External Fixation: A Revolutionary Method for Fracture Treatment
External Fixators |
It
is a surgical method to stabilize and immobilize fractures without opening the
bone. It is considered one of the most versatile fracture treatments available.
They are also known as external skeletal fixators or frames. They are useful
for unstable fractures where internal fixation is not possible or is
contraindicated.
How It Works?
An External
Fixators system uses pins or wires that are placed through the skin and
into bones above and below the fracture site. The pins act as anchors to attach
the external fixator. It consists of metallic rods or bars that connect to the
pins and are secured outside the skin allowing the surgeon to align and hold
the broken bone fragments in proper position.
Types of External Fixation Devices
There are different types of external fixators based on their design and application:
Monoaxial Fixators
Monoaxial fixators are one of the most basic types that allow adjustments in
one plane only. They provide stability in compression or distraction of
fracture fragments. These are commonly used for injuries requiring minimal stabilization
like ankle or wrist fractures.
Circular Fixators
Circular fixators offer a 360-degree fixation by placing multiple rings around
a limb connected by struts or fixator rods. This allows manipulation of
fracture fragments in different vectors enabling multiplanar corrections.
Circular frames are ideal for managing complex fractures and limb lengthening
procedures.
Hybrid Fixators
Hybrid combine features of circular and linear fixators. They provide
a balance between stability and opportunities for corrections. These fixators
find application in situations needing sturdier stabilization than a monoaxial
frame.
Ilizarov Fixator
Developed by Russian orthopedic surgeon Gavriil Abramovich Ilizarov, this
circular frame design allows precise adjustment and application of distraction
osteogenesis methods. The technique stimulates new bone growth between
fragments for correcting deformities.
Half-Pin Versus Wire Fixation
Half pins are threaded pins that pass entirely through the bone fragment. Wire
fixation requires thin wires to be threaded through skin and bone around the
fracture site. Half pins offer a more secure grip but wires allow minimal soft
tissue stripping and more points of fixation. The choice depends on the
fracture morphology and location.
Applications of External Fixation
Some common clinical scenarios necessitating external fixation include:
- Open fractures with severe soft tissue damage where internal fixation poses
risk of infection
- Fractures in limbs with poor bone quality
- Limb injury accompanying vascular trauma
- Multiple trauma cases requiring stabilization before internal fixation
- Bone infections where intramedullary nailing is contraindicated
- Limb lengthening and reconstruction surgeries
- Treatment of tibial plateau and patellar fractures
- Spinal injuries with neurological deficits
Advantages of External Fixation
The main advantages of external fixation over internal fixation methods are:
- Minimally invasive with less soft tissue stripping
- Reduced risks of infection from implantation of foreign materials inside
bones
- Ability to monitor the fracture site and provide additional stabilization as
required
- Allows repeated adjustments for reduction and alignment of fragments
- Facilitates early motion of adjacent joints
- Versatile options for treating complex multi-planar fractures
Disadvantages of External Fixation
- Pins pose risks of complications like loosening, migration or breakage
- Pinsite injuries, pin-tract infections are relatively common
- Demands patient cooperation to prevent pin contamination during dressing
changes
- Fracture stabilization may not be as rigid as plate fixation in some cases
- Fixators require additional surgeries for implant removal once fracture heals
external fixators is a useful technique for temporary or definitive management
of fractures not amenable to internal fixation. Its minimally invasive,
adjustable and versatile nature offer benefits over traditional plating in
select clinical scenarios. With proper surgical skills and postoperative pin
care, external fixation provides an effective solution for complex orthopedic
injuries.
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