Regarding the Ilizarov technique of distraction osteogenesis for limb lengthening, which statement is correct?

• A Distraction begins immediately after corticotomy at a rate of 2 mm per day
• B Consolidation phase duration is independent of the length gained
• C The corticotomy must preserve the medullary canal intact to allow endosteal healing
• D After a latency period of about 5 to 7 days, distraction proceeds at approximately 1 mm per day divided into small increments ✓

Explanation

Ilizarov distraction osteogenesis follows a latency phase of roughly 5 to 7 days after corticotomy, then distraction at about 1 mm per day, ideally split into four 0.25 mm increments, which favours intramembranous bone formation in the regenerate. Immediate rapid distraction risks poor regenerate formation. The corticotomy intentionally preserves medullary blood supply, making option C wrong in intent, and consolidation time is proportional to the length gained.

Reference: Apley and Solomon's Concise System of Orthopaedics and Trauma, 10th ed.

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