"Back in Line" with Dr. Mosier: Why Do Chiropractors Check Leg Length?

(A Simple Brain-and-Train Explanation)

Hey folks!

Have you ever noticed that when you’re being adjusted—or when you’re watching someone else get adjusted—their leg length changes really fast?

And maybe you’ve wondered… “Is my leg actually shorter?” “What are they really checking?”

Great questions. Let me share a little neurology, and I promise—we’ll keep it simple and fun.

Let’s Talk About the Brain (Using a Train)

When your spine is misaligned (subluxated), your body doesn’t stay quiet about it. In fact, four key structures immediately start sending warning signals up to your brain:

1. Muscles – tightening or stretching abnormally

2. Facet joints – the joints where your spinal bones meet

3. Discs – the cushions between the bones

4. Golgi tendon organs – sensors that protect your tendons from overstretching

All of these signals hop on a “train” and head straight to the brain.

First Stop: The Cerebellum

That train pulls into the cerebellum, the lower part of your brain responsible for:

• Balance

• Coordination

• Proprioception (your body’s sense of position in space)

The cerebellum says, “Hey—something isn’t right in the spine!” Whether it’s your neck, mid-back, or low back, the message is loud and clear.

Next Stop: The Thalamus → Cortex

From there, the signal moves to the thalamus, which acts like a relay station, and then up to the cortex—the thinking, decision-making part of the brain.

Your cortex knows what should be happening:

• Proper spinal curves

• Equal movement

• Smooth, balanced motion

But when that’s not happening, the brain decides it needs to compensate.

The Train Heads Back Down the Spine

Now the train heads back down the spinal cord, telling the body to:

• Tighten certain muscles

• Shift posture

• Protect the problem area

This is where things get interesting…

Those postural changes often show up as uneven leg length.

Not because one bone is shorter, but because muscles and posture are being neurologically altered.

That’s why when we check leg length, it gives us real-time feedback about what your nervous system is doing and where your body needs help.

What the Adjustment Does

When we deliver a chiropractic adjustment, something powerful happens:

The abnormal signal to the brain is turned off. The destructive loop of muscle tightening is interrupted. The nervous system can reset and recalibrate.

That’s why leg lengths often balance out immediately after an adjustment—it’s a neurological change, not a bone change.

Why We Use Multiple Assessments

In our office, leg length checks are just one piece of the puzzle. We also use:

• Insight technology scans

  • Thermography

  • Surface EMG

  • Heart rate variability

• X-ray analysis

• Posture analysis

Together, these tools allow us to be corrective-based, not just reactive—helping your body function better, not just feel better.

Why Massage & Exercises Matter Too

When muscles tighten unevenly, it creates asymmetry. That’s why:

• Chiropractic care

• Massage therapy

• Spinal hygiene exercises

…all work best together.

Mobility, stability, and movement keep your nervous system firing on all cylinders.

Final Thought

Your body is incredibly intelligent—it’s always adapting and compensating. Our job is to help remove interference so your nervous system can do what it was designed to do.

I hope this helped you understand why we check leg length and what it actually means.

We love you guys, and we can’t wait to see you soon.

Your friend,

Dr. Mosier