The In Vivo Pericapsular Tissue Response to Modern Polyurethane Breast Implants

Area of Science:

• Plastic Surgery
• Biomaterials Science
• Histology

Background:

• Polyurethane breast implants were developed to mitigate issues like capsular contracture and gel bleed associated with traditional silicone implants.
• Early polyurethane implants faced sterilization challenges, but modern ethylene oxide (ETO) sterilization has reduced biofilm incidence.
• Polyurethane's surface properties promote bio-integration and have been linked to lower rates of displacement, seroma, and rupture.

Purpose of the Study:

• To histologically evaluate the tissue response to polyurethane-covered cohesive gel silicone breast implants.
• To investigate the long-term safety and efficacy of polyurethane implants in reducing complications.
• To analyze the development of the breast capsule around polyurethane implants over time.

Main Methods:

• Histological examination of breast capsules from three patients with polyurethane implants (few months to over 3 years post-implantation).
• Inclusion of histological data from polyurethane implants in situ for 15 and 20 years.
• Analysis of capsule layers and their formation in relation to the polyurethane implant.

Main Results:

• Five distinct layers were identified in the breast capsule surrounding polyurethane implants.
• Polyurethane material becomes nearly undetectable after 20 years, with capsular contracture potentially developing later.
• A significant reduction in clinical capsular contracture rates was observed up to 10 years compared to silicone implants.

Conclusions:

• Polyurethane-covered implants show promising results in reducing common complications associated with breast implants.
• The bio-integrative properties and matrix formation contribute to implant safety and reduced capsular contracture.
• Further research into permanent matrix materials like polyurethane may offer solutions for long-term capsular contracture prevention.