New method of fixation of in-bone implanted prosthesis

Area of Science:

• Biomaterials Science
• Orthopedic Surgery
• Regenerative Medicine

Background:

• Direct skeletal attachment of limb prostheses aims to improve function and comfort.
• Current methods often involve implantation into the medullary canal, which has limitations.
• A novel skin and bone integrated pylon (SBIP) design offers potential for enhanced bone integration.

Purpose of the Study:

• To evaluate the preclinical effectiveness of a new version of the titanium porous composite SBIP (SBIP-3) for direct skeletal attachment.
• To assess the bone-implant interface and tissue response to the SBIP-3 design.

Main Methods:

• SBIP-3, featuring adjustable side fins for improved bone bonding, was implanted into the hind leg residuum of three rabbits.
• Histopathological analysis was performed after 13 or 26 weeks post-implantation.
• Evaluation focused on tissue ingrowth, bone formation, and inflammatory response.

Main Results:

• Histopathological analysis revealed successful integration, with fibrovascular tissue and woven bone filling the space between the SBIP-3 fins and the bone.
• No substantial inflammation was observed around the implant.
• The design facilitated a robust bond between the bone and the pylon.

Conclusions:

• The SBIP-3 demonstrates potential for effective direct skeletal attachment of limb prostheses.
• The novel fin design promotes bone integration and minimizes adverse inflammatory reactions.
• Further studies are warranted to validate these findings as a potential alternative to established techniques.