Polyurethane foam-covered implants and capsular contracture: a laboratory investigation

Area of Science:

• Biomaterials Science
• Surgical Innovation
• Medical Device Research

Background:

• Capsular contracture is a common complication following breast augmentation.
• Polyurethane foam coating is used on implants to potentially reduce capsular contracture.
• Objective assessment of implant coatings is crucial for understanding their efficacy.

Purpose of the Study:

• To compare the incidence and severity of capsular contracture between polyurethane foam-covered and smooth silicone gel implants.
• To evaluate the safety profile of foam-covered implants, specifically looking for hematoma or foam separation in cases of severe contracture.

Main Methods:

• Experiments were conducted using rabbit models.
• Five objective measurement methods were employed to assess capsular contracture.
• Comparison was made between polyurethane foam-covered implants and identical smooth silicone gel implants.

Main Results:

• No statistically significant difference in capsular contracture was identified between the two implant types.
• Foam-covered implants did develop capsular contracture, predominantly of mild clinical significance.
• Severe contractures in foam-covered implants showed no evidence of associated hematoma or foam separation.

Conclusions:

• Polyurethane foam coating did not significantly prevent capsular contracture compared to smooth implants in this rabbit model.
• The observed contractures with foam implants were generally mild and clinically insignificant.
• Foam-covered implants appear safe in terms of hematoma and foam integrity, even with contracture.