Lipid extracted bank bone. Bone conductive and mechanical properties

Area of Science:

• Orthopedic Surgery
• Biomaterials Science
• Immunology

Background:

• Lipid extraction via chloroform-methanol enhances frozen bone allograft incorporation.
• This enhancement is potentially linked to a reduced immunologic response.

Purpose of the Study:

• To investigate the bone ingrowth capacity of defatted versus frozen allografts in a rabbit model.
• To compare defatted allografts with autografts and assess the immunologic influence on graft incorporation.

Main Methods:

• Utilized the rabbit bone harvest chamber model for evaluating graft incorporation.
• Employed histology, histomorphometry, and 99mTc-MDP scintimetry for quantitative and qualitative analysis.
• Performed biomechanical compression tests on defatted and frozen bone cylinders.

Main Results:

• Defatted allografts demonstrated superior incorporation, with earlier mesenchymal tissue filling and new bone formation compared to frozen allografts.
• Histomorphometry revealed increased new bone and graft resorption in defatted allografts.
• Scintimetry indicated higher activity in defatted allografts at 3 weeks, suggesting enhanced remodeling and potential detrimental immunologic effects on frozen allografts.
• No significant differences were observed between defatted autografts and allografts, nor in the biomechanical properties of defatted versus frozen bone.

Conclusions:

• Lipid extraction significantly improves bone allograft incorporation compared to non-defatted grafts.
• Defatting bone allografts enhances integration without compromising biomechanical integrity.
• Findings suggest a detrimental immunologic influence on frozen allografts, highlighting lipid extraction as a beneficial preparation method.