Implant Size Versus Mastectomy Weight in Breast Reconstruction: Does Matching Matter?

Area of Science:

• Plastic Surgery
• Breast Reconstruction
• Oncologic Surgery

Background:

• Nipple-sparing mastectomy with direct-to-implant reconstruction can result in dead space due to volumetric mismatch.
• This mismatch occurs when the implant size is smaller than the mastectomy specimen removed.

Purpose of the Study:

• To evaluate the impact of volumetric mismatch between implant size and mastectomy weight on postoperative complications.
• To identify predictors of complications in direct-to-implant breast reconstruction.

Main Methods:

• A multicenter retrospective cohort study of 1031 patients undergoing nipple-sparing mastectomy with direct-to-implant reconstruction.
• Volumetric mismatch calculated as mastectomy weight (g) minus implant size (mL).
• Receiver operating characteristic and multivariable regression analyses used to assess complication rates.

Main Results:

• A total of 1617 breast reconstructions were analyzed with a mean follow-up of 25.3 months.
• A volumetric mismatch of ≥78 g/mL was associated with significantly higher rates of complications (14.6% vs 6.4%), infection (4.5% vs 1.6%), and seroma (6.9% vs 1.9%).
• Volumetric mismatch, smoking, and age were significant predictors of any complication.

Conclusions:

• A greater volumetric mismatch between implant size and mastectomy weight is a significant predictor of postoperative complications, including explantation.
• Matching implant size more closely to mastectomy weight may reduce complications.
• Consideration of skin-sparing mastectomies or techniques to minimize dead space is recommended.