Does the Textured-Type Tissue Expander Affect the Outcomes of Two-Stage Prosthetic Breast Reconstruction? A Propensity Score Matching Analysis between Macrotextured and Microtextured Expanders.

BACKGROUND In two-stage prosthetic breast reconstruction, two types of tissue expanders are used for the first stage: microtextured Siltex and macrotextured Biocell. Despite emerging concerns regarding the safety of macrotextured prostheses, the association between the use of macrotextured expanders and adverse outcomes remains unknown clinically. This study aimed to evaluate potential impacts of the type of tissue expander on the long-term outcomes of implant-based breast reconstruction. METHODS Patients who underwent immediate two-stage tissue expander/implant breast reconstruction between 2014 and 2018 were evaluated and categorized into two groups according to the expander type. Those two were propensity score matched for baseline characteristics and compared for complication rates after the first- and second-stage operations. The impacts of several variables, including type of tissue expander used, on outcomes were assessed using multivariable logistic regression analyses. RESULTS Of the 1391 cases in 1294 patients, 276 pairs (552 cases) were successfully propensity score matched. In the first-stage operation, the macrotextured group showed a significantly shorter drain indwelling period and lower rate of seroma than the microtextured group. These differences retained influences after adjusting for other variables. Incidence rates of other complications were similar between the groups. Regarding the second-stage operation, the use of macrotextured expanders showed a significant association, with an increased rate of severe capsular contracture on the multivariable analyses in cases using textured implants. Development of other complications was not affected by the expander type. CONCLUSION The type of tissue expander might influence the outcomes of two-stage implant-based breast reconstruction, and generally acceptable safety of both microtextured and macrotextured expanders was shown. CLINICAL QUESTION/LEVEL OF EVIDENCE Therapeutic, III.