Why Topline Work Is Not Fixing Your Horse’s Back (Multifidus Explained)

Why Topline Work Does Not Fix Back Instability

Topline work alone does not fix back instability because spinal stability depends on the multifidus, a deep muscle that controls movement between vertebrae. This system relies on neuromuscular coordination, not just strength. A horse can build topline while still lacking segmental control, resulting in ongoing instability and performance issues.

What Is the Multifidus Muscle in Horses

The multifidus is a deep spinal muscle that runs along the vertebral column.

It does not create large visible movement.

Instead, it functions to:

• stabilize individual spinal segments
• control intervertebral motion
• support postural control

Research shows the multifidus spans multiple vertebrae and is specifically designed for segmental stabilization, not gross movement.

Reference
Stubbs NC et al. 2011
https://pmc.ncbi.nlm.nih.gov/articles/PMC5314397/

Think of It This Way

The longissimus creates movement.
The multifidus controls movement.

One is the engine.
The other is the steering system.

You can build a bigger engine.

But without steering, the system is still unstable.

Why Segmental Control Matters More Than Strength

Spinal stability depends on how well each vertebral segment is controlled.

If segmental control is lost:

• movement becomes less precise
• load distribution becomes uneven
• compensations develop

This is why performance issues often persist even when the horse looks stronger.

The Missing Piece: Neuromuscular Control

The multifidus depends on:

• neurologic input
• timing of activation
• coordination with surrounding muscles

This means dysfunction is not just weakness.

It is inhibition and poor coordination.

Research also shows that dysfunction can persist even after pain resolves.

Reference
Haussler KK
https://www.mdpi.com/2076-2615/14/5/698

Why Topline Development Can Be Misleading

Topline muscles like the longissimus dorsi:

• create extension
• produce visible muscle
• drive gross movement

But they do not control segmental stability.

This creates a common issue:

The horse looks stronger, but the system is still unstable.

This mirrors patterns seen in
Why Your Horse Feels Heavy on the Forehand: Thoracic Sling Dysfunction, Shoulder Instability, and Front End Load Distribution

The Most Common Mistake Riders Make

Most riders try to fix back issues by:

• increasing work
• adding more topline exercises
• pushing for more engagement

But if the stabilizing system is not functioning:

More work does not create stability.

It reinforces compensation.

If your horse looks stronger but still feels inconsistent, this is often the missing piece.

Why More Topline Work Does Not Fix Instability

You cannot:

• strengthen a muscle that is not activating correctly
• stabilize a joint that is not controlled
• fix coordination with strength alone

This is the same principle seen in
Why Your Horse Cannot Cross Under: Hindlimb Engagement and Pelvic Stability Explained

Clinical Signs of Poor Spinal Stability

• inconsistent contact
• difficulty with transitions
• lack of straightness
• back soreness
• loss of coordination

Often mistaken for training problems.

How to Actually Improve Back Stability

Restore mobility

• thoracolumbar spine
• pelvis
• lumbosacral junction

Improve neuromuscular control

• timing
• coordination

Then build strength

This aligns with
Why Long and Low Matters: A Biomechanical Perspective on Equine Spinal Function

Final Takeaway

A horse that lacks stability does not need more work.

It needs a system that can control movement.

Until that is addressed, performance problems will keep returning.

If your horse’s movement or coordination has changed, the issue may not be strength.

It may be how the system is functioning.

FAQ

Does topline fix back pain?
No. It improves muscle but not deep stabilizing control.

What stabilizes the spine?
The multifidus controls intervertebral motion.

Why is my horse still unstable after building topline?
Because stability depends on coordination, not size.

Is topline the same as core strength?
No. Core stability comes from deep muscles like the multifidus.

Why does my horse lose balance even when fit?
Because fitness does not equal neuromuscular control.

References

Stubbs NC, Kaiser LJ, Hauptman J, Clayton HM. 2011. Structural and functional characteristics of the thoracolumbar multifidus muscle in horses. Journal of Anatomy.
https://pmc.ncbi.nlm.nih.gov/articles/PMC5314397/

Haussler KK. 2023. Advances in the clinical diagnostics of equine back pain. Animals (MDPI).
https://www.mdpi.com/2076-2615/14/5/698

Stubbs NC, et al. 2022. Electromyographic activity of the multifidus muscle in horses. Frontiers in Veterinary Science.
https://www.frontiersin.org/articles/10.3389/fvets.2022.844776

Clayton HM, Hobbs SJ. 2017. The role of biomechanical analysis of horse and rider in equitation science. Applied Animal Behaviour Science.
https://doi.org/10.1016/j.applanim.2017.02.005