During limb lengthening with an Ilizarov ring fixator for a tibial shortening, the standard protocol includes a latency phase before distraction begins. The recommended rate of distraction is:

• A 0.25 mm per day in a single step
• B 1 mm per day divided into four increments of 0.25 mm ✓
• C 2 mm per day divided into two increments
• D 5 mm per week in a single increment

Explanation

Ilizarov distraction osteogenesis follows a latency period of about 5 to 7 days after corticotomy, then distraction at approximately 1 mm per day, classically given as four quarter-millimetre turns. Faster rates produce poor regenerate formation and nerve stretch, while slower rates lead to premature consolidation. The microdistractions stimulate membranous ossification in the interposed fibrous zone, producing a radiographic regenerate column.

Reference: Bailey and Love's Short Practice of Surgery, 28th ed.

High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP

Written and medically reviewed by the StethoPrep medical team.