Alternatives to autograft evaluated in a rabbit segmental bone defect

Current treatment of bone defects often requires multiple procedures or extended healing times. Prior research has shown that autografts remain the gold standard for bone regeneration, but they come with donor site morbidity. This gap motivated the exploration of same-day alternatives using commercial scaffolds. No prior work had resolved how different scaffold and cell combinations affect healing outcomes. The need for single-session strategies is high in clinical settings. Bone marrow aspirate has been used to enhance grafts, but its concentrated form may offer additional benefits. Radiographic and histological assessments are standard for evaluating bone repair. This paper's contribution lies in comparing scaffold-cell combinations in a rabbit model.

The goal was to evaluate same-day treatment options for bone defects that avoid autografts. Researchers aimed to compare two scaffold types—demineralized bone matrix and a collagen/beta-tricalcium phosphate composite. They also tested the effect of using either bone marrow aspirate or its concentrated form. The study focused on whether scaffold-cell combinations could promote healing in a rabbit radius defect model. Radiographic and histological data were used to assess outcomes. The motivation was to find a reliable alternative to autografts that can be applied in a single surgical session. No prior work had directly compared these scaffold-cell combinations in this specific model. The results could guide clinical choices for bone defect repair.

The study used forty New Zealand white rabbits with unilateral radius defects measuring 15 mm. Each defect was treated with one of four scaffold-cell combinations: demineralized bone matrix with bone marrow aspirate, demineralized bone matrix with concentrated bone marrow aspirate, collagen/beta-tricalcium phosphate with bone marrow aspirate, or collagen/beta-tricalcium phosphate with concentrated bone marrow aspirate. Bone regeneration was evaluated using radiographic and histological methods. Cell concentration, colony-forming unit counts, and platelet levels were measured in the bone marrow aspirate samples. Defect bridging and bone formation were assessed through imaging techniques. The study followed a controlled experimental design to compare healing outcomes. No prior work had used this specific combination of scaffolds and cell types in this model.

The concentration of nucleated cells and colony-forming unit-fibroblasts increased in concentrated bone marrow aspirate compared to standard bone marrow aspirate (p < 0.05). Platelet concentration also increased while haematocrit decreased in concentrated bone marrow aspirate. Radiographic analysis showed greater bone regeneration in defects treated with demineralized bone matrix scaffolds compared to collagen/beta-tricalcium phosphate scaffolds. Defect bridging was significantly improved with demineralized bone matrix grafts. The collagen/beta-tricalcium phosphate scaffolds showed better healing when combined with concentrated bone marrow aspirate. Histological findings supported the radiographic results. The study found that scaffold-cell combinations can promote healing in a single surgical session. These findings suggest that scaffold-cell combinations may be viable alternatives to autografts.

The authors propose that scaffolds containing demineralized bone matrix or collagen/beta-tricalcium phosphate combined with bone marrow aspirate or its concentrated form are effective same-day strategies for bone defect treatment. The study found that demineralized bone matrix grafts led to greater bone regeneration than collagen/beta-tricalcium phosphate grafts. The collagen/beta-tricalcium phosphate scaffolds showed improved healing when augmented with concentrated bone marrow aspirate. These findings suggest that scaffold-cell combinations may be viable alternatives to autografts. The authors suggest that concentrated bone marrow aspirate may enhance healing outcomes. The study supports the use of these strategies in clinical settings. No prior work had directly compared these scaffold-cell combinations in this model. The results may guide future clinical decisions in bone defect repair.