Veterinary Surgery February 2026 – Ortho Part 1: Limb Sparing Biology & Safe Arthrocentesis Techniques

In this Simini Small Animal Surgery Podcast episode, we kick off our orthopedic coverage from the February 2026 issue of Veterinary Surgery with two studies focused on refining both complex surgical decision-making and everyday orthopedic techniques. 

From limb-sparing surgery in osteosarcoma to safe approaches for stifle arthrocentesis, these papers highlight how both high-level strategy and small technical choices can significantly impact patient outcomes. 

In this episode: 

✅ Altwal et al. — A comprehensive review of canine limb-sparing techniques for appendicular osteosarcoma, including cortical allografts and 3D-printed prostheses. While these techniques aim to preserve limb function, infection remains the dominant complication, with rates as high as 70% in distal radius cases. Interestingly, dogs that developed infections showed longer median survival (480 days vs. 228 days), likely due to immune activation, though infection remains a major cause of implant failure and secondary amputation. 

✅ McLean et al. — An ex vivo study evaluating four landmark-based techniques for stifle arthrocentesis. While all techniques achieved 100% joint access, safety varied significantly. The commonly used lateral intercondylar notch approach showed 0% cartilage injury, whereas the infrapatellar approach caused iatrogenic cartilage damage in 75% of cases, often affecting weight-bearing surfaces. 

Together, these studies reinforce a key principle in orthopedic surgery: success depends on both mastering complex procedures and refining the small technical details we perform every day.  

🎓 Journal Articles Discussed 

• Altwal et al. — Surgical limb-sparing in veterinary medicine: A review of existing techniques in dogs
• McLean et al. — Accuracy and safety of stifle arthrocentesis and injection based on two established and two new landmarks: Ex vivo study in dogs

📚 From the February 2026 issue of Veterinary Surgery


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https://www.simini.com/evaluation-kit
 

Transcript

SPEAKER_01 0:04

Hi, I'm Carl Damiani, and this is the Simene Small Animal Surgery Podcast, your fast focused update on what matters most from the latest small animal 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 kicks off our combined orthopedic and soft tissue coverage from the February 2026 issue of veterinary surgery with two studies that sit right at the interface of technique, safety, and surgical decision making. First, we'll look at Altwal et al. a comprehensive review of surgical, limb-sparing techniques in dogs. This is a big picture paper covering indications, evolving techniques, and how we balance oncologic control with function. It's the kind of review that sharpens how you think about case selection and long-term outcomes. Then we turn to McLean et al., who evaluate the accuracy and safety of different landmark-based techniques for stifle arthrosyntesis. This one is deceptively practical, comparing commonly used approaches with newer techniques, and highlighting something we don't always think about, iatrogenic cartilage injury. The clinical takeaway here has real implications for everyday orthopedic procedures. Two studies, one shared theme, refining what we do every day from big reconstructive decisions to the smallest technical detail to make surgery safer and smarter. Let's dive in.

SPEAKER_00 1:56

It's Altwall et al.

SPEAKER_02 2:02

Yeah. So whether you're a busy veterinary surgeon scrubbing in tomorrow morning or, you know, just someone who loves understanding the cutting edge of medicine, this deep dive is for you. We're getting straight to the clinical punchline of what actually matters when a surgeon tries to save a dog's leg.

SPEAKER_00 2:16

Exactly. So to set the stage, Altwall et al. looks at appendicular osteosarcoma, which is really just the technical term for bone cancer in the limbs. Historically, the standard treatment is amputation. Right. But limb sparing offers this alternative where surgeons remove the cancerous bone and replace it. They use either a cortical allograft, which is essentially donor bone from a phone bank, or a custom 3D printed titanium endoprosthesis.

SPEAKER_02 2:41

Aaron Powell To me, I mean, it sounds like retrofitting a classic car with futuristic parts. You'd think the main surgical challenge would be purely mechanical, like perfectly sizing and bolting that titanium to the remaining bone.

SPEAKER_00 2:54

Aaron Powell You would think so, yeah. The engineering is certainly complex, but the real battle isn't mechanical at all. It's biological.

SPEAKER_02 3:00

Aaron Powell Wait, really? Biological.

SPEAKER_00 3:02

Yeah. The high yield data from this review points to one overwhelming complication, and that is infection. When surgeons operate on the distal radius, so the lower part of the dog's front leg infection rates skyrocket up to like 70%.

SPEAKER_02 3:17

Wow. 70% is a massive failure rate.

SPEAKER_00 3:20

It's huge. And it's that biological failure, not the titanium, that ultimately causes the implant to fail.

SPEAKER_02 3:26

Aaron Powell, but here's that mind-bending statistic from the data. The dogs that develop these surgical site infections after a limb spare actually live twice as long, right?

SPEAKER_00 3:34

Yeah, it's wild. We're looking at a median survival time of 480 days for the infected dogs compared to just 228 days for the uninfected ones.

SPEAKER_02 3:43

I mean, looking at those numbers, part of me wants to skip washing my hands and just intentionally leave the surgical wound a little dirty just to fight the cancer.

SPEAKER_00 3:50

Aaron Powell Please, uh, please do not do that. I know you're joking, but to understand why that is a terrible idea, we have to look at how this paradox actually works. Right. So when bacteria invade the surgical site, it sets off massive alarms in the dog's immune system. It essentially wakes up these aggressive immune cells called macrophages.

SPEAKER_02 4:10

Aaron Powell And they swarm the area to fight the bacteria.

SPEAKER_00 4:13

Exactly. But while they're highly active, they cross-react and basically begin attacking the residual cancer cells as well.

SPEAKER_02 4:21

Aaron Powell So the localized infection acts as this brutal accidental immunotherapy.

SPEAKER_00 4:26

It does. But the obvious catch is that while the immune system is destroying the cancer, the infection is also destroying the very limb you just tried to save.

SPEAKER_02 4:34

Yeah, that's the harsh reality. The data shows those infections are responsible for 39% of all secondary amputations in these dogs.

SPEAKER_00 4:42

Right. You just can't afford to have the limb fall apart because the hardware gets infected. The ultimate goal is saving the limb and the dog. So precise, absolute bacterial control at the surgical site remains totally non-negotiable. You're walking an incredibly tight rope.

SPEAKER_02 4:58

And as a surgeon, you're already rinsing the site with standard saline before closing the wound. But if infection is this catastrophic to the implant, the data suggests saline just isn't cutting it.

SPEAKER_00 5:09

No, it really isn't. Independent head-to-head studies show that a standard saline rinse leaves uh about 42% of bacteria behind. Saline doesn't kill or unstick bacteria.

SPEAKER_02 5:20

It just waters it down.

SPEAKER_00 5:21

Yeah, it essentially just dilutes the surgical field and moves the bacteria around. You're leaving a massive blind spot right before you suture.

SPEAKER_02 5:28

Aaron Powell, which brings us to the clinical upgrade surgeons are integrating right at the point of closure, which is Symony Protect Livage.

SPEAKER_00 5:35

Right.

SPEAKER_02 5:36

This is a non-antibiotic lavage, meaning it doesn't contribute to antimicrobial resistance. But instead of just washing over the bacteria like saline, it mechanically disrupts their ability to cling to the tissue in the titanium.

SPEAKER_00 5:48

And that mechanical disruption is the key. Because it prevents bacterial adhesion, it washes them away completely. Saline leaves 42% behind, but Semini leaves 0%.

SPEAKER_02 5:59

Wow, 0%.

SPEAKER_00 6:00

Yeah, it's a really simple 60-second step that secures that 3D printed implant without altering the surgical workflow.

SPEAKER_02 6:07

So the major takeaway from Altwall et al. 2026 is that successful limb sparing requires more than just perfectly engineered titanium parts. You really have to balance those advanced biomechanics with relentless biological risk management.

SPEAKER_00 6:21

Exactly. The hardware only succeeds if you control the biology around it.

SPEAKER_02 6:25

Which leaves you with something fascinating to mull over. If an accidental localized bacterial infection can wake up the immune system enough to double a dog's survival time against bone cancer. Yeah. Well, how far are we from engineering a synthetic, targeted immune trigger? Imagine a localized therapy that completely destroys residual cancer cells without destroying the dog's new leg in the process.

SPEAKER_00 6:46

Oh man, that is definitely the next great frontier for veterinary oncology.

SPEAKER_02 6:50

Absolutely. You can find the full link to Altwell It's All 2026 in the show notes. Until next time, remember, sometimes the hardest part of the surgery isn't the metal, it's the biology fighting back.

SPEAKER_01 7:05

Continuing with the next published study.

SPEAKER_00 7:24

Yeah, I mean, it really is a staggering statistic, uh, especially for something we all do every single day.

SPEAKER_02 7:29

Right. So welcome to today's deep dive. Our mission is to extract decision-making intelligence specifically for you, the busy small animal veterinary surgeon.

SPEAKER_00 7:39

Aaron Powell And today we're looking at McLeanOtall 2026, because stifle arthrentesis and injection are incredibly common, but uh the clinical challenge is real. Are we inadvertently damaging the joint while trying to diagnose or treat it?

SPEAKER_02 7:55

Aaron Powell Okay, let's unpack this.

SPEAKER_00 7:56

Yeah.

SPEAKER_02 7:57

Because comparing landmark-based stifle injections to parallel parking a car blindfolded.

SPEAKER_00 8:02

That's a good analogy.

SPEAKER_02 8:03

Right. Like you might get into the space, but are you scraping the bumper on the way in? Yeah. Or in this case, you know, the cartilage.

SPEAKER_00 8:08

Exactly. So since we know the stakes of scraping the bumper, let's look at how McLean evaluated our routine techniques.

SPEAKER_02 8:14

Aaron Powell Yeah. How do they actually test this?

SPEAKER_00 8:16

Well, this was an ex vivo study. They used 32 canine cadaver limbs to test four specific landmark techniques.

SPEAKER_02 8:23

Aaron Powell Okay, what were the four?

SPEAKER_00 8:25

So we have the lateral intercondylar notch, or L A N C, then the infrapatellar INFRA, and two novel techniques. Uh the superpatellar, which is superpara, and proximal lateral parapetellar pouch, or just POCH.

SPEAKER_02 8:40

Right, but wait, I have to jump in here.

SPEAKER_00 8:41

Right.

SPEAKER_02 8:42

Because the paper mentioned that all four of these techniques were 100% accurate for entering the joint.

SPEAKER_00 8:47

Yes, 100%.

SPEAKER_02 8:48

So if they're all accurate, is the difference in safety just like a matter of anatomical real estate? Like forcing a needle through a tighter anatomical bottleneck?

SPEAKER_00 8:57

What's fascinating here is that's exactly it. Accuracy does not equal safety. The survey showed 87.5% of surgeons use LINC, and thankfully it caused 0% iatrogenic articular cartilage injury or IACI.

SPEAKER_02 9:12

Okay, well that's a huge relief for most of us.

SPEAKER_00 9:14

Yeah, it is, yeah. However, INFRA, which is used by 12.5% of surgeons.

SPEAKER_02 9:19

Still a lot of people.

SPEAKER_00 9:20

Right. That one caused cartilage injury in a staggering 75% of stifles. And often directly on weight-bearing surfaces. Meanwhile, the novel Sup R technique resulted in 0% IACI.

SPEAKER_02 9:34

Okay, so how does this 75% injury rate dictate what you actually do in the OR tomorrow?

SPEAKER_00 9:42

Wow.

SPEAKER_02 9:42

Like if you are using the INFRA technique, you're taking a massive risk, right?

SPEAKER_00 9:47

Absolutely. If we connect this to the bigger picture, canine hyaline cartilage has very limited regenerative capability.

SPEAKER_02 9:55

Just doesn't heal well.

SPEAKER_00 9:56

Right. It doesn't just heal. Even tiny partial thickness iatrogenic scrapes can initiate progressive joint disease.

SPEAKER_02 10:02

Aaron Powell, which is crazy because you're usually injecting the joint to help it.

SPEAKER_00 10:06

Exactly. You risk creating the full thickness cartilage defects that actually drive osteoarthritis. So LANC remains a really safe standard, but the novel CPR technique is a highly safe alternative.

SPEAKER_02 10:17

Aaron Powell Even if it requires, you know, a few extra needle repositions while you learn it.

SPEAKER_00 10:22

Yeah, the learning curve is totally worth it.

SPEAKER_02 10:23

So here's your clinical punchline. Stick to LINC or start exploring superai, but avoid an FRA to protect your patient's weight-bearing cartilage.

SPEAKER_00 10:31

Definitely. And you know, the study notes something really interesting at the end. In human medicine, ultrasound guided injections vastly outperform these landmark-based ones.

SPEAKER_02 10:40

Oh wow. Yeah.

SPEAKER_00 10:41

It leaves you wondering how long until blind landmark-based stifle injections in veterinary medicine are completely replaced by image-guided techniques.

SPEAKER_02 10:51

That makes perfect sense. Why keep sliding the key blindly under the door when you could just look at a screen? Definitely something provocative to think about for your next orthopedic case. Check the show notes for the full article link, and we will catch you next time.

SPEAKER_01 11:07

That's it for this episode of the Simony Small Animal 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 out your own procedures, you'll find information and links in the show notes. For listening, and we'll see you in the next episode.