Histopathological Analysis of Adipose-Derived Mesenchymal Stem Cells and Their Osteogenic Derivatives in Promoting Bone Regeneration in a Model of Fracture Nonunion.

Several human studies show positive signals, while research methods and sample sizes continue to develop.

• Level A · Stronger Clinical Evidence
• Level B · Emerging clinical evidence with positive signals
• Level C · Early human research exploring benefits
• Level D · Scientific groundwork from lab and animal studies
• Emerging · Emerging topic under active research

Abstract (original English)

Objective To perform a histopathological analysis of the effects of mesenchymal stem cells (MSCs) and their osteogenically differentiated derivatives (Dif-MSCs) on reparative processes in bone tissue using an experimental model of fracture nonunion. Subjects and methods Fifteen male rabbits aged 3 months were randomly assigned to three groups: control with induced femoral nonunion (n = 5), nonunion treated with adipose-derived MSCs (n = 5), and nonunion treated with Dif-MSCs (n = 5). MSCs were isolated from lipoaspirate, cultured to passage 3, and differentiated osteogenically for 4 weeks. A 5-mm bone defect was created surgically, and cells were injected into the defect zone on day 7. Animals were euthanized at 6 weeks postinjection. Bone specimens underwent fixation, decalcification, histological staining (hematoxylin-eosin and Van Gieson), and quantitative analysis of osteoblasts and osteocytes using ImageJ. Statistical analysis included one-way ANOVA and Welch's t test. Results Macroscopic and histological evaluation revealed a gradation in regeneration: control group showed predominant fibrous tissue with immature bone and inflammation; MSCs group exhibited fibrocartilaginous callus with immature bone, bone marrow formation, and increased osteoblasts (52.0 ± 16.2 per 10 HPF vs. control 28.6 ± 7.0, p = 0.032); Dif-MSCs group demonstrated mature lamellar bone, organized oste

Evidence level

Several human studies show positive signals, while research methods and sample sizes continue to develop.

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