Fixator

A fixator is a medical device used to stabilize bone segments in order to promote healing after fracture, osteotomy, or deformity correction. In orthopedics, fixation devices can be applied externally or internally. The term external fixator most commonly describes a frame that remains outside the body and holds pins or wires inserted into bone.

External fixators consist of pins or wires that pass through bone and are connected by external rings, frames, or bars. Common configurations include unilateral fixators, circular (ring) fixators such as the Ilizarov apparatus, and hybrid frames combining elements of both. Components may include pins or wires, clamps, rods or rings, and adjustment mechanisms that allow alignment, compression, or distraction of bone segments. The Taylor Spatial Frame is a modern, computer-assisted circular fixator.

Indications for external fixation include complex or open fractures, damage-control stabilization, limb length discrepancy, deformity correction, and staged reconstruction in soft-tissue injury. It is often chosen when soft tissue conditions or patient factors make internal fixation unsafe or impractical. Internal fixation devices, by contrast, are implanted inside the body during surgery.

Procedure and care: placement is performed under anesthesia with image guidance. After application, regular follow-up imaging guides adjustments to achieve alignment or lengthening. Pin site care is essential to reduce infection risk; patients may need physical therapy for joint mobility and early mobilization. Potential complications include pin tract infections, malalignment or loss of reduction, nonunion, and joint stiffness.

History and development: external fixators were refined by Gavriil Ilizarov in the 1950s, enabling distraction osteogenesis and limb-lengthening procedures. Since then, fixed-ring circular devices, unilateral frames, and hybrid systems have evolved, with advances in materials, dynamics, and computer-assisted planning.