Basic fibroblast growth factor increases allograft incorporation. Bone chamber study in rats

Area of Science:

• Biomaterials Science
• Regenerative Medicine
• Orthopedic Research

Background:

• Bone allografts are used in skeletal reconstruction but face challenges with integration.
• Enhancing vascularization and new bone formation within allografts is crucial for successful outcomes.
• Basic fibroblast growth factor (bFGF) is a potent mitogen and angiogenic factor with potential in bone regeneration.

Purpose of the Study:

• To evaluate the effect of basic fibroblast growth factor (bFGF) pretreatment on new bone penetration into frozen bone allografts.
• To quantify the extent of bone ingrowth into allografts using a novel bone chamber model.
• To assess the impact of bFGF on the rate and extent of graft incorporation.

Main Methods:

• A rat tibial model utilizing newly designed titanium bone chambers was employed.
• Frozen bone allografts, pretreated with or without bFGF, were implanted bilaterally.
• Histological analysis was performed at 6 weeks to measure the distance of new bone penetration into the allografts.

Main Results:

• Pretreatment with bFGF resulted in a 51% increase in new bone penetration distance into the allografts at 6 weeks.
• Bone ingrowth in bFGF-treated specimens showed ongoing membranous ossification.
• Control grafts exhibited significantly less bone penetration, with further ingrowth nearly ceased.

Conclusions:

• Basic fibroblast growth factor (bFGF) significantly promotes new bone formation and penetration into frozen bone allografts.
• The findings suggest bFGF is a promising therapeutic agent for improving bone allograft integration.
• This study provides a quantitative model for assessing bone graft healing and the efficacy of growth factors.