Comprehensive Review of Adipose Stem Cells and Their Implication in Distraction Osteogenesis and Bone Regeneration

Figure 7

Representation of callus classification. Illustration and radiographs demonstrate the modified Li classification of callus shape in distraction osteogenesis. (a) New bone formation in the distraction gap extends beyond the outer borders of the cortical bone. (b) New bone formation toward one side of the distraction gap with extension beyond the outer borders of the adjacent cortical bone. (c) New bone formation within the distraction gap with margins parallel to the adjacent cortical bone. (d) Biconcave-shaped new bone formation within the distraction gap. (e) New bone formation limited to one side of the bone without extension beyond the outer borders of the cortical bone. (f) New bone formation in the center with limited new bone regeneration in the lateral portion of the distraction gap. (g) Only speckled bone formation is present (bar scale = 5 cm).

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