Veterinary Surgery Deep Dive: Equine Soft Tissue — January 2026 Edition

In this episode of the Simini Equine Surgery Podcast, we explore the soft tissue research from the January 2026 issue (Issue 1) of Veterinary Surgery, where two innovative studies focus on making equine upper airway surgery less invasive, mechanically stronger, and more effective over the long term. 

One study introduces a standing, minimally invasive technique for prolonged treatment of guttural pouch disease, while the second evaluates new prosthetic laryngoplasty implant designs aimed at reducing the long-term failure that continues to challenge treatment of recurrent laryngeal neuropathy.

In this episode:

✅ Lepage et al. described a novel technique for endoscopically assisted transcutaneous guttural pouch catheterization (TGPC) using a 20 French balloon catheter placed into the medial guttural pouch compartment of standing horses. Across 15 procedures, the authors achieved a 100% technical success rate without major arterial or nerve injury. The catheter remained in place for 4 to 17 days, allowing repeated lavage and prolonged local treatment of guttural pouch mycosis and empyema while avoiding the morbidity associated with open surgical approaches and general anesthesia. Minor complications were limited to superficial venous bleeding and temporary skin abrasions, with all catheter tracts healing rapidly following removal. The study demonstrates that prolonged standing access to the guttural pouch is both practical and safe, opening new possibilities for managing these anatomically challenging diseases. 

✅ Ysebaert et al. compared three prosthetic laryngoplasty constructs in an ex vivo biomechanical study of equine larynges. Traditional suture fixation was evaluated alongside a suture anchor and a novel tie bolt implant. While the suture anchor achieved equivalent arytenoid abduction using significantly less tension, the tie bolt demonstrated the greatest construct stiffness, the least cyclic elongation, and the highest ultimate failure load. Rather than failing through progressive suture cut-through of the arytenoid cartilage, the tie bolt distributed forces so effectively that failure occurred only after fracture of the cartilage itself. These findings suggest that optimizing implant mechanics may substantially improve long-term stability following prosthetic laryngoplasty for recurrent laryngeal neuropathy. 

Together, these studies illustrate how innovation in equine soft tissue surgery increasingly centers on minimizing surgical morbidity while maximizing mechanical reliability and long-term patient outcomes.

🎓 Journal Articles Discussed

• Lepage et al. — Endoscopically assisted transcutaneous placement of a balloon catheter in the medial guttural pouch compartment of the horse: A surgical approach to local treatment
• Ysebaert et al. — Biomechanical testing of three constructs for prosthetic laryngoplasty in horses demonstrates advantages of differing metallic implants in the arytenoid cartilage

📚 From the January 2026 Issue (Issue 1) of Veterinary Surgery

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Transcript

SPEAKER_00 0:04

Hi, I'm Carl Damiani, and this is the Simene Equine Surgery Podcast, your fast, focused update on what matters most from the latest Equine Surgical Literature. In each episode, we break down key articles from the veterinary journals and translate them into surgical insight you can use today, not someday. This episode covers the soft tissue section from the January 2026 issue of veterinary surgery, focusing on two studies that introduce new approaches to managing challenging upper airway and guttural pouch disorders in horses. First, we'll look at LePage et al., who describe a novel minimally invasive technique for endoscopically assisted transcutaneous placement of a balloon catheter into the medial guttural pouch compartment. The study explores whether this standing procedure can provide prolonged local treatment for guttural pouch mycosis and empema while avoiding the morbidity associated with more invasive surgical approaches. Then we'll review Isabert et al., who compare three prosthetic laryngeoplasty constructs in an ex vivo biomechanical study. By evaluating traditional suture fixation alongside a suture anchor and a novel tie bolt implant, the authors investigate how implant design influences arritinoid abduction, construct stiffness, and long-term mechanical stability, key factors in improving outcomes for horses with recurrent laryngeal neuropathy. Two studies. One common theme: developing innovative surgical techniques that are less invasive, mechanically stronger, and designed to improve long-term outcomes for equine patients. Let's dive in.

Lepage et al. Study: Evaluating a Minimally Invasive, Endoscopically Assisted Transcutaneous Balloon Catheter Placement Technique (TGPC) into the Medial Guttural Pouch Compartment.

SPEAKER_03 1:50

Imagine uh navigating a surgical instrument through a space where just a one millimeter slip means, you know, catastrophic arterial bleeding.

SPEAKER_02 1:58

Or permanent nerve damage. I mean, it is the absolute definition of high-stakes real estate.

SPEAKER_03 2:03

Right. That is the reality of the equine guttural pouch. For you listening, you likely already know it is a notorious anatomical minefield.

SPEAKER_02 2:10

It really is. The margins for error with conditions like guttural pouch mycosis or um MPMA are just razor thin. But this recent paper, Lebage et al. presents a pretty elegant workaround.

SPEAKER_03 2:25

Yeah, the transcutaneous guttural pouch catheterization, or TGPC. So our mission today is to dive into exactly how this shifts the whole surgical approach.

SPEAKER_02 2:34

Exactly, moving us away from those massive open dissections.

SPEAKER_03 2:37

So basically, instead of laying the area open, they're placing a 20 French balloon catheter straight into the medial compartment.

SPEAKER_02 2:44

Right. And they're doing this in a standing sedated horse with endoscopic guidance, of course.

SPEAKER_03 2:48

Aaron Powell But a 20 French catheter is, well, it's pretty substantial. Like it's large enough to handle high flow rates. How do they navigate that past the maxillary vein and the stylohyoid bone without causing a total disaster?

SPEAKER_02 3:00

Aaron Powell It operates on a sort of ship and a bottle mechanism. The collapsed catheter navigates that narrow bottleneck first.

SPEAKER_03 3:07

Oh, and then inflates once it's inside.

SPEAKER_02 3:09

Exactly. Once it is safely positioned in the broader space of the medial compartment, the balloon inflates. It acts like a temporary access hatch.

SPEAKER_03 3:19

Wait, but if you leave a physical balloon pressed up against that incredibly delicate mucosa, I mean the paper said they left them in for anywhere from four to seventeen days. How do you not cause pressure necrosis?

SPEAKER_02 3:30

That is a highly valid

Calibrated Caliber and Volumes: Achieving a 100% surgical success rate with zero major nerve or arterial damage while establishing a line to deliver 1-liter daily lavages or 15 L/min of fungal-starving oxygen therapy.

SPEAKER_02 3:31

concern, right? But the data from the 15 procedures in the study actually showed a 100% success rate.

SPEAKER_03 3:36

Wow, with zero major nerve damage.

SPEAKER_02 3:39

Zero major nerve or arterial damage. The inflation is calibrated so it holds the catheter firmly without crushing those adjacent structures.

SPEAKER_03 3:46

Aaron Powell So having that secure temporary line allows surgeons to just deliver massive therapeutic volumes daily. Like they were doing one liter lavages, right?

SPEAKER_02 3:55

Aaron Powell Yeah, or up to 15 liters of oxygen per minute.

SPEAKER_03 3:58

Aaron Powell Pumping 15 liters of oxygen into a confined space that is specifically to create a hyper-oxygenated environment, I assume, to kill off the anaerobic fungi.

SPEAKER_02 4:08

Precisely. It aggressively starves out those pathogens. And you know, they achieved all of this while completely avoiding the severe risks of general anesthesia.

SPEAKER_03 4:17

Aaron Powell But there has to be some trade-off. What kind of complications are actually showing up in the OR or, well, during that two-week recovery phase?

SPEAKER_02 4:24

Aaron Powell It is not entirely without minor issues. I mean, superficial venous bleeding happened in about 21% of cases.

SPEAKER_03 4:30

Aaron Powell Okay, but that is easily controlled with a standard compression bandage, right?

SPEAKER_02 4:34

Exactly. Yeah. And 100% of the horses did develop skin abrasions under the external fixation ring, but those were completely manageable.

SPEAKER_03 4:41

Aaron Powell And what about the healing after you remove it?

SPEAKER_02 4:43

Aaron Powell That is the real surgical advantage here. Once removed, the pouch sealed within 72 hours.

SPEAKER_03 4:48

Wow, that is fast.

SPEAKER_02 4:50

Yeah. Achieving full second intention healing in under 10 days.

SPEAKER_03 4:53

So the ability to aggressively lavage and clear that space over several days without repeated trauma is just a game changer. But you know, it brings up a broader issue with flushing and clearance in general.

SPEAKER_02 5:05

It really does. Because fluid mechanics matter.

SPEAKER_03 5:07

Right, right. Whether you are clearing the guttural pouch or just closing up a primary and orthopedic surgery, if you are just using standard fluids, how much

Simini Protect Lavage Study: Addressing the 42% bacterial remainder left by standard saline versus the 0% baseline achieved by a 60-second surfactant wash to secure closures.

SPEAKER_03 5:17

of that bacterial load are you actually removing?

SPEAKER_02 5:19

Aaron Powell Well, that is a massive clinical blind spot in almost every routine closure protocol. We know most surgeons just default to saline to rinse before closure.

SPEAKER_03 5:28

Aaron Powell Sure, it is standard practice.

SPEAKER_02 5:30

But independent head-to-head studies show standard saline actually leaves 42% of bacteria behind in the surgical site.

SPEAKER_03 5:40

Well, it's asking for trouble.

SPEAKER_02 5:41

Aaron Powell Which is exactly the gap Semini Protect Livage fills. It is a non-antibiotic lavage designed to reinforce those existing closure protocols.

SPEAKER_03 5:49

So while saline leaves 42% behind, Semini leaves 0%.

SPEAKER_02 5:54

Exactly, 0%. It specifically targets resistant bacteria and biofilms. And the best part is it takes just 60 seconds prior to suturing, so it doesn't disrupt your workflow at all.

SPEAKER_03 6:04

It is really about working smarter, not just washing harder.

SPEAKER_02 6:08

Right. And bringing that back to Lapage et al. 2026, the core take-home message here is that TGPC with a 20-french balloon catheter is absolutely a safe, viable standing procedure. It allows for prolonged treatment of the guttural pouch while completely bypassing the major risks of open surgery.

SPEAKER_03 6:27

So think about your own practice for a second. If a simple catheter can safely bypass the dangers of the guttural pouch, literally tiptoeing through an anatomical minefield, what other historically untouchable surgical regions are just waiting for a similar, minimally invasive workaround? Something to think about before you scrub in next.

SPEAKER_01 6:47

Continuing with the next published study.

Ysebaert et al. (Yisber et al.) Study: Ex Vivo Biomechanical Comparison of Three Prosthetic Laryngoplasty Constructs for Recurrent Laryngeal Neuropathy.

SPEAKER_02 7:07

Oh yeah. You tie it off and feel great about it.

SPEAKER_03 7:09

Right. But then fast forward just what, six weeks? And the abduction has already dropped one or two grades.

SPEAKER_02 7:15

It is just incredibly disheartening. I mean, despite your absolute best surgical technique, those success rates still stubbornly sit between uh 45 and 70 percent.

SPEAKER_03 7:25

Yeah.

SPEAKER_02 7:26

The construct simply degrades under all that constant physiological stress.

SPEAKER_03 7:30

Aaron Powell Which brings us to a really compelling ex vivo study for this deep dive. It's by Yeesbear et al. 2025.

SPEAKER_02 7:36

Yes, a fascinating paper.

SPEAKER_03 7:37

Aaron Powell Right. They're looking at what actually happens mechanically when we swap out the standard suture for two different metallic implants. So a suture anchor

The Suture Anchor Leverage Advantage: Exploring how placing a suture anchor at a more dorsal traction point acts as a highly efficient mechanical lever, requiring only 8.31 N of force to achieve 88% arytenoid abduction.

SPEAKER_03 7:45

and a novel tie bolt.

SPEAKER_02 7:46

Aaron Powell Exactly. Ultimately, we want to know what you might actually change in your surgical approach tomorrow, you know, to stop those relentless swallowing forces from just ruining your construct.

SPEAKER_03 7:56

Aaron Powell So to figure that out, they randomized 30 equine cadaver larynges into three groups. Aaron Powell Right.

SPEAKER_02 8:02

So you have the standard suture control, a suture anchor placed in the muscular process, and then the tie bolt. And I mean the baseline force data for the suture anchor is really striking.

SPEAKER_03 8:12

Oh wow, yeah.

SPEAKER_02 8:13

To achieve 88% abduction, the suture anchor required just 8.31 newtons of force.

SPEAKER_03 8:19

Aaron Powell Well, the standard construct takes, what, around 12 newtons?

SPEAKER_02 8:22

Exactly. Nearly 12 newtons for both the standard and the tie-bolt constructs.

SPEAKER_03 8:26

Okay, but mechanically, why does the suture anchor need so much less force? Like, is it just about where it sits anatomically?

SPEAKER_02 8:33

Aaron Powell Yes, exactly. So by placing the anchor at a more dorsal traction point on the muscular process, you are essentially building a more efficient lever.

SPEAKER_03 8:41

Ah. So you increase the mechanical advantage.

SPEAKER_02 8:43

Right. Think about it in terms of physiological load. I mean a horse swallows over 1,100 times a day.

SPEAKER_03 8:48

That is a lot of swallowing.

SPEAKER_02 8:49

It really is. And each swallow adds roughly 50 newtons of force to your surgical construct.

SPEAKER_03 8:55

Wow.

SPEAKER_02 8:55

So if you can lower the baseline force needed just to hold the aeritoid open, you drastically reduce the total stress the construct endures over its lifespan.

SPEAKER_03 9:04

Okay, so the suture anchor elegantly solves the problem of that baseline resting tension. But that doesn't fully address the kinetic energy of the actual swallow, right?

SPEAKER_02 9:14

No, it doesn't.

SPEAKER_03 9:15

Because that cyclical stretching still has to go somewhere. And I'm guessing that's where the tie bolt comes in.

SPEAKER_02 9:20

Exactly. So while the suture anchor gives you a mechanical advantage, the tie bolt delivers superior mechanical stability. They tested this with cyclical loading to mimic those thousands of swallows.

SPEAKER_03 9:32

Right, to see what happens over time.

SPEAKER_02 9:34

Yeah, and the tie bolt showed the least elongation by far, just 2.62 millimeters of stretch. It also withstood a massive ultimate load of 367 newtons.

SPEAKER_03 9:45

Compared to the 238 for the standard control.

SPEAKER_02 9:48

Exactly.

SPEAKER_03 9:48

I want to visualize this tie bolt, though, because just calling

Bypassing the Cheese-Wire Effect: Explaining how the tie bolt's wide titanium footprint distributes dynamic force to effectively eliminate standard linear suture slice-through failure patterns.

SPEAKER_03 9:51

it a titanium tunnel doesn't quite explain why it's so much stiffer. Like how is it physically interacting with the cartilage differently than a standard suture?

SPEAKER_02 9:59

Well, think about how a standard construct fails clinically. The suture concentrates all that tension into a tiny linear focal point.

SPEAKER_03 10:08

Right. It acts like a cheese wire.

SPEAKER_02 10:09

Yes, exactly like a cheese wire. And it just cuts right through the cartilage. The tie bolt, on the other hand, is a solid titanium structure that the suture actually passes through.

SPEAKER_03 10:19

Oh, I see.

SPEAKER_02 10:20

Because of its larger footprint, it distributes all that kinetic force over a much wider surface area of the cartilage.

SPEAKER_03 10:27

Which completely changes the failure mode. Because, I mean, in this study, the standard failed by

Tissue Outlasting Integrity Paradox: Understanding why pushing the tie bolt construct to failure caused a cartilege fracture rather than implant breakdown, proving absolute secure structural fixation.

SPEAKER_03 10:33

cutting through, the suture anchor eventually pulled out, but under extreme load, the tie bolt actually fractured the erotinoid cartilage before the implant failed.

SPEAKER_02 10:42

That's right.

SPEAKER_03 10:42

Wait, fracturing the cartilage sounds like a complete surgical disaster. Why is that considered a positive outcome here?

SPEAKER_02 10:49

I know, it sounds totally counterintuitive. But from a purely biomechanical standpoint, it proves the integration is incredibly secure.

SPEAKER_03 10:56

Oh, because the implant holds up.

SPEAKER_02 10:58

Exactly. The tie bolt transfers the force from the suture directly to the robust metallic implant so effectively that the implant itself outlasts the structural integrity of the surrounding tissue.

SPEAKER_03 11:10

Making it stronger than the cartilage itself.

SPEAKER_02 11:12

Right. It virtually eliminates that dreaded suture cut-through effect we see with standard techniques.

SPEAKER_03 11:18

So if you are scrubbing in tomorrow, it seems like you're choosing between two distinct mechanical advantages here. The suture anchor allows you to achieve abduction with less baseline force, minimizing the overall resting load. Yeah. But the tie bolt creates a highly stiff construct that brilliantly resists all that long-term cyclical stretching.

SPEAKER_02 11:38

Aaron Powell It really comes down to prioritizing either a more efficient lever or an incredibly stable force-distributing anchor. Both implants solve different halves of the degradation problem.

SPEAKER_03 11:50

Aaron Powell Which leaves us with an obvious, if completely untested, question for this deep dive. If the suture anchor solves the resting tension and the tie bolt solves the dynamic stretch, is there a world where you use both?

SPEAKER_02 12:03

Oh, that is an interesting thought.

SPEAKER_03 12:05

Right. It's not evaluated in this paper, but combining both implants into a single degradation-proof construct is exactly the kind of hybrid biomechanics you might want to start thinking about before making your next incision.

SPEAKER_01 12:20

That's it for this episode of the Simony Surgery Podcast. This show is brought to you by Simony Protect Livage, our interoperative lavage developed to target resistant bacteria and biofilms where traditional solutions of saline and post op antibiotics fall short. If you're interested in learning more or trying it in your own procedures, you'll find information and links in the show notes. Thanks for listening, and we'll see you in the next episode.