Orthonotes
by the.bonestories
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Tension‑stress effect: gradual distraction (≈1 mm/day in 4 steps) after corticotomy induces regenerate bone and soft‑tissue adaptation. Circular fixator with tensioned wires permits multiplanar stability and early weight bearing. Phases: latency (5–7 d), distraction, consolidation; rate/rhythm critical to regenerate quality. Indications: nonunion (infected), bone loss (transport), deformity correction, limb lengthening. Complications: pin site infection, joint contractures, poor regenerate, psychological burden.
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The Ilizarov technique is a method of limb reconstruction based on the principles of distraction osteogenesis. It was developed by the Russian orthopaedic surgeon Gavriil Ilizarov in the mid twentieth century. The technique allows gradual bone lengthening, deformity correction and treatment of complex nonunions using circular external fixation.
The Ilizarov apparatus consists of rings connected by rods with tensioned wires or half pins passing through bone. By gradually distracting the bone segments following a corticotomy, new bone formation occurs in the distraction gap while surrounding soft tissues adapt simultaneously.
The method has revolutionized management of difficult orthopaedic conditions such as limb length discrepancy, infected nonunion, bone loss, deformity correction and congenital limb deficiencies.
Gavriil Ilizarov introduced the technique in the 1950s while practicing in Kurgan, Russia. Initially the method was used to treat nonunions and bone defects. Over time it became widely adopted worldwide after its biological principles were recognized.
Ilizarov demonstrated that gradual mechanical tension applied to bone and soft tissue stimulates regeneration. This phenomenon was termed the law of tension stress.
| Component | Description | Function |
|---|---|---|
| Rings | Circular metal rings placed around limb | Provide structural framework |
| Tensioned wires | Thin wires passed through bone and tensioned | Secure fixation and stability |
| Half pins | Threaded pins inserted into bone | Additional fixation |
| Connecting rods | Rods connecting rings | Allow controlled distraction |
Distraction osteogenesis refers to the formation of new bone between two bone surfaces that are gradually separated. After performing a corticotomy, the bone segments are slowly distracted at a controlled rate.
New bone forms in the gap through intramembranous ossification while surrounding soft tissues including muscles, nerves, skin and blood vessels lengthen simultaneously.
| Phase | Description |
|---|---|
| Latency phase | Initial healing phase after corticotomy |
| Distraction phase | Gradual separation of bone segments |
| Consolidation phase | Mineralization and maturation of regenerate bone |
The Ilizarov method follows the principle known as the law of tension stress. According to this principle gradual and controlled mechanical distraction stimulates tissue regeneration.
| Step | Typical Value |
|---|---|
| Latency period | 5 to 7 days |
| Distraction rate | 1 millimeter per day |
| Distraction rhythm | 0.25 millimeter four times daily |
| Consolidation period | Approximately twice distraction time |
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