SI Injections Don’t Fix Instability — They Mask It (Here’s the Fix)

If you’re here because your horse is bunny hopping, won’t hold a canter, swaps leads, can’t sit, feels like the hind end is disconnected, drags toes, is stiff one direction, refuses one lead, can’t back up, stops crooked, backs crooked, can’t do straight lines, or you’re Googling “SI injects” because someone suggested injections… you’re in the right place.

Those aren’t “bad behavior.” They’re common compensation patterns when the pelvis/SI can’t manage force. And in biomechanics, nothing lives in isolation: hock, stifle, back, pelvis, SI, and the soft tissue chain are one system. Treat one piece like it’s separate, and you get the modern cycle: manage symptoms, miss the driver.

The simple truth: SI injections manage symptoms. They don’t create stability.

SI injections are popular because they can reduce pain and inflammation quickly. What’s in the syringe typically falls into a few buckets:

• Corticosteroids (examples include methylprednisolone acetate, triamcinolone acetonide, betamethasone): powerful anti-inflammatories that reduce pain signaling.

• Hyaluronic acid (HA): a lubricant-like substance intended to support joint fluid mechanics.

• Polyacrylamide hydrogels (examples include Arthramid, Noltrex): synthetic gels used to support joint structure without being a steroid.

Here’s the part horse owners deserve to hear plainly: none of those ingredients teach the horse to stabilize the pelvis under load. If the horse goes back to the same movement strategy, the same tissues keep getting stressed.

What owners are seeing (and why Google is sending you here)

When the SI region is unstable or overloaded, horses don’t politely say “my SI hurts.” They change movement. That’s why the search terms are so consistent:

• Swaps leads / refuses one lead / won’t hold canter: the horse avoids loading one side of the pelvis correctly.

• Bunny hopping / can’t sit / feels disconnected behind: the system chooses a strategy that reduces demand on painful or unstable tissues.

• Drifting, cross-firing, stops crooked, backs crooked: asymmetrical pelvic control and protective bracing.

• Toe dragging / stiff one direction: altered neuromuscular control and reduced swing-through.

These signs can overlap with other issues, but when they cluster together, the SI/pelvis is a very common driver.

Why Functional Taping exists: 2-way “kinesiology tape” cannot support joints

Let’s make this uncomfortably clear, because it’s the exact argument professionals use to dismiss taping:

Traditional 2-way elastic kinesiology tape is not a reliable joint stabilization tool.

The research people cite to say “taping doesn’t work” is usually research on 2-way kinesiology tape being used for support/stabilization. Those studies often show minimal or inconsistent change in joint mechanics, pain, or function—especially when you try to use 2-way tape like a brace.

That isn’t an attack on science. It’s the scientific reason Functional Taping was built.

If the goal is support/stability, 2-way tape is the wrong tool. Reproducibility problems are real. Getting the same result every time is difficult because the material isn’t designed to contribute meaningful mechanical force for stabilization.

Biomechanical (4-way) taping is a different modality with different physics

Biomechanical taping (4-way stretch) is not “kinesiology tape with a new name.” It operates on a different mechanism.

Where 2-way tape is highly elastic and commonly discussed for skin/neurosensory effects, 4-way biomechanical tape is designed to mechanically manage force.

Think of it like a spring system:

• Applied with the joint/tissue in a shortened position

• As the limb moves into the overloaded range, the tape stretches and stores energy

• That stored energy contributes recoil and decelerates the motion that overloads the joint/ligaments

What the biomechanics research supports (and why it matters clinically)

Across biomechanics-focused studies, three themes show up consistently.

1. Mechanical off-loading / force contribution

• Biomechanical tape can contribute meaningful resistance earlier in the stretch cycle and share load with internal tissues.

2. Improved postural stability and limb loading

• Stability is not just range of motion. It’s the nervous system knowing where the joint is in space and being willing to load it.

3. Pain reduction and better function (especially under fatigue)

• When muscles fatigue, instability and micro-trauma increase. Biomechanical taping can reduce pain and improve movement stability without rigidly restricting motion.

The fix (the part most horses never get): stabilize → let tissue heal → condition

Here’s the logic that actually changes outcomes:

1. Instability creates repeated micro-trauma

2. Repeated micro-trauma prevents tissues from settling and repairing

3. Stabilize the system under load so the same tissues stop getting re-irritated

4. Then condition progressively so the horse can keep the improvement

This is why so many horses end up in the “SI injects” loop: symptoms are quieter for a while, but the underlying load problem is unchanged.

Why lifestyle and soft tissue length matter (this is where the real rehab lives)

If you want the SI to stop being the victim, you have to change what’s pulling on the pelvis all day.

For many horses, the driver isn’t a single “bad SI joint.” It’s a predictable pattern: muscles that attach to the pelvis and spine get short, braced, and over-recruited—often from modern management.

Lifestyle check (non-negotiable if you want a real fix)

• Turnout daily (movement is medicine)

• Feed from the ground (not raised feeders)

• Reduce chronic bracing patterns created by confinement, stress, and repetitive training without adequate release

The soft tissue chain that commonly needs to get long and loose

This is where the weird symptoms start making sense. When tissues like the quadratus lumborum (QL) and psoas are short/overactive, you can see cross-firing, drifting, lead issues, crookedness, and refusal to load.

And it’s not just “muscles.” Fascia matters. If you don’t address the fascial lines, you can calm pain temporarily and still fail to change the movement strategy.

Practical takeaway: you’re not just stabilizing a joint. You’re changing the entire system’s ability to move without bracing.

For horse owners: what to do next (simple, practical, and effective)

If you want a real plan—not a cycle—start here:

1. Stabilize the SI biomechanically (tape in the correct position for the correct goal)

2. Use targeted releases to keep pelvic attachments long and loose (common starting points: back relax, hamstring relax, and related fascia work)

3. Add core and hind-end conditioning once movement is cleaner

4. Reassess weekly and progress the plan for at least 12 weeks

If you want the fastest, simplest path, this is exactly why the SI Signature Bundle exists: it removes the “did I buy the right stuff?” stress and gives you the protocol + tools together.

For healthcare professionals: the question is simple

If you cite 2-way kinesiology tape research to dismiss taping for stabilization, you’re citing the wrong modality for the goal.

Biomechanical taping research supports joint support, stabilization, improved loading, and pain reduction.

So the clinical question isn’t “does taping work?”

It’s: why aren’t we using a load-management tool that helps tissues stop getting re-injured while we rehab and condition?

Research referenced (for readers who want receipts)

Biomechanical / 4-way taping

• ClinicalTrials.gov trial comparing no tape, sham, kinesiology tape, and biomechanical tape (NCT04090541):  https://clinicaltrials.gov/study/NCT04090541 

• Dynamic Tape research summary (balance/coordination/loading in chronic ankle instability):  https://dynamictape.com/further-research-shows-that-dynamic-tape-application-improves-balance-co-ordination-and-limb-loading-in-subjects-with-chronic-ankle-instability/ 

• Randomized clinical study (PMC):  https://pmc.ncbi.nlm.nih.gov/articles/PMC10629267/ 

Research often used against 2-way kinesiology tape for joint support

• PubMed:  https://pubmed.ncbi.nlm.nih.gov/33081510/ 

• JCPSP RCT knee osteoarthritis:  https://www.jcpsp.pk/article-detail/pis-kinesio-taping-effective-for-knee-osteoarthritis-randomised-controlled-doubleblind-studyorp 

• BMJ news coverage questioning KT tape effectiveness:  https://bmjgroup.com/doubt-cast-on-effectiveness-of-widely-used-kt-tape-for-joint-muscle-pain-mobility/