Figure 18. Histological sections of all treatment groups 6 weeks after surgery (left: overview indicating the cortical and central defect zone, rare case of overgrowing new bone formation above the cortical defect zone outside the defect; right: detailed descriptions): Autograft group (detailed description of the cortical defect zone (red rectangle): yellow arrows: newly formed bone (royalblue); red arrows: former cortical bone (purple); orange: borderline between newly formed bone and the former cortical bone).