. And posturography. These tests measure what actually matters: can you stand without falling?

What Stabilometry Actually Measures: Stabilometry Measure

Stabilometry is simple in concept, sophisticated in execution.

You stand on a platform — it looks like a bathroom scale, but it’s far more sensitive. The platform has pressure sensors. Dozens of them. Arranged in a grid.

When you stand on it, those sensors measure exactly where your weight is distributed. Moment by moment. Sometimes 100 times per second.

The computer calculates something called the “center of pressure” or COP. It’s the point where your weight is concentrated. In a normal person standing still, that point is fairly stable — near the center of your base.

But you’re not perfectly stable. Nobody is. Even standing still, you sway. Tiny corrections. Tiny weight shifts.

Stabilometry measures that sway. How much? How fast? Which directions?

The result is a number: COP velocity, measured in millimeters per second. A normal person standing still might have COP velocity around 15-25 mm/s.

A patient with balance problems? Might be 50, 70, 100 mm/s or higher. Their system is making bigger corrections. Struggling to stay upright.

Why This Matters Clinically

At Prime ENT Center, we have a stabilometry platform. I use it constantly.

Here’s why: some patients feel dizzy or unsteady, but all their other tests are normal. vHIT normal. Caloric normal. VEMP normal.

So where’s the problem?

Stabilometry sometimes finds it. It shows objective instability even when the individual inner ear tests are normal. Because balance isn’t just the inner ear. It’s the whole system.

I had a patient from Farrukhabad with persistent imbalance after a Vestibular neuritis. Six months passed. Her VNG and caloric had recovered. She felt “mostly better.” But she was still afraid to walk without holding walls.

I did stabilometry. COP velocity was 65 mm/s — well above normal for her age.

That told me: her vestibular compensation was incomplete. Her body hadn’t fully adapted yet. I prescribed specific vestibular rehab exercises targeting balance control (not just eye reflexes), and within four weeks, her COP velocity was down to 35 mm/s.

The stabilometry gave me objective proof that rehab was working.

Posturography and Sensory Organization

Posturography is stabilometry with a twist. You’re tested under different sensory conditions.

Eyes open, standing still. That’s easiest.

Eyes closed, standing still. Harder. Now you can’t use vision.

Eyes open, but the room around you moves while the platform stays still. Tricky. Your eyes tell you one thing (room moving), your balance says another (platform stable).

Eyes closed, platform moving beneath you. Very hard. You’ve lost vision and proprioception cues.

Each test gets progressively more difficult. Each one requires more reliance on different sensory systems.

A patient with central (neurological) problems might fail the eyes-closed test but pass eyes-open. A patient with pure inner ear problems might fail the moving-platform test but pass the static tests.

This pattern discrimination helps me understand what’s actually broken.

The Foam Test — Poor Man’s Posturography

Not every clinic has a sophisticated posturography setup. We do at Prime ENT Center. But many don’t.

So I use a simple bedside version. Romberg test with eyes closed. Then Romberg on a foam pad (soft, unstable surface). If they can’t stand on foam with eyes closed, that’s a posturography finding. It tells me balance is compromised.

The foam is cheap. The test is quick. And it gives real information.

How Stabilometry Helps in Specific Conditions

**BPPV:** Most BPPV patients have normal stabilometry when the BPPV is recent and severe — they’re afraid to move. But if it’s chronic or partially treated, stabilometry shows improvement as I treat them.

**Vestibular neuritis:** Acute phase, stabilometry is terrible. Both eyes closed and platform moving, they fail. But tracking recovery is beautiful. Week 2: still bad. Week 4: improving. Week 8: almost normal.

**Meniere’s disease:** Stabilometry is often abnormal even between vertigo attacks because of the chronic inner ear inflammation. Worse during attacks.

**Migraine-related dizziness:** These patients often have normal inner ear tests but abnormal posturography. Their problem is sensory processing, not a damaged organ.

**Age-related imbalance:** Older patients lose proprioception and vestibular function. Stabilometry objectively shows the decline and helps track whether balance training is working.

The Numbers and What They Mean

COP velocity under 20 mm/s: Excellent balance.

COP velocity 20-30 mm/s: Normal for age.

COP velocity 30-40 mm/s: Mild imbalance, especially if other factors are present (age, medication).

COP velocity 40-60 mm/s: Clear imbalance. Risk of falls. Treatment needed.

COP velocity 60+ mm/s: Significant dysfunction. High fall risk. Intensive intervention required.

But context matters. A 75-year-old with COP velocity of 45 mm/s is less concerning than a 45-year-old with the same number. Expectations change with age.

Posturography for Fall Risk Assessment

Here’s something many doctors don’t think about: dizziness tests are often not about the dizziness itself. They’re about fall risk.

An 80-year-old who falls and breaks a hip — that’s catastrophic. A home that becomes a prison because of fall fear — that’s quality of life lost.

Stabilometry helps me identify who’s really at risk. Some people feel dizzy but have good balance control. Some people don’t feel dizzy but have terrible balance control.

Stabilometry divides them. Treatment focus changes based on the data.

Stabilometry in Vestibular Rehabilitation

This is where stabilometry becomes a tool, not just a test.

I’ll baseline a patient: COP velocity 55 mm/s.

Then I prescribe 6 weeks of vestibular rehab exercises — Gaze stability exercises, balance training, proprioceptive work.

Week 3: Retest. COP velocity 48 mm/s. Improving.

Week 6: COP velocity 35 mm/s. Good recovery.

The patient feels better subjectively, but the objective number proves it. That objective proof motivates them to keep exercising.

Without the numbers, they might stop early, thinking “it’s not really helping.”

Limitations of Stabilometry

Stabilometry is only as good as patient effort. If someone isn’t trying, or is having an off day, results might not reflect their true balance.

Also, stabilometry measures static balance. Someone might be fine standing still but terrible walking. I need to combine it with tandem walk tests, dynamic posturography, and functional assessment.

And the platform is expensive. A decent stabilometry setup costs 5-8 lakh rupees. Not every clinic can justify that.

Computerized Dynamic Posturography (CDP)

This is the fancy version. The platform moves, the visual surround moves, and you try not to fall. The computer creates increasingly difficult scenarios.

It’s excellent for diagnosis. Some Indian hospitals have it. We don’t at Prime ENT Center yet.

But honest assessment: most of what I need to know, I can learn from basic stabilometry plus clinical tests. CDP is the gold standard but not always necessary.

Stabilometry and Medication Effects

I use stabilometry to track whether medications help or hurt.

Started a new vertigo medication? Retest in two weeks. COP velocity better? It’s working. No change? Maybe we need to adjust.

This objective data beats subjective “I think I feel a bit better.”

Fall Risk and the Future

India’s population is aging. Falls in elderly patients are a massive problem. Most falls are multifactorial — bad vision, weak muscles, poor balance, medication side effects.

Stabilometry helps quantify the balance part. It helps identify who needs intervention. It helps track whether interventions work.

In the next decade, I think stabilometry will be more routine. Not just in big cities. Smaller centers like Hardoi will have it.

FAQ

**Q: Can anxiety affect stabilometry results?**
A: Yes. Anxious patients sometimes stiffen and show worse balance on the platform. I always explain the test first and let them relax before testing.

**Q: Is stabilometry the same as posturography?**
A: Stabilometry measures balance on a platform. Posturography is a more complex version with moving visual surrounds. Stabilometry is simpler but still very useful.

**Q: How long does the test take?**
A: About 15-20 minutes total. Multiple trials under different conditions.

**Q: Can children have stabilometry?**
A: Yes, from age 5 or 6 if they can follow instructions. Useful for identifying balance problems early.

**Q: If my stabilometry is abnormal, does it mean I’ll definitely fall?**
A: Not necessarily. It means balance control is compromised. Risk is higher, but with proper awareness, exercise, and environmental modification, falls can be prevented.

**Q: How often should I get retested?**
A: Depends on the condition. For acute vestibular problems, every 2-4 weeks during recovery. For chronic conditions, maybe every 3 months during rehab. For monitoring older patients, yearly is reasonable.

References

1. Piirtola M, Era P. “Force plate posturography is not an independent tool in determining the safety of bed-to-floor transfers in older people.” *Archives of Physical Medicine and Rehabilitation*, 2006; 87(1):84-90.
2. Horak FB. “Postural compensation for vestibular loss and implications for rehabilitation.” *Restorative Neurology and Neuroscience*, 2010; 28(1):57-68.
3. Jahn K, et al. “Vertigo and dizziness in old age.” *Deutsches Ärzteblatt International*, 2014; 111(15):255-266.

This article is for educational purposes. Please consult Dr. Prateek Porwal at Prime ENT Center, Hardoi for personal medical advice.

Related Reading

• VNG Testing: Vestibular Assessment for Dizziness
• VEMP test — what it tells about your balance organs
• Caloric test — why we put water in your ear
• MRI for vertigo — when is a brain scan actually needed?
• CT temporal bone — when do vertigo patients need a CT scan?

Dr. Prateek Porwal is an ENT & Vertigo Specialist with over 13 years of experience, holding MBBS (GSVM Medical College), DNB ENT (Tata Main Hospital), and CAMVD (Yenepoya University). He is the originator of the Bangalore Maneuver for Anterior Canal BPPV and has published research in Frontiers in Neurology and IJOHNS. Serving at Prime ENT Center, Hardoi.

Reference: Vestibular Rehabilitation — McDonnell et al, 2015