Nonunion & Bone Transport — Ilizarov

Nonunion refers to failure of a fracture to heal within an expected time frame and without further surgical intervention. It is a significant complication in orthopaedic trauma and may result in pain, deformity, limb shortening, and functional disability. Management of nonunion depends on the underlying cause and may involve biological stimulation, mechanical stabilization, or reconstruction techniques.

The Ilizarov method is a revolutionary technique used for treating complex nonunions, bone defects, deformities, and limb length discrepancies. Developed by the Russian orthopaedic surgeon Gavriil Ilizarov, this method uses circular external fixation and controlled distraction osteogenesis to regenerate bone and soft tissues.

Bone transport using the Ilizarov technique is particularly useful in cases of infected nonunion and large segmental bone defects where conventional fixation methods are inadequate.

Nonunion is defined as failure of fracture healing after an adequate period of time, typically 6–9 months, with no evidence of progressive healing on radiographs for at least 3 months.

• Persistent fracture gap
• Absence of callus formation
• Pain and instability at fracture site
• Failure of healing without intervention

Several biological and mechanical factors contribute to the development of nonunion.

• Inadequate stabilization
• Infection at fracture site
• Poor blood supply
• Large fracture gap
• Severe soft tissue injury
• Patient factors such as smoking or malnutrition

The Ilizarov technique is based on the principle of distraction osteogenesis. Controlled mechanical distraction stimulates new bone formation in the gap created by gradual separation of bone segments.

• Circular external fixator
• Transosseous tensioned wires
• Gradual distraction of bone segments
• Regeneration of bone and soft tissues

Bone transport is a technique used to reconstruct large bone defects. A segment of bone is gradually moved across the defect while new bone forms in the distraction gap.

• Corticotomy performed away from defect
• Bone segment gradually transported
• Regenerate bone forms behind transport segment
• Defect eventually filled with new bone

• Infected nonunion
• Large bone defects
• Limb length discrepancy
• Congenital deformities
• Complex fractures with bone loss

• Simultaneous treatment of infection and bone defect
• Gradual correction of deformity
• Allows weight bearing during treatment
• Preserves blood supply to bone

• Pin tract infection
• Joint stiffness
• Delayed consolidation
• Malalignment
• Patient discomfort

• Ilizarov technique based on distraction osteogenesis
• Bone transport used for large bone defects
• Circular external fixator is key component
• Weight bearing often allowed during treatment