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How Surgeons Reduce Infection Risk in Dogs’ Orthopedic Surgery

How Surgeons Reduce Infection Risk in Dogs’ Orthopedic Surgery

Best Practices

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Vets

Find out how surgeons protect your dog from infection during orthopedic surgery with proven aseptic protocols and post-op care strategies.

By 

Sustainable Vet Group

Updated on

July 17, 2026

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This article is for informational purposes only and is not a substitute for professional veterinary advice. Every case is unique, so always consult your veterinarian for guidance specific to your pet.

This content is intended for veterinary professionals for educational purposes. It does not replace clinical judgment or tailored advice. Always rely on your training, expertise, and the specific context of your patients.

How Surgeons Reduce Infection Risk in Dogs’ Orthopedic Surgery

Orthopedic surgery in dogs carries a higher infection risk than most other procedures. The presence of metal implants, extended operating times, and the unavoidable disruption to soft tissue all create conditions where bacteria can establish if technique falters.

What separates a 1% infection rate from an 8% one often isn't the procedure itself. It's the systematic application of multiple overlapping precautions before, during, and after surgery.

 

Quick answer: Surgeons reduce orthopedic infection risk through layered precautions: strict sterile field management, perioperative antibiotic prophylaxis (cefazolin 30 to 60 minutes before incision, repeated every 90 minutes), iodine-impregnated surgical drapes, orthopedic gloves, antimicrobial suture materials, thorough intraoperative lavage, and post-closure bandaging with antimicrobial cream. A published protocol change study found these combined measures reduced implant-associated infection rates from 8.5% to 1.3% in TPLO cases.

 

Key takeaways

  • Antibiotic prophylaxis timing is critical: cefazolin given 30 to 60 minutes before incision, not after.
  • Iodine-impregnated adhesive drapes reduce bacterial contamination of the operative field significantly.
  • Orthopedic gloves reduce perforation risk compared to standard surgical gloves during implant work.
  • Antimicrobial sutures have replaced staples in high-evidence protocols, reducing SSI rates.
  • Perioperative antibiotics alone match peri- and postoperative protocols in clean procedures like TPLO.
  • Protocol changes reduced TPLO infection rates from 8.5% to 1.3% in a published 703-dog study.

Why orthopedic surgery carries elevated infection risk

Infection risk in orthopedic surgery is higher than in soft tissue procedures for three interconnected reasons.

First, metal implants provide a surface for bacterial adhesion. Once bacteria form a biofilm on a plate or screw, systemic antibiotics struggle to penetrate the protective matrix. This can make implant-associated infections extremely difficult to resolve without removing the hardware.

Second, orthopedic procedures are typically longer. Extended operating time increases cumulative exposure of the wound to the environment, increases the number of glove changes required, and raises the chance of sterile field compromise.

Third, bone surgery disrupts local blood supply. Reduced perfusion impairs the immune response at the operative site and slows the delivery of systemic antibiotics to the tissue where bacteria are likely to establish.

For more on the pathogens most commonly implicated in post-surgical orthopedic infections, see MRSP as a key orthopedic infection risk.

Antibiotic prophylaxis: timing, choice, and duration

The correct protocol

The published evidence base for perioperative antibiotic prophylaxis in dogs undergoing TPLO and other clean orthopedic procedures supports a consistent protocol. Standard practice includes intravenous cefazolin given 30 to 60 minutes before skin incision, then repeated every 90 to 120 minutes intraoperatively.

A 2025 study published in Veterinary Sciences (PMC11946642) compared dogs receiving perioperative antibiotics only against those receiving peri- and postoperative antibiotics for 7 to 10 days. The finding: no significant difference in SSI rates between groups. The conclusion was that extending antibiotic use into the postoperative period is unnecessary for clean orthopedic procedures and contributes to antimicrobial resistance without benefit.

Why this matters for antimicrobial stewardship

Limiting antibiotics to the perioperative window aligns with evidence-based antimicrobial stewardship. Postoperative antibiotic courses in clean cases add resistance pressure without reducing infection rates. Surgeons who follow this protocol achieve equivalent or better infection outcomes while reducing antibiotic exposure.

For more on antibiotic selection and resistance considerations in surgical wound infections, see antibiotic prophylaxis in orthopedic surgery.

Sterile field management

Iodine-impregnated adhesive drapes

One of the most impactful protocol changes documented in the TPLO literature is the addition of iodophore-impregnated adhesive drapes. These drapes are applied directly to the skin around the operative site before incision. They reduce the chance of skin flora migrating into the wound during surgery and create an impervious barrier between the surgical field and surrounding tissue.

Veterinary Practice News confirms: "Iodine-impregnated sheets applied to the patient during surgery and use of impervious barriers decrease chances of SSIs."

Glove management

Standard surgical gloves have a meaningful perforation rate during orthopedic procedures involving retractors, bone saws, and implants. Two practices address this:

  • Orthopedic surgical gloves are thicker and more puncture-resistant than standard gloves
  • Double-gloving provides a backup layer if the outer glove is perforated
  • Gloves should be changed after draping the patient and after 60 minutes of surgery

The published TPLO protocol change study (PMID 29878479, 703 dogs) specifically included the switch to orthopedic surgical gloves as one of the protocol modifications that reduced implant-associated infection from 8.5% to 1.3%.

Intraoperative technique

Wound lavage

Intraoperative lavage with sterile saline removes bone debris, blood clots, and contaminating bacteria before wound closure. The 2025 TPLO study protocol included: "A final lavage with sterile saline solution was carried out" followed by a culture swab of the surgical field around the implants.

Lavage is particularly important in orthopedic surgery because blood and tissue debris create ideal conditions for bacterial adhesion to implant surfaces. Removing this substrate reduces the bacterial load at the most vulnerable point: just before closure.

Dead space elimination

Closing in anatomical layers without dead space reduces the post-operative fluid accumulation where bacteria can proliferate. The 2025 study protocol notes: "Care was taken in closing, avoiding any dead spaces."

The fascial plane and subcutis are typically closed with continuous absorbable monofilament suture. Skin closure follows with interrupted or continuous non-absorbable material.

Antimicrobial sutures

The landmark protocol change study replaced skin staples with triclosan-coated intradermal sutures. Triclosan is an antimicrobial agent incorporated into the suture material that inhibits bacterial colonization of the suture itself. This change was one component of the protocol bundle that reduced infection rates by 85%.

Post-closure measures

Antimicrobial bandaging

After wound closure, application of antimicrobial cream (mupirocin or similar) combined with a soft-padded bandage reduces wound contamination while the dog is still in hospital. Veterinary Practice News recommends: "Application of an antimicrobial cream and a light bandage before leaving the operating table."

E-collar at discharge

An Elizabethan collar prevents licking of the surgical site, which would introduce oral bacteria directly to the wound. The published protocol change study included E-collar placement as part of the modified protocol.

Single-use gloves for post-operative handling

Hospital staff handling the dog after surgery should use single-use gloves each time they contact the operated site. This prevents cross-contamination between patients and between wound contacts in the same patient. The TPLO study protocol explicitly included "use of single-use gloves while handling treated dogs" as one protocol modification.

Patient selection as an infection risk factor

Not all dogs carry equal infection risk. Surgeons identify and account for patient-level risk factors before proceeding:

  • Obesity: excess body weight impairs blood flow to the wound and slows healing
  • Diabetes or Cushing's disease: impaired immune function and healing
  • Skin fold breeds: higher baseline bacterial load on skin surfaces
  • Pre-existing skin infections: active pyoderma anywhere on the body is a contraindication to elective orthopedic surgery until resolved

For the broader clinical protocols that support these intraoperative practices, see the clinical protocols behind infection risk reduction. For how these techniques fit within surgical site infection prevention, see surgical site infection prevention in dogs.

The combined effect: what the evidence shows

The most compelling evidence for the layered approach comes from the 703-dog TPLO study (PMID 29878479). When comparing a standard protocol against a modified protocol incorporating multiple simultaneous changes, implant-associated infection requiring plate removal dropped from 8.5% to 1.3%.

No single change accounted for the full reduction. The protocol bundle worked because each measure addressed a different vulnerability in the infection pathway. This is the core argument for overlapping precautions rather than relying on antibiotics or sterile technique alone.

The 2025 randomized comparison further confirms that perioperative antibiotics, correctly timed and correctly dosed, are sufficient for clean orthopedic procedures. Adding postoperative courses doesn't improve outcomes but does add resistance pressure.

For biofilm prevention as part of infection risk reduction, see biofilm prevention as part of infection risk reduction.

Frequently asked questions

Will my dog definitely get antibiotics before orthopedic surgery?

Yes. Perioperative antibiotic prophylaxis with cefazolin is standard practice for all clean orthopedic procedures in dogs. The timing, 30 to 60 minutes before incision, is critical to achieving adequate tissue levels at the time of surgery. Ask your surgeon to confirm the protocol if you want clarity.

How long do post-surgical antibiotics last after orthopedic surgery?

Evidence supports limiting antibiotics to the perioperative window (intraoperative doses only) for clean orthopedic procedures. If your dog is sent home with a 5 to 10 day antibiotic course, ask your surgeon why: there may be a patient-specific reason, or it may reflect older practice patterns now challenged by current evidence.

Can my dog's skin condition affect infection risk during orthopedic surgery?

Yes. Active skin infections (pyoderma) anywhere on the body are a contraindication to elective orthopedic surgery because bacteria can travel through the blood to colonize the implant. Your surgeon should perform a full skin assessment before scheduling. Any skin infection must be fully resolved first.

The gap between a 1% and an 8% infection rate in orthopedic surgery is almost never explained by a single failure. It is explained by the cumulative effect of multiple small precautions, each individually modest, that together create a system where bacteria have fewer opportunities to establish at every stage of the procedure.

Resources

  • Porporato et al. Comparison of SSI Rates in Dogs Undergoing TPLO Using Perioperative Versus Peri- and Postoperative Antimicrobial Prophylaxis. Vet Sci, 2025. pmc.ncbi.nlm.nih.gov
  • Fitzpatrick & Solano. Protocol changes to reduce implant-associated infection after TPLO: 703 dogs. PubMed, 2011. pubmed.ncbi.nlm.nih.gov
  • Veterinary Practice News. Old and new thoughts on infection control. veterinarypracticenews.com

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Step #1

Getting Ready

Ensuring a clean surgical field starts with proper skin preparation. This video demonstrates the best practices for:

  • Shaving the patient – Achieving a close, even shave while minimizing skin irritation
  • The Dirty Scrub – The initial skin prep step to remove surface debris and reduce bacterial load before the sterile scrub.

Following these techniques helps reduce infection risk and improve surgical outcomes. Watch the video to see how it’s done effectively!

Step #2

Reduce Your Risks

Many surgeons are shocked to find out that their patients are not protected from biofilms and resistant bacteria when they use saline and post-op antibiotics.

That’s Where Simini Comes In.

Why leave these risks and unmanaged?  Just apply Simini Protect Lavage for one minute. Biofilms and resistant bacteria can be removed, and you can reduce two significant sources of infection.

Step #3

Take the Course

Preventing surgical infections is critical for patient safety and successful outcomes. This course covers:

  • Aseptic techniques – Best practices to maintain a sterile field.
  • ​Skin prep & draping – Proper methods to minimize contamination.
  • ​Antibiotic stewardship – When and how to use perioperative antibiotics effectively.

Stay up to date with the latest evidence-based protocols. Click the link to start learning and earn CE credits!

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