Decellularized vascularized bone grafts as therapeutic solution for bone reconstruction: A mechanical evaluation

Area of Science:

• Biomaterials Science
• Orthopedic Surgery
• Tissue Engineering

Background:

• Large bone defects pose significant surgical challenges.
• Current bone graft substitutes often fail to achieve optimal long-term function and osteointegration.
• Perfusion-decellularized bone substitutes offer a promising alternative to address these limitations.

Purpose of the Study:

• To evaluate the biomechanical properties of bone substitutes created using different decellularization techniques.
• To compare the mechanical performance of decellularized bone with native bone.
• To determine the impact of decellularization methods on bone graft integrity.

Main Methods:

• Two decellularization protocols were employed: Sodium Dodecyl Sulfate (SDS) and NaOH with H2O2.
• Decellularization was performed on porcine forearms.
• Biomechanical testing included compression, three-point bending, indentation, and screw pull-out tests.

Main Results:

• The NaOH protocol (D2) significantly enhanced biomechanical strength, showing marked improvements in screw pull-out (+40.7%) and three-point bending (+39.2%) compared to native bone.
• The SDS protocol (D1) demonstrated comparable results to native bone across most tests, with minor variations in pull-out, compression, bending, and indentation.
• Compression and indentation tests yielded similar results across all tested samples, regardless of the decellularization method.

Conclusions:

• Decellularization methods significantly influence the biomechanical outcomes of bone substitutes.
• The NaOH-based decellularization protocol shows potential for preserving and enhancing bone graft mechanical integrity.
• Optimized decellularization techniques are crucial for developing effective bone substitutes for reconstruction.