[Massive allografts cold-preserved and radiation-sterilized]

Area of Science:

• Orthopedic Surgery
• Biomaterials Science
• Oncology

Background:

• Massive bone allografts are utilized in orthopedic reconstructions.
• Sterilization methods are crucial for allograft safety and efficacy.
• Irradiation sterilization offers a method to reduce infection risk.

Purpose of the Study:

• To evaluate the outcomes of massive bone allografts.
• To assess the efficacy of Beta irradiation sterilization.
• To analyze bone union and revascularization rates.

Main Methods:

• Thirty massive bone allografts (7-30 cm) were implanted.
• Allografts were frozen at -30°C and sterilized by Beta irradiation (2.5-3.5 megarads).
• Grafts were used for tumor resection, non-union, prosthesis removal, stability restoration, and mobility preservation.

Main Results:

• No post-operative infections were observed.
• Bone union occurred in 26/30 diaphyseal-graft junctions and 8/9 epiphyseal-graft junctions.
• Scintigraphy indicated revascularization starting at three months, facilitated by muscle reattachment.

Conclusions:

• Beta irradiation sterilization is effective in preventing infection in massive bone allografts.
• Massive bone allografts demonstrate good potential for bone union and revascularization.
• Allografts can successfully restore stability and preserve mobility in orthopedic reconstructions.