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Helen Thornton Equine Osteopathy & PEMF, Market Rasen (2026)

03/06/2026

Swimming the atlas

30/05/2026

🐴 THE THORACIC INLET DIAPHRAGM

The Junction Between the Head, Neck and Body

Most horse owners have heard of the thoracic sling.

Many have even been told their horse needs to "strengthen the thoracic sling."

But before we jump straight to exercises, there is an important question worth asking:

What sits immediately above it?

The answer is the thoracic inlet diaphragm.

A region that receives surprisingly little attention despite being one of the most important transition zones in the entire horse.

Anatomically, the thoracic inlet sits at the junction between the neck and thorax.

It is formed by the first ribs, manubrium, lower cervical region and the surrounding fascia that envelops blood vessels, nerves, muscles and lymphatic structures as they pass between the head, neck and body.

This is not simply an area where structures happen to pass through.

It is a major communication hub.

The vagosympathetic trunk passes through here.

The recurrent laryngeal nerves travel through this region.

Major blood vessels supplying and draining the head and neck pass through here.

Lymphatic drainage from the head and neck passes through here.

The fascia of the neck blends into the fascia of the thorax here.

And mechanically, this is where forces travelling between the forehand and trunk are constantly being transferred.

Many owners will recognise the horse that:

Feels tight through the base of the neck.

Struggles to truly elevate the withers.

Leans on the forehand.

Finds collection difficult.

Has an inconsistent contact.

Feels restricted through one shoulder.

Lacks quality thoracic sling function despite endless exercises.

Or simply never develops the front-end posture we are aiming for.

The temptation is often to focus entirely on strengthening.

More poles.

More transitions.

More hill work.

More thoracic sling exercises.

And whilst those things absolutely have their place, osteopathy asks a slightly different question.

Can the system actually adapt to the exercise being asked of it?

Because if the fascia around the thoracic inlet has lost adaptability...

If the first ribs are restricted...

If the hyoid apparatus and cervical fascia are transmitting tension downwards...

If the diaphragm cannot move efficiently...

Then the body may not have access to the movement pattern we are trying to strengthen.

One of the reasons the thoracic inlet fascinates me is because it sits directly between two other diaphragms.

Above it lies the hyoid diaphragm.

Below it lies the respiratory diaphragm.

It is literally positioned between breathing, posture, neurology and locomotion.

A bridge between the horse's head and its body.

This is where the osteopathic concept of the five diaphragms becomes so interesting.

Rather than viewing the horse as separate regions, we begin to appreciate a continuous fascial and neurological system extending from the cranial base all the way to the pelvis.

The thoracic inlet is one of the major crossroads along that journey.

And perhaps this is the part worth remembering:

The thoracic sling is not something that exists in isolation.

Nor is it something that can always be trained successfully in isolation.

Because if the hyoid cannot adapt...

If the first ribs cannot adapt...

If the diaphragm cannot adapt...

If the sacrum cannot rock and transmit force efficiently through the body...

Then the thoracic sling is being asked to compensate for a problem that may not actually begin there.

The body functions as a system.

The solutions often need to be approached the same way.

📚 Part 3 of the Five Diaphragms of Osteopathy Series

For horse owners and bodyworkers wanting to understand these connections in greater depth, including assessment, hands-on techniques and practical application, a dedicated course on the Five Diaphragms is coming soon.

To apply / express interest sign up to email updates (link in comments )

Image: Thoracic Inlet Diaphragm study notes © Helen Thornton EDO

29/05/2026

🐴 PART 1: THE CRANIAL BASE & HYOID DIAPHRAGMS

What if the problem isn't where you're looking?

A horse presents:

• Poll sensitive
• Doesn't like contact
• Inconsistent on the reins
• Headshakes
• Struggles with collection
• Holds tension through the underside of the neck
• Feels tight through the shoulders
• Lacks impulsion behind

The temptation is to look at each symptom separately.

The mouth.

The poll.

The neck.

The shoulders.

The hindquarters.

But what if they are all connected?

One of the concepts within osteopathic thinking is that the body functions through a series of integrated "diaphragms" or transitional zones.

Not simply the respiratory diaphragm (the primary muscle of inspiration)...

…but regions where:

fascia

neurology

circulation

pressure systems

posture

movement organisation

and load transfer

all interact.

The first two of these diaphragms are found within the head and throat region:

📍 The Cranial Base Diaphragm

📍 The Hyoid Diaphragm

These regions form a remarkable bridge between the horse's:

skull

tongue

TMJ

poll

cervical fascia

nervous system

and the rest of the body.

The hyoid apparatus itself is a collection of bones suspended between the skull, tongue, mandible and cervical region.

Through structures such as:

the omohyoid

sternohyoid

sternothyrohyoid

styloglossus

hyoglossus

it develops functional relationships with:

the tongue

cranial base

TMJ region

deep cervical fascia

sternum

shoulder region

and the thoracic sling system beneath.

Neurologically, the area interfaces closely with:

the trigeminal nerve (V)

the hypoglossal nerve (XII)

upper cervical structures

the vagus nerve (X)

and the myodural system linking the suboccipital region with the dura mater.

The vagus nerve is particularly interesting because it passes from the cranial base into the neck and thorax, carrying parasympathetic influence to many of the body's organs while travelling through a region rich in fascial, vascular and mechanical relationships.

This is one of the reasons osteopaths often view the cranial base, hyoid apparatus and cervical fascia as part of a wider integrated system rather than isolated anatomical structures.

The cranial base and hyoid are often described as the first two transitional zones within the Five Diaphragms model of osteopathy.

They sit at the junction between the horse's sensory world, postural system and autonomic nervous system.

This is where things become interesting.

Because when the body stops adapting efficiently, the symptoms do not always appear at the source.

A horse may present with:

🔹 Poll restriction

🔹 Difficulty accepting contact

🔹 Asymmetrical rein feel

🔹 Ventral neck tension

🔹 Headshaking

🔹 Altered swallowing

🔹 Changes in posture or balance

🔹 Thoracic sling bracing

🔹 Shortened forelimb stride
..and yet the underlying story may involve far more than the mouth itself.

The body is constantly attempting to preserve:

balance

neurological safety

autonomic regulation

pressure regulation

efficient breathing

and efficient load transfer.

This is one of the reasons I find osteopathy so fascinating.

Rather than asking:

❓ "Which structure is damaged?"

I often find myself asking:

❓ "Which system is no longer adapting efficiently?"

Because horses are incredibly good at compensating.

Until they aren't.

The two study drawings below are part of my own ongoing exploration of these first two diaphragms:

📍 Cranial Base Diaphragm

📍 Hyoid Diaphragm

and some of the fascial, neurological and mechanical relationships that exist within them.

They're certainly not intended as a complete explanation.

But they may start to show why a horse's symptoms do not always originate where they appear.

The horse may be presenting with a mouth problem...

…but carrying it through an entire postural system.

👇 I'd be interested to know:

Had you ever considered that the tongue, hyoid apparatus, cranial base and poll could potentially influence so many seemingly unrelated presentations?

Comment below and let me know.

📧 If you'd like a deeper dive into the Five Diaphragms of Equine Osteopathy, compensation patterns, fascial continuities and osteopathic thinking, sign up to my email updates via my website.

I'll also send a more detailed educational version of this topic to my email subscribers to peruse over with a cup of tea ☕📖 👇👇👇👇👇👇👇
https://www.helenthornton.com/email-updates

📖 Images: My study drawings.
© Helen Thornton EDO Equine Osteopath

28/05/2026

Sold out

See you all tomorrow

The Balanced Horse Workshop – 2-Day Hands-On Course for Horse Owners & Therapists

26/05/2026

🐴 The 5 Diaphragms of Equine Osteopathy

The word diaphragm does not simply mean “breathing muscle.”

The term originates from the Greek meaning:
“to divide” or “partition.”

Osteopathically, diaphragms can be thought of as key transitional zones or “compartments” within the body…

…areas where pressure, tension, movement, circulation, nerve function and fascial continuity all interact.

And when one loses adaptability, the effects rarely stay local.

One restriction can begin influencing:

- movement
- breathing
- thoracic sling function
- pelvic mechanics
- lumbar stability
- circulation
- nervous system tone
- and compensation patterns throughout the horse.

One of the biggest shifts in osteopathic thinking is moving away from seeing the horse as isolated body parts…

…and instead understanding the horse as a connected system of pressure regulation, load transfer, fascia, neurology and compensation.

This is where the concept of the 5 diaphragms becomes so important.

Not simply “breathing diaphragms”…

…but integrated regions that influence:

- movement
- circulation
- pressure regulation
- load transfer
- proprioception
- compensation patterns
- and even the horse’s ability to relax and organise movement efficiently.

When one area loses adaptability, the body rarely compensates locally.

A restriction through one diaphragm may begin influencing:

- rib mobility
- forelimb loading
- hindlimb engagement
- pelvic organisation
- breathing mechanics
- spinal tension
- autonomic nervous system tone
- and overall movement quality.

This is one of the reasons some horses:

- never seem to “hold” treatment
- continue compensating despite strengthening work
- become chronically tight
- struggle with transitions or canter
- brace through the thorax or pelvis
- appear reactive, tense or unable to soften properly
- or keep developing recurring patterns elsewhere in the body.

Because the body is constantly redistributing pressure, force and tension through the entire system.

The 5 diaphragms are often described osteopathically as including areas such as:

- the pelvic diaphragm
- the respiratory diaphragm
- the thoracic inlet
- the tongue/hyoid complex
- and the cranial/tentorial region

but the important thing is not memorising names.

The important thing is understanding that the horse functions as one integrated system.

Not separate compartments.

This way of thinking completely changes how you begin interpreting:

- movement
- posture
- breathing
- asymmetry
- compensation
- “behaviour”
- recurring rehab failure
- and chronic performance issues.

This is a huge area within osteopathic thinking and something I’ll be expanding on much more in future posts, webinars and courses.

If you’d like me to do separate posts explaining each of the 5 diaphragms individually and how they relate to movement, compensation and the nervous system >

Please comment

👇 5 diaphragms

17/05/2026

🐴 𝗦𝗜 𝗝𝗼𝗶𝗻𝘁 𝗠𝗲𝗰𝗵𝗮𝗻𝗶𝗰𝘀 𝗨𝗻𝗱𝗲𝗿 𝗙𝘂𝗻𝗰𝘁𝗶𝗼𝗻𝗮𝗹 𝗗𝗲𝗺𝗮𝗻𝗱 — 𝗧𝗵𝗲 𝗡𝗲𝘂𝗿𝗮𝗹 𝗖𝗼𝗻𝘀𝗲𝗾𝘂𝗲𝗻𝗰𝗲

Most discussions around SI dysfunction focus purely on structure:

• the joint
• the ligaments
• inflammation
• instability
• muscle weakness

But one of the most important parts of SI dysfunction is often the nervous system.

Because the pelvis is not simply a mechanical structure.

It is a sensory structure.

The sacroiliac region is densely supplied with:

• mechanoreceptors
• nociceptors
• ligamentous sensory endings
• dorsal sacral nerve branches
• fascial neural input

This means the brain is constantly receiving information from the pelvis regarding:

➡️ load
➡️ pressure
➡️ movement
➡️ stability
➡️ limb position

And when pelvic mechanics alter…

the signalling alters too.

𝗧𝗵𝗶𝘀 𝗶𝘀 𝘄𝗵𝘆 𝗦𝗜 𝗱𝘆𝘀𝗳𝘂𝗻𝗰𝘁𝗶𝗼𝗻 𝗶𝘀 𝗻𝗼𝘁 𝗷𝘂𝘀𝘁 “𝗽𝗮𝗶𝗻.”

It becomes a problem of altered motor control.

The horse begins changing movement strategies to protect itself under functional demand.

And this is where owners often start noticing things such as:

• disuniting behind
• bunny hopping in canter
• rushing transitions
• difficulty striking off
• scooting sideways
• reduced impulsion
• crookedness
• toe dragging
• reluctance to collect
• asymmetrical muscle development

Not because the horse is simply weak.

But because the nervous system no longer fully trusts force transfer through the pelvis.

𝗠𝗮𝗻𝘆 𝗰𝗼𝗺𝗺𝗼𝗻 𝗵𝗼𝗿𝘀𝗲 𝗯𝗲𝗵𝗮𝘃𝗶𝗼𝘂𝗿𝘀 𝗮𝗻𝗱 𝗵𝗶𝗻𝗱 𝗵𝗼𝗼𝗳 𝗶𝘀𝘀𝘂𝗲𝘀 𝗮𝗿𝗲 𝗿𝗲𝗹𝗮𝘁𝗲𝗱 𝘁𝗼 𝗮 𝗵𝗼𝗿𝘀𝗲’𝘀 𝘀𝗮𝗰𝗿𝗼𝗶𝗹𝗶𝗮𝗰 𝗷𝗼𝗶𝗻𝘁𝘀.

When you truly have a picture of SI anatomy and force transfer in your mind, you begin making very different decisions in your work with horses.

Because suddenly:
• the canter issue makes more sense
• the hind hoof imbalance makes more sense
• the repeated suspensory strain makes more sense
• the crookedness makes more sense
• the compensation patterns make more sense

And you realise just how many tools you already have available to help the horse become more comfortable and mechanically efficient once the pelvis is factored into the picture.

𝗧𝗵𝗲 𝗡𝗲𝗿𝘃𝗼𝘂𝘀 𝗦𝘆𝘀𝘁𝗲𝗺 𝗔𝗹𝘄𝗮𝘆𝘀 𝗖𝗵𝗼𝗼𝘀𝗲𝘀 𝗣𝗿𝗼𝘁𝗲𝗰𝘁𝗶𝗼𝗻 𝗢𝘃𝗲𝗿 𝗣𝗲𝗿𝗳𝗼𝗿𝗺𝗮𝗻𝗰𝗲

During moments of high functional demand:

• canter transitions
• landing forces
• tight turns
• hill work
• collection
• jumping

…the pelvis must rapidly stabilise while simultaneously transferring huge forces into the spine.

This requires precise timing from:

• multifidi
• gluteals
• hamstrings
• thoracolumbar fascia
• pelvic stabilisers

If pelvic mechanics become asymmetrical, afferent input changes.

The brain receives altered information regarding stability.

And motor output adapts accordingly.

𝗧𝗵𝗲 𝗱𝗲𝗲𝗽 𝘀𝘁𝗮𝗯𝗶𝗹𝗶𝘀𝗲𝗿𝘀 𝗼𝗳𝘁𝗲𝗻 “𝗴𝗼 𝗾𝘂𝗶𝗲𝘁.”

The larger superficial muscles begin bracing instead.

This is why many horses with SI dysfunction develop:

• hypertonic lumbar regions
• dominant hamstring recruitment
• reduced gluteal engagement
• asymmetrical loading patterns
• “board-like” backs

The body is trying to create stability somewhere.

𝗔𝗻𝗱 𝘁𝗵𝗶𝘀 𝗶𝘀 𝗸𝗲𝘆:

You cannot fully rehabilitate altered motor control by strengthening alone if the nervous system still perceives instability.

Because the horse will continue defaulting back to protective movement strategies.

𝗧𝗵𝗶𝘀 𝗶𝘀 𝘄𝗵𝘆 𝘀𝗼𝗺𝗲 𝗵𝗼𝗿𝘀𝗲𝘀:

• improve temporarily
• then relapse
• keep developing overload elsewhere
• repeatedly strain suspensories
• continue struggling in canter despite “strength work”

The system never fully reorganised efficient force transfer.

From an osteopathic perspective, this is why assessment must include:

• pelvic mechanics
• sacral motion
• lumbar adaptation
• fascial continuity
• hoof balance
• diaphragmatic influence
• neurological guarding strategies

Because SI dysfunction is rarely isolated.

And the horse is often compensating long before overt pathology appears on imaging.

𝗧𝗵𝗲 𝗦𝗜 𝗷𝗼𝗶𝗻𝘁 𝗶𝘀 𝗻𝗼𝘁 𝗷𝘂𝘀𝘁 𝗮 “𝗷𝗼𝗶𝗻𝘁 𝗽𝗿𝗼𝗯𝗹𝗲𝗺.”

It is a force-transfer and nervous system problem.

🗓️ 3 days to go until:

“The Pelvic System: Understanding SI Joint Dysfunction Beyond Strengthening”

Where we’ll be exploring:
✔️ pelvic mechanics
✔️ force closure
✔️ neurological inhibition
✔️ compensation patterns
✔️ why horses disunite in canter
✔️ why rehab sometimes fails
✔️ the whole-horse approach to SI dysfunction

[BOOKING LINK In comments]

Image: Anna Lloyd

16/05/2026

🐴 What if the area displaying pain… isn't actually the area causing the problem?

One of the biggest shifts in my work over the years has been moving away from chasing symptoms and instead learning to map the entire compensation pattern of the horse.

Because horses are exceptionally good at adapting.

In fact, many of the painful areas we find are often the body's attempt to protect something else.

The sore lumbar spine.
The tight restricted shoulders.
The reactive SI region.
The short stride.
The "weak hindlimb."
The horse that constantly feels tight again 2 weeks later.

These may not be the beginning of the story at all.

This is where my approach differs significantly from many conventional models.

This is a framework that's been taught in equine osteopathic training for years and yet it's still not the default lens most horses are assessed through.

Understanding and mapping the whole horse across multiple systems simultaneously.
■ Myofascial
■ Parietal / articular
■ Visceral
■ Cranial-sacral
■ Neurological / autonomic
■ Pressure and diaphragmatic systems
■ Load transfer and compensation patterns

Because the horse does not compensate through one system alone.

A hoof issue may alter pelvic loading.
A diaphragm restriction may alter rib mechanics and autonomic tone.
A pelvic torsion may reorganise the thoracic sling.
A cranial base restriction may influence global muscular tone and postural strategy.

‼️Everything is connected.

And this is why I became less interested in simply asking:
"Where does it hurt?"

And far more interested in asking:
"Why is the body protecting this area in the first place?"

‼️This is also why two horses with identical imaging findings can present completely differently.‼️

One adapts.
Another loses the ability to organise load and pressure through the system.

The result?

The body creates compensation after compensation after compensation… until eventually the secondary compensations become louder than the original problem itself.

This is why I find myself in more and more conversations with owners and therapists who feel like something is being missed- horses that aren't failing rehab, but are simply being viewed through too small a lens.

The horse is not a collection of isolated body parts.

It is one integrated neuro-mechanical system constantly adapting to load, pressure, posture, movement, environment and survival.

And when you start viewing the horse that way…

suddenly the compensation patterns begin to make sense.

14/05/2026

🐴 𝗕𝘆 𝗽𝗼𝗽𝘂𝗹𝗮𝗿 𝗱𝗲𝗺𝗮𝗻𝗱!
The SI Joint Webinar is back for a second live viewing...
After the response to the first event, so many owners and therapists asked for another chance to attend live and ask questions.
So here it is 👇

🐴𝗦𝗜 𝗝𝗼𝗶𝗻𝘁 𝗗𝘆𝘀𝗳𝘂𝗻𝗰𝘁𝗶𝗼𝗻 𝗶𝗻 𝗛𝗼𝗿𝘀𝗲𝘀: 𝗧𝗵𝗲 𝗶𝘀𝘀𝘂𝗲 𝗮𝗹𝗺𝗼𝘀𝘁 𝗲𝘃𝗲𝗿𝘆 𝗼𝘄𝗻𝗲𝗿 𝗵𝗮𝘀 𝗵𝗲𝗮𝗿𝗱 𝗼𝗳… 𝗯𝘂𝘁 𝗳𝗲𝘄 𝘁𝗿𝘂𝗹𝘆 𝘂𝗻𝗱𝗲𝗿𝘀𝘁𝗮𝗻𝗱.

𝙏𝙝𝙚 𝙨𝙖𝙘𝙧𝙤𝙞𝙡𝙞𝙖𝙘 𝙟𝙤𝙞𝙣𝙩 (𝙎𝙄𝙅) 𝙞𝙨 𝙣𝙤𝙩 𝙟𝙪𝙨𝙩 “𝙖𝙣𝙤𝙩𝙝𝙚𝙧 𝙟𝙤𝙞𝙣𝙩.”
𝙄𝙩 𝙞𝙨 𝙩𝙝𝙚 𝙡𝙤𝙖𝙙-𝙩𝙧𝙖𝙣𝙨𝙛𝙚𝙧 𝙝𝙪𝙗 𝙗𝙚𝙩𝙬𝙚𝙚𝙣 𝙩𝙝𝙚 𝙝𝙞𝙣𝙙𝙡𝙞𝙢𝙗𝙨 𝙖𝙣𝙙 𝙩𝙝𝙚 𝙨𝙥𝙞𝙣𝙚.

When it is functioning well, the horse feels:

✔ Even
✔ Powerful
✔ Willing
✔ Straight

When it is not coping, the whole “engine room” looks weaker, crooked, or inconsistent.

𝘈𝘯𝘥 𝘩𝘦𝘳𝘦’𝘴 𝘵𝘩𝘦 𝘬𝘦𝘺:

𝙎𝙄 𝙙𝙮𝙨𝙛𝙪𝙣𝙘𝙩𝙞𝙤𝙣 𝙞𝙨 𝙧𝙖𝙧𝙚𝙡𝙮 𝙟𝙪𝙨𝙩 𝙖𝙗𝙤𝙪𝙩 𝙩𝙝𝙚 𝙟𝙤𝙞𝙣𝙩 𝙞𝙩𝙨𝙚𝙡𝙛.

🔎 𝗪𝗵𝘆 𝗦𝗜 𝗣𝗿𝗼𝗯𝗹𝗲𝗺𝘀 𝗔𝗿𝗲 𝗦𝗼 𝗖𝗼𝗺𝗺𝗼𝗻:

The SI joint has a unique job: It must transfer massive propulsion forces from the hindlimbs into the spine while barely moving.
Read that one again 😳

𝘐𝘵 𝘳𝘦𝘭𝘪𝘦𝘴 𝘰𝘯 𝘵𝘸𝘰 𝘭𝘢𝘺𝘦𝘳𝘴 𝘰𝘧 𝘴𝘵𝘢𝘣𝘪𝘭𝘪𝘵𝘺

1️⃣ 𝗙𝗼𝗿𝗺 𝗖𝗹𝗼𝘀𝘂𝗿𝗲
The anatomical shape and wedge-like congruency of the joint surfaces create inherent stability.

2️⃣ 𝗙𝗼𝗿𝗰𝗲 𝗖𝗹𝗼𝘀𝘂𝗿𝗲
Dynamic muscular and fascial support adds compression and control:

● Gluteals
● Hamstrings
● Multifidi
●Thoracolumbar fascia
● Pelvic floor

𝗟𝗼𝗻𝗴𝗶𝘀𝘀𝗶𝗺𝘂𝘀 𝗱𝗼𝗿𝘀𝗶 also plays a role in force closure, though it often becomes "𝘵𝘪𝘨𝘩𝘵" (hypertonic) to compensate when the deeper Multifidi (the stabilizers) are weak. This is why a horse with SI pain often has a very hard, "𝘣𝘰𝘢𝘳𝘥-𝘭𝘪𝘬𝘦" back.

A horse can have perfectly normal “𝘧𝘰𝘳𝘮 𝘤𝘭𝘰𝘴𝘶𝘳𝘦”
…but if 𝘧𝘰𝘳𝘤𝘦 𝘤𝘭𝘰𝘴𝘶𝘳𝘦 drops (fatigue, poor conditioning, pain, compensation, saddle issues, overload), the SI region becomes the weak link.

The engine room loses power and therefore transmitting forces!

Cue...Suspensory inflammation, strain to hocks, foot balance issues, loading issues and propulsion issues.

This is why so many horses present with SI patterns without having obvious trauma. For me it's great to get these areas comfortable and compensations dealt with, before things like suspensory inflammation begin.

⚖️ 𝗦𝗺𝗮𝗹𝗹 𝗣𝗲𝗹𝘃𝗶𝗰 𝗦𝗵𝗶𝗳𝘁𝘀 > 𝗕𝗶𝗴 𝗣𝗲𝗿𝗳𝗼𝗿𝗺𝗮𝗻𝗰𝗲 𝗖𝗵𝗮𝗻𝗴𝗲𝘀

𝘍𝘳𝘰𝘮 𝘢𝘯 𝘰𝘴𝘵𝘦𝘰𝘱𝘢𝘵𝘩𝘪𝘤 𝘱𝘦𝘳𝘴𝘱𝘦𝘤𝘵𝘪𝘷𝘦, 𝘐 𝘢𝘴𝘴𝘦𝘴𝘴:

● Ilium ventral or dorsal rotation
● IIlium inflare / outflare
● Upslides from trauma (𝘳𝘦𝘧𝘦𝘳𝘴 𝘵𝘰 𝘵𝘩𝘦 𝘦𝘯𝘵𝘪𝘳𝘦 𝘪𝘭𝘪𝘶𝘮 𝘣𝘦𝘪𝘯𝘨 𝘴𝘩𝘶𝘯𝘵𝘦𝘥 𝘥𝘰𝘳𝘴𝘢𝘭𝘭𝘺 𝘢𝘯𝘥 𝘰𝘧𝘵𝘦𝘯 𝘤𝘢𝘶𝘥𝘢𝘭𝘭𝘺 - 𝘶𝘱 𝘢𝘯𝘥 𝘣𝘢𝘤𝘬)
● Sacral motion around multiple axes

𝘛𝘩𝘦𝘴𝘦 𝘴𝘶𝘣𝘵𝘭𝘦 𝘱𝘦𝘭𝘷𝘪𝘤 𝘢𝘥𝘢𝘱𝘵𝘢𝘵𝘪𝘰𝘯𝘴 𝘤𝘢𝘯 𝘤𝘳𝘦𝘢𝘵𝘦:

● Apparent “functional leg-length difference”
● Uneven tuber sacrale height
● Uneven tuber coxaes
● Altered hoof landing
● One-sided difficulty in canter

𝘛𝘩𝘦𝘺 𝘢𝘳𝘦 𝘧𝘶𝘯𝘤𝘵𝘪𝘰𝘯𝘢𝘭 𝘮𝘰𝘵𝘪𝘰𝘯 𝘳𝘦𝘴𝘵𝘳𝘪𝘤𝘵𝘪𝘰𝘯𝘴 𝘢𝘯𝘥 𝘢𝘥𝘢𝘱𝘵𝘢𝘵𝘪𝘰𝘯𝘴.

And because the SI joint is deep and cannot be properly X-rayed, these motion patterns cannot be seen on imaging.

They must be palpated and assessed via Direct Motion Testing.

𝗧𝗵𝗲 "𝗡𝗲𝘂𝗿𝗮𝗹" 𝗙𝗮𝗰𝘁𝗼𝗿:

Force closure requires the nervous system to fire those muscles just before the hoof hits the ground. If a horse is in pain elsewhere (like the hocks or feet), the brain often delays this firing, meaning the force closure fails even if the muscles look "big."

𝗖𝗹𝗶𝗻𝗶𝗰𝗮𝗹 𝗜𝗺𝗽𝗹𝗶𝗰𝗮𝘁𝗶𝗼𝗻: 𝗧𝗵𝗲 "𝗩𝗶𝗰𝗶𝗼𝘂𝘀 𝗖𝘆𝗰𝗹𝗲"

𝘊𝘰𝘯𝘥𝘪𝘵𝘪𝘰𝘯𝘪𝘯𝘨 𝘪𝘴 𝘤𝘳𝘶𝘤𝘪𝘢𝘭. 𝘞𝘩𝘦𝘯 𝘢 𝘩𝘰𝘳𝘴𝘦 𝘩𝘢𝘴 "𝘱𝘰𝘰𝘳 𝘤𝘰𝘯𝘥𝘪𝘵𝘪𝘰𝘯𝘪𝘯𝘨," 𝘵𝘩𝘦𝘺 𝘭𝘰𝘴𝘦 𝘵𝘩𝘦 𝘮𝘶𝘴𝘤𝘶𝘭𝘢𝘳 "𝘩𝘶𝘨" 𝘢𝘳𝘰𝘶𝘯𝘥 𝘵𝘩𝘦 𝘫𝘰𝘪𝘯𝘵.

This leads to:
▪︎ Micro-instability in the joint.
▪︎ Inflammation of the ventral sacroiliac ligaments.
▪︎ Spasms in the longissimus dorsi (back muscles) as they try to compensate for the pelvic instability.

The SI joint is not a high-motion joint such as the fetlock, but rather a stress-transfer mechanism.

The SIJ relies on "active" stability from the surrounding soft tissue.

If the muscles and fascia aren't providing that necessary compression, the horse will subconsciously develop compensatory movement patterns to avoid the discomfort of a "shearing" sensation in the pelvis.

𝙃𝙚𝙧𝙚 𝙖𝙧𝙚 𝙩𝙝𝙚 𝙨𝙥𝙚𝙘𝙞𝙛𝙞𝙘 𝙨𝙞𝙜𝙣𝙨 𝙩𝙝𝙖𝙩 𝙩𝙝𝙚 𝙚𝙣𝙜𝙞𝙣𝙚 𝙧𝙤𝙤𝙢 𝙞𝙨 𝙛𝙖𝙞𝙡𝙞𝙣𝙜 𝙙𝙪𝙚 𝙩𝙤 𝙥𝙤𝙤𝙧 𝙛𝙤𝙧𝙘𝙚 𝙘𝙡𝙤𝙨𝙪𝙧𝙚:

1️⃣ 𝗧𝗵𝗲 "𝗕𝘂𝗻𝗻𝘆 𝗛𝗼𝗽" (𝗖𝗮𝗻𝘁𝗲𝗿 𝗗𝘆𝘀𝗳𝘂𝗻𝗰𝘁𝗶𝗼𝗻)

This is the most classic sign of SI instability.

𝘛𝘩𝘦 𝘴𝘪𝘨𝘯: Both hind limbs move more simultaneously in canter.

𝘞𝘩𝘺?
Unilateral pelvic stability is insufficient, so the horse reduces shear by moving both legs together.

2️⃣ "𝗗𝗶𝘀𝘂𝗻𝗶𝘁𝗶𝗻𝗴" 𝗼𝗿 𝗖𝗿𝗼𝘀𝘀-𝗖𝗮𝗻𝘁𝗲𝗿𝗶𝗻𝗴

The horse may start on the correct lead but "swap" behind after a few strides, especially in corners.

𝘛𝘩𝘦 𝘚𝘪𝘨𝘯: Leading with the left leg in front but the right leg behind.

𝘞𝘩𝘺?
As the horse turns, the torque on the pelvis increases. If the fascial slings (like the thoracolumbar fascia) aren't tensioning correctly, the horse cannot maintain the diagonal coordination and swaps to a "stiffer" gait to find stability.

3️⃣ 𝗗𝘂𝗰𝗸𝗶𝗻𝗴" 𝗢𝘂𝘁 𝗼𝗳 𝗧𝗿𝗮𝗻𝘀𝗶𝘁𝗶𝗼𝗻𝘀

Transitions (walk-to-canter or trot-to-halt) require a massive "surge" of force closure to stabilize the pelvis as the centre of gravity shifts.

𝘛𝘩𝘦 𝘚𝘪𝘨𝘯: The horse may toss its head, hollow its back, or "scoot" sideways during a transition.

Why?:
The horse is bracing against the anticipated "jolt" in the SIJ because the stabilizing muscles (multifidi and gluteals) aren't firing fast enough to protect the joint.

4️⃣ 𝗔𝘀𝘆𝗺𝗺𝗲𝘁𝗿𝗶𝗰𝗮𝗹 𝗠𝘂𝘀𝗰𝗹𝗶𝗻𝗴 (“𝗦𝘂𝗻𝗸𝗲𝗻 𝗦𝗜”)
Visible atrophy around the croup.

𝘞𝘩𝘺?
When force closure is chronically absent, the "software" (the nerves) stops telling the "hardware" (the muscles) to work.
🟰Chronic inhibition of multifidi and deep stabilisers.
Superficial muscles compensate and fatigue.

🧠 𝗦𝗜 𝗜𝘀 𝗥𝗮𝗿𝗲𝗹𝘆 “𝗝𝘂𝘀𝘁 𝗦𝗜”

One of the most important principles;
The pelvis and lumbar spine behave as a functional unit.

𝘏𝘪𝘯𝘥𝘭𝘪𝘮𝘣 𝘧𝘰𝘳𝘤𝘦 𝘵𝘳𝘢𝘯𝘴𝘮𝘪𝘵𝘴:
Hip ➡️ SI ➡️ Lumbar spine

Distal overload (hoof imbalance, hock strain, stifle compensation)
often drives pelvic adaptation.

𝗦𝗼, 𝗶𝗳 𝘆𝗼𝘂 𝗼𝗻𝗹𝘆 𝘁𝗿𝗲𝗮𝘁 𝘁𝗵𝗲 𝗦𝗜 𝘄𝗶𝘁𝗵𝗼𝘂𝘁 𝗮𝘀𝘀𝗲𝘀𝘀𝗶𝗻𝗴:

● Lumbar mechanics
● Diaphragm tension
● Thoracolumbar fascia
● Visceral influences
● Hoof Mechanics

𝘠𝘰𝘶 𝘮𝘪𝘴𝘴 𝘵𝘩𝘦 𝘥𝘳𝘪𝘷𝘦𝘳.

𝗦𝘂𝗺𝗺𝗮𝗿𝘆
👀 What Owners Often Notice First:

𝘚𝘐 𝘵𝘦𝘳𝘳𝘢𝘪𝘯 𝘰𝘧𝘵𝘦𝘯 𝘴𝘩𝘰𝘸𝘴 𝘶𝘱 𝘢𝘴:

● Disunited or difficult canter
● One-sided strike-off problems
● “Bunny hopping” behind
● Difficulty sitting or collecting
● Crooked lateral work
● Reduced impulsion
● Bucking on transition
● Reluctance to jump
● Hind limb that feels “short”

Owners usually know something feels off.
They just can’t explain it.

𝗦𝗼, 𝗶𝗳 𝘆𝗼𝘂 𝗵𝗮𝘃𝗲 𝘀𝘂𝘀𝗽𝗲𝗻𝘀𝗼𝗿𝘆 𝗶𝗻𝗳𝗹𝗮𝗺𝗺𝗮𝘁𝗶𝗼𝗻, 𝗦𝗜𝗝 𝗱𝘆𝘀𝗳𝘂𝗻𝗰𝘁𝗶𝗼𝗻, 𝗮𝗺𝗼𝗻𝗴𝘀𝘁 𝘀𝗼𝗺𝗲 𝗼𝗳 𝘁𝗵𝗲 𝗮𝗯𝗼𝘃𝗲 𝘁𝗿𝗮𝗶𝗻𝗶𝗻𝗴 𝗶𝘀𝘀𝘂𝗲𝘀 𝗶𝘁𝘀 𝗽𝗮𝗿𝗮𝗺𝗼𝘂𝗻𝘁 𝘁𝗵𝗮𝘁 𝘁𝗵𝗲 𝗵𝗼𝗿𝘀𝗲 𝗶𝘀 𝗮𝘀𝘀𝗲𝘀𝘀𝗲𝗱 > 𝗧𝗛𝗘 𝗪𝗛𝗢𝗟𝗘 𝗛𝗢𝗥𝗦𝗘.

Because The Pelvis Doesn’t Just “Go Out”

Small pelvic adaptations can create major loading asymmetries.
And because the SI is deep and heavily muscled, it cannot be properly assessed on standard radiographs.

You cannot X-ray movement quality.
You have to palpate it.

𝗛𝗲𝗿𝗲’𝘀 𝗧𝗵𝗲 𝗣𝗮𝗿𝘁 𝗣𝗲𝗼𝗽𝗹𝗲 𝗠𝗶𝘀𝘀

SI dysfunction is rarely isolated.
As I said, the pelvis and lumbar spine function as a unit.
The diaphragm also influences sacral loading via the thoracolumbar fascia.

𝙄𝙣 𝙨𝙝𝙤𝙧𝙩 ↪️ 𝙏𝙝𝙞𝙨 𝙞𝙨 𝙤𝙛𝙩𝙚𝙣 𝙖 𝙨𝙮𝙨𝙩𝙚𝙢𝙨 𝙞𝙨𝙨𝙪𝙚.
𝙉𝙤𝙩 𝙖 𝙨𝙞𝙣𝙜𝙡𝙚 𝙟𝙤𝙞𝙣𝙩 𝙥𝙧𝙤𝙗𝙡𝙚𝙢.

𝘚𝘵𝘦𝘳𝘰𝘪𝘥 𝘐𝘯𝘫𝘦𝘤𝘵𝘪𝘰𝘯𝘴 𝘙𝘦𝘥𝘶𝘤𝘦 𝘐𝘯𝘧𝘭𝘢𝘮𝘮𝘢𝘵𝘪𝘰𝘯.
𝘛𝘩𝘦𝘺 𝘥𝘰 𝘯𝘰𝘵 𝘳𝘦𝘴𝘵𝘰𝘳𝘦:
● Pelvic mechanics
● Force transfer
● Muscular coordination
● Fascial tension balance

Sometimes they are appropriate. But if you don’t address the pattern,the horse often circles back to the same problem.

𝗪𝗵𝗮𝘁 𝗔𝗰𝘁𝘂𝗮𝗹𝗹𝘆 𝗖𝗵𝗮𝗻𝗴𝗲𝘀 𝗢𝘂𝘁𝗰𝗼𝗺𝗲𝘀
● Build strength progressively
● Straight lines before tight circles
● Gentle hills
● Raised poles
● Balanced transitions
● Restore lumbar & diaphragmatic mobility

𝙏𝙝𝙚 𝙎𝙄 𝙟𝙤𝙞𝙣𝙩 𝙞𝙨 𝙣𝙤𝙩 𝙬𝙚𝙖𝙠. 𝙄𝙩 𝙞𝙨 𝙪𝙨𝙪𝙖𝙡𝙡𝙮 𝙤𝙫𝙚𝙧𝙡𝙤𝙖𝙙𝙚𝙙, 𝙪𝙣𝙙𝙚𝙧-𝙨𝙪𝙥𝙥𝙤𝙧𝙩𝙚𝙙, 𝙖𝙣𝙙 𝙤𝙛𝙩𝙚𝙣 𝙘𝙤𝙢𝙥𝙚𝙣𝙨𝙖𝙩𝙞𝙣𝙜 𝙛𝙤𝙧 𝙨𝙤𝙢𝙚𝙩𝙝𝙞𝙣𝙜 𝙚𝙡𝙨𝙚, 𝙟𝙪𝙨𝙩 𝙡𝙞𝙠𝙚 𝙩𝙝𝙤𝙨𝙚 𝙞𝙣𝙛𝙡𝙖𝙢𝙚𝙙 𝙨𝙪𝙨𝙥𝙚𝙣𝙨𝙤𝙧𝙞𝙚𝙨.

…this webinar will make a LOT start to make sense.

🗓️ 6 DAYS TO GO

LINK PINNED IN COMMENTS
Or comment webinar and I'll reply with it
Subscribers get a discount

12/05/2026

🐴 Why does my horse keep disuniting in canter…..?

Or maybe:

▪️ your horse strikes off correctly in front… but not behind
▪️ disunites within a few strides
▪️ switches behind on one rein
▪️ struggles to hold canter balance
▪️ rushes into canter transitions
▪️ feels powerful one direction and impossible the other
▪️ continually gets labelled “weak behind”

Disuniting in canter is incredibly common.

And yet most discussions still revolve around:

👉 more strengthening
👉 more impulsion
👉 more straightness work
👉 more engagement

But what if the horse is not simply “weak”?

What if the body is struggling to organise load transfer through the pelvic system under the demand of canter itself?

Because canter is not symmetrical.

It requires:

▪️ timing
▪️ force transfer
▪️ pelvic coordination
▪️ sacral adaptation
▪️ controlled load acceptance
▪️ and the ability to transfer propulsion diagonally through the body without collapsing into compensation

The pelvis:

Is a functional ring:

▪️ two ilia
▪️ the sacrum
▪️ the p***c symphysis
▪️ and an enormous network of ligaments, fascia and muscular force closure systems

And the sacrum itself is not fixed.

It behaves more like a dynamic wedge that has to continually adapt between the hindlimbs as force transfers through the horse.

Now think about canter.

Every stride asks the horse to:

▪️ load asymmetrically
▪️ stabilise asymmetrically
▪️ push off asymmetrically
▪️ absorb rotational forces through the pelvis and trunk
▪️ and coordinate all of this within fractions of a second

If that system cannot organise efficiently…

the horse often finds another strategy.

And that strategy may look like:

👉 disuniting
👉 switching behind
👉 bunny hopping transitions
👉 drifting quarters
👉 motorbike canter
👉 rushing
👉 flattening
👉 repeatedly falling onto one shoulder

Sometimes the horse is not refusing the work.

Sometimes the horse cannot comfortably transfer force through the system being asked to perform it.

This is also why some horses:

▪️ improve temporarily
▪️ then relapse
▪️ improve one rein but not the other
▪️ or continue struggling despite everyone trying very hard to strengthen them

Because you cannot purely strengthen a system that is failing to organise load, timing and force transfer efficiently.

This is exactly why I keep saying SI joint dysfunction is rarely just about: “a weak hindlimb.”

It is about how the entire body transfers, stabilises and adapts to force under demand.

And canter exposes that system very, very quickly. 🐴

Image: The wonderful Sonja Weber Reitkunst
📸 Sabine Grosser

11/05/2026

Misinformation… or just oversimplification?

Because right now in equine therapy, I’m seeing a lot of:
👉 “this area = that organ”
👉 “this pattern = one cause”
👉 “it’s all fascia”

And whilst it sounds neat…
the anatomy doesn’t actually support it.

Let’s ground this properly 👇

▪️ Stomach > sympathetic input is primarily mid-thoracic (approx T9–T13) via the celiac ganglion
YES UNDER THE RIDER

▪️ Liver > not a single point either
> right side: ~TH6–TH16
> left side: ~TH6–TH11
▪️ Colon / cecum > this involves L1–L4
> but as part of a distributed neurological network, not a single “spot”such as L1
▪️ Reproductive system > sits further caudally
> ovaries: around L1
> uterine tubes: around L2

So no - the body is not working off a simple:
❌ “this 1 vertebra = all organs” rule.

Here’s the part that really matters clinically 👇

When a horse presents with:
▪️ lumbar guarding
▪️ reduced rib excursion
▪️ asymmetry in movement
▪️ changes through the topline
▪️ difficulty loading behind
▪️ recurring SI dysfunction patterns

…you are NOT looking at a single cause.

You are looking at a conversation between systems:

▪️ neurological (segmental input)
▪️ visceral (organ load / irritation)
▪️ mechanical (load transfer + compensation)
▪️ pressure systems (diaphragm + abdominal control)
▪️ pelvic mechanics and sacral organisation

And this is exactly why visceral assessment and treatment forms such a key part of equine osteopathic work.

Because horses with:
▪️ gastric irritation
▪️ hindgut disturbance
▪️ metabolic load

…don’t just show internal signs.

👉 they show measurable changes in tone, movement, pressure regulation, and compensation throughout the body when you assess the WHOLE system properly.

And this is also why understanding the sacrum and SI joint matters so much too.

Not just as a “joint problem”…
but as one of the body’s major foundations for:

▪️ load transfer
▪️ force closure
▪️ propulsion
▪️ pressure adaptation
▪️ nervous system organisation

The sacrum is not sitting there passively.

It is part of the entire conversation between the spine, pelvis, diaphragm, abdominal wall, hindlimbs, and nervous system.

Which is why very often, when I assess a horse osteopathically, I begin by mapping what the pelvis and sacrum are telling me first.

Because compensation patterns there often reveal the bigger picture far faster than chasing symptoms.

The body is not simple.
It’s integrated.
It’s adaptive.
And it will always choose protection over performance when under load.

Good therapy respects that.

👇 If you missed my recent webinar:

“The Pelvic System: Understanding SI Joint Dysfunction Beyond Strengthening”

…it’s being held again on 20th May due to demand.

Because understanding how the SI joint and sacrum ACTUALLY function within the body changes the way you see compensation patterns completely.

(Link is in the comments)......but you're welcome to comment SI WEBINAR & I will give it to you.

If you could ask one question about how the SI joint and visceral systems actually talk to each other, what would it be? Drop it below and I’ll try to answer as many as I can! 👇

Helen Thornton Equine Osteopathy & PEMF

03/06/2026

30/05/2026

29/05/2026

28/05/2026

26/05/2026

17/05/2026

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11/05/2026

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