Biocompatibility, bone healing, and safety evaluation in rabbits with an IlluminOss bone stabilization system

Area of Science:

• Orthopaedic Research
• Biomaterials Science
• Surgical Innovation

Background:

• The IlluminOss System (IS) utilizes an inflatable balloon with photopolymerizable liquid monomer for fracture stabilization.
• Evaluating the bone healing, biocompatibility, and safety of the IS is crucial for its clinical application.

Purpose of the Study:

• To assess the efficacy of the IlluminOss System in promoting bone healing and remodeling.
• To evaluate the biocompatibility and safety profile of the IS in a preclinical model.
• To investigate the consequences of simulated clinical failures with the IS.

Main Methods:

• The study employed New Zealand white rabbits with IS implants in fenestrated femoral cortices.
• Radiological and histological analyses were used to evaluate bone healing and callus remodeling over 6 months.
• Biocompatibility was assessed by implanting IS in intramedullary spaces and comparing with K-wires up to 1 year.
• Simulated clinical failures involving liquid or polymerized monomer were analyzed for safety.

Main Results:

• Successful bone healing and callus remodeling were observed radiologically and histologically.
• IS implants demonstrated excellent biocompatibility, with no adverse local or systemic responses, comparable to K-wires.
• Simulated failures showed that polymerized material had effects similar to mechanical disruption; high monomer doses caused necrosis.

Conclusions:

• The IlluminOss System, when polymerized within bone, appears to be a safe and effective method for fracture stabilization.
• The IS exhibits favorable biocompatibility and promotes bone healing and remodeling.
• Understanding potential failure modes is important for ensuring patient safety.