Introduction
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Callotasis is a gradual stretching of the reparative callus that forms around bone segments interrupted by osteotomy or fracture. Clinically, callotasis consists of three sequential periods: 1) latency, 2) distraction, and 3) consolidation. Latency is the period from bone division to the onset of traction and is the time required for callus formation. The distraction period is the time when gradual traction is applied and new bone, or distraction regenerate, is formed. The consolidation period allows maturation and corticalization of the regenerate after traction forces are discontinued (Gantous et al., 1994; Murray & Fitch, 1996).

FIG. 1.11-1.13. Radiographs of a dog mandible during 10 mm of bilateral mandibular lengthening by distraction osteogenesis: latency period (left), distraction period (center), and consolidation period (right).

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