Ultrastructural anatomy of contracted capsules around textured implants in augmented breasts

Area of Science:

• Biomaterials Science
• Surgical Pathology
• Plastic Surgery

Background:

• Capsular contracture is a common complication following augmentation mammaplasty.
• The foreign body response leads to capsule development around implants.
• Understanding capsule architecture is crucial for mitigating complications.

Purpose of the Study:

• To investigate the fine architectural details of contracted capsules surrounding textured breast implants in humans.
• To compare the architecture of contracted capsules around textured versus smooth implants.
• To identify potential histological factors contributing to capsular contracture.

Main Methods:

• Light and scanning electron microscopy were used to examine eight human breast capsules from augmented, contracted breasts with textured silicone implants.
• Partial digestion with sodium hydroxide was employed for detailed structural analysis.
• Control samples included capsules from smooth implants and non-contracted textured implants.

Main Results:

• Contracted capsules exhibited a distinct multilayered structure with variations in collagen fiber arrangement across layers.
• The inner surface of the contracted capsule showed irregular, crater-like depressions.
• A thin vascular layer was observed near the inner surface of contracted capsules around textured implants.

Conclusions:

• The multilayered architecture suggests only specific layers contribute significantly to the contractile force.
• The identified vascular layer is hypothesized to be critical for the histological development and growth of the capsule.
• Textured implant surfaces may influence capsule contraction mechanisms through their interaction with this vascular layer.