Ilizarov's 1990 paper translates 40 years of experimental and clinical work into the foundational biological and technical principles of distraction osteogenesis. Using a canine tibia model, it systematically isolates the effects of fixation stability, marrow preservation, distraction rate, and distraction frequency on new bone formation. It then applies these findings to clinical limb lengthening, deformity correction, and treatment of skeletal dysplasias.
The 1 mm/day distraction rate is the number every resident must own. It is not a convention — it is the experimentally derived threshold at which tension-stress activates intramembranous osteogenesis without causing tissue necrosis or premature consolidation.
When you manage a patient on an Ilizarov frame or a PRECICE intramedullary nail, three variables govern bone quality: distraction rate (1 mm/day), fractionation (minimum 4 steps/day, ideally continuous), and a consolidation period at least as long as the distraction period. Shortcutting any of these is why regenerate bone fails.
Preserving marrow blood supply at the time of corticotomy is equally non-negotiable. A low-energy percutaneous corticotomy is biologically superior to an open osteotomy. Not because of soft-tissue handling, but because the medullary vasculature is the substrate for everything that follows.
Spondyloepiphyseal dysplasia is the canonical contraindication to lengthening. When a patient with skeletal dysplasia is referred for stature correction, joint morphology determines candidacy. Not just leg length discrepancy.
Ilizarov's 1990 paper translates 40 years of experimental and clinical work into the foundational biological and technical principles of distraction osteogenesis. Using a canine tibia model, it systematically isolates the effects of fixation stability, marrow preservation, distraction rate, and distraction frequency on new bone formation. It then applies these findings to clinical limb lengthening, deformity correction, and treatment of skeletal dysplasias.
The 1 mm/day distraction rate is the number every resident must own. It is not a convention — it is the experimentally derived threshold at which tension-stress activates intramembranous osteogenesis without causing tissue necrosis or premature consolidation.
When you manage a patient on an Ilizarov frame or a PRECICE intramedullary nail, three variables govern bone quality: distraction rate (1 mm/day), fractionation (minimum 4 steps/day, ideally continuous), and a consolidation period at least as long as the distraction period. Shortcutting any of these is why regenerate bone fails.
Preserving marrow blood supply at the time of corticotomy is equally non-negotiable. A low-energy percutaneous corticotomy is biologically superior to an open osteotomy. Not because of soft-tissue handling, but because the medullary vasculature is the substrate for everything that follows.
Spondyloepiphyseal dysplasia is the canonical contraindication to lengthening. When a patient with skeletal dysplasia is referred for stature correction, joint morphology determines candidacy. Not just leg length discrepancy.