Expander prosthesis and DIEP flaps in delayed breast reconstruction: Sensibility, patient-reported outcome, and complications in a five-year randomised follow-up study.

Breast reconstruction is a given choice for many women following mastectomy. There are a multitude of methods available today, and thus, comparative studies are essential to match patients with suitable methods. The aim of this study was to compare 5-year outcomes following delayed breast reconstruction with expander prosthesis (EP) and with deep inferior epigastric perforator (DIEP) flaps. Seventy-three patients, previously randomised to either a permanent EP or a DIEP flap breast reconstruction, were invited for a 5-year follow-up. Assessments included symmetry measurements, breast sensibility with Semmes-Weinstein monofilaments and patient-reported outcome (PRO) with the BREAST-Q. Complications within the first 5 postoperative years were recorded. Additionally, BREAST-Q questionnaires were collected from non-randomised patients with an EP breast reconstruction. Between 2019 and 2022, 65 patients completed the follow-ups. Symmetry and PRO were significantly higher in the DIEP flap group. However, EP-reconstructed breasts were significantly more sensate and demonstrated areas with protective sensibility, unlike the DIEP flap breasts. The overall complication rates were comparable between the two groups (p = 0.27). Regression analysis identified body mass index as a risk factor for reoperation in general anaesthesia and for wound infection. No significant differences were found in a comparison of the randomised and the non-randomised EP groups' BREAST-Q results. This randomised 5-year follow-up study found PRO to be favourable following a DIEP flap reconstruction and sensibility to be better in EP reconstructions. The complication rates were comparable; however, longer follow-ups are warranted to cover the complete lifespans of the two breast reconstruction methods.