Efficacy of Partial- Versus Full-Sling Acellular Dermal Matrix Use in Implant-Based Breast Reconstruction: A Head-to-Head Comparison.

Background: Acellular dermal matrix (ADM), popularly used in tissue expander-based breast reconstruction, is applied either as a partial or full sling, but without any consensus regarding which method of application produces better outcomes. We aimed to compare the outcomes between two patient groups who underwent tissue expander-based breast reconstruction using these techniques.
Methods: A retrospective review was conducted for consecutive patients who underwent immediate two-stage implant-based breast reconstruction using ADM between January 2013 and June 2016. They were categorized into two cohorts: cohort 1 included patients in whom ADM was applied using the partial-sling technique, insetting it obliquely after releasing the pectoralis major muscle from its costal origin, and cohort 2 included those who underwent a full-sling technique, insetting it transversely after releasing the muscle from its costal and lower sternal origin. Postoperative complications and aesthetic outcomes were compared between the two groups.
Results: We analysed 329 cases (167 in cohort 1 and 162 in cohort 2) with similar baseline characteristics in both cohorts. Reconstruction failure occurred in 2.4% of overall patients. The rates of each and overall acute complications did not differ significantly between the cohorts. Cohort 2 showed significantly lower rates of tissue expander displacement and malposition following the first-stage operation and rippling following the second-stage operation, differences that retained the influences in multivariate analyses. Higher aesthetic scores were obtained in cohort 2.
Conclusion: Using the full-sling ADM might reduce unintended migration of prostheses and enable proper tissue expansion, resulting in better overall outcomes without increasing morbidities.
Level of Evidence Iii: This journal requires that authors assign a level of evidence to each article. For a full description of these Evidence-Based Medicine ratings, please refer to the Table of Contents or the online Instructions to Authors www.springer.com/00266 .