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External Fixators and Internal Plating: When Are These Indicated?

External Fixators and Internal Plating: When Are These Indicated?

Best Practices

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When do dogs need external fixators vs. internal plating? Learn key indications, pros, and real case examples in veterinary fracture repair

By 

Sustainable Vet Group

Updated on

August 13, 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.

External Fixators and Internal Plating: When Are These Indicated?

When a dog breaks a bone, the surgical goal is to stabilize the fracture so it heals correctly. Two of the most common methods are external skeletal fixation and internal plate fixation.

Choosing between them depends on the fracture type, location, the dog's size and health, and the presence of any concurrent wounds or infection.

 

Quick answer: External fixators use pins through the skin connected to an external frame; internal plates fix directly to bone. External fixators suit open fractures and contaminated bone. Internal plating is preferred for most closed fractures and needs less daily home care.

 

Key takeaways

  • External fixators use pins through the skin connected to external bars; preferred for open fractures and when internal implants would increase infection risk
  • Internal plating fixes a plate directly to bone under the skin; it provides rigid fixation for most closed long-bone fractures
  • Fracture type is the primary determinant: open or contaminated fractures favour external fixation; simple closed fractures favour internal plating
  • External fixators need daily pin-site cleaning to prevent tract infections, the most common complication
  • Internal plating is generally superior for most closed fractures; no direct head-to-head studies exist for all configurations
  • Both methods can be combined (hybrid fixation) for complex fractures requiring biological and mechanical advantages

External skeletal fixation (ESF)

What it is

External fixation is completed using a device called an external fixator. This specialized device consists of multiple pins and external bars or rings, which hold a fractured bone in place during the healing process.

Pins are placed through the skin and bone on either side of the fracture. These pins connect to an external frame bars in linear fixators, rings in circular (Ilizarov-type) fixators.

The frame holds the fracture in alignment without directly contacting the fracture site.

Types

Type I (uniplanar, unilateral): pins exit one side of the limb only; the simplest and most commonly used type.

Type II (biplanar, bilateral): pins exit both sides of the limb; more rigid than Type I.

Circular fixators: ring-based frames that allow gradual correction of complex deformities and angular limb corrections. More technically demanding.

When external fixation is indicated

External fixation is an effective procedure to correct complex fractures and angular limb deformities in dogs.

Key indications:

  • Open fractures with skin wounds communicating with the fracture site placing internal implants risks trapping contamination
  • Infected or contaminated bone external fixation avoids implant-associated biofilm infection
  • Soft tissue compromise severe bruising, degloving, or burn injury around the fracture
  • Angular limb deformities gradual correction is possible with circular fixators
  • Skeletally immature dogs where growth plates need to be protected
  • Temporary stabilization before definitive repair (damage control orthopaedics)

Limitations and home care

External fixators require daily pin-site care by the owner cleaning around each pin to prevent tract infection. Pin-tract infection is the most common complication and can require early removal if severe.

The external frame can be bulky and requires the dog to avoid catching it on furniture or other dogs.

Internal plate fixation

What it is

Internal plating fixes a metal plate directly to the bone surface using cortical screws. The plate bridges the fracture and holds the bone in alignment during healing.

Everything is under the skin; no external components are visible once the wound is closed.

In all but the most minor fractures, internal fixation is superior to external fixation. Typically implants are made from inert metals such as stainless steel and take the forms of pins, plates, screws, or wires.

When internal plating is indicated

The advantages of addressing long bone fractures with internal fixation versus external coaptation include early return to function and maintenance of joint motion. Internal fixation is indicated for fractures that are subjected to compression, shearing, and/or tensile forces.

Key indications:

  • Closed long-bone fractures in medium and large breeds radius/ulna, femur, tibia, humerus
  • Articular fractures where precise anatomical reduction is essential
  • Highly comminuted closed fractures where external fixation cannot achieve adequate stability
  • Periprosthetic fractures around existing implants
  • Fractures requiring early weight bearing plates provide more rigid fixation than most external frames

Plate types

Locking plates (LCP): the most commonly used system in modern veterinary orthopaedics. Screws lock into the plate, creating an angular-stable construct that does not rely on friction between the plate and bone.

Conventional dynamic compression plates (DCP): older design; still used in some straightforward fractures.

Specialty plates: T-shaped for proximal tibia, L-shaped for distal femur, curved for acetabular fractures.

Limitations

Internal plating requires open surgical access to the fracture, which temporarily disrupts the blood supply and soft tissue around the bone. In open or infected fractures, this approach increases infection risk.

Implant removal is sometimes required if pain or implant loosening develops, though many plates remain in place for life without issues.

Comparison summary

FactorExternal fixatorInternal plate
Open fracturesPreferredAvoided
Closed fracturesSecond choicePreferred
Infection/contaminationPreferredAvoided
Articular fracturesLimitedPreferred
Home care demandsHigh (daily pin care)Low
RigidityVariableHigh
Angular deformity correctionYes (circular)No
Cost (initial)Often lowerOften higher
Follow-up visitsMore frequentStandard

 

It is recommended that veterinarians base treatment choice on available orthopaedic equipment at their clinic and their personal experience with fracture stabilisation methods they are comfortable using. Both methods have potential risks and complications.

For the broader fracture management decision guide, see fracture management in dogs: when to splint or refer. For minimally invasive approaches to orthopedic repair, see minimally invasive orthopedic surgery for general practitioners.

Frequently asked questions

Which is better an external fixator or an internal plate?

Neither is universally better. The right choice depends on fracture type, whether the fracture is open or closed, the presence of contamination, the dog's size, and surgeon experience.

For most closed long-bone fractures in medium and large dogs, internal plating provides more reliable fixation. For open or infected fractures, external fixation is generally safer.

How long does a dog wear an external fixator?

Typically 6 to 10 weeks, until radiographic evidence of sufficient bone healing allows safe removal. The frame is removed under sedation or light anesthesia at the clinic.

Timeline varies by fracture severity, the dog's age, and healing rate.

Do internal plates need to be removed?

Not routinely. Most plates remain in place permanently without causing problems.

Removal is considered if the dog develops pain, implant loosening, or infection around the plate or occasionally in very young dogs where the plate may interfere with bone growth.

Can my dog bear weight with an external fixator?

Yes, often earlier than with splints or casts. One advantage of external fixation is that it allows some controlled weight bearing during healing, which promotes bone healing through mechanical stimulation.

Your vet will specify the allowed activity level.

What is hybrid fixation?

Hybrid fixation combines elements of both methods for example, a plate for primary stabilization with an external component for additional support.

It is used for very complex fractures where a single method cannot achieve adequate stability alone.

Resources

  • WagWalking. External Fixation in Dogs. wagwalking.com
  • WagWalking. Internal Fixation in Dogs. wagwalking.com
  • Today's Veterinary Practice. A Practitioner's Guide to Fracture Management, Part 3: Selection of Internal Fixation Technique. todaysveterinarypractice.com
  • PMC. Comparing Internal versus External Fixation for Diaphyseal Tibial and Fibular Fractures in Skeletally Immature Dogs. pmc.ncbi.nlm.nih.gov
  • VIN / WSAVA 2016. External Skeletal Fixation: Options and Techniques. vin.com

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