F ijany et al 1 publish a systematic review and meta-analysis comparing complication rates between smooth and textured tissue expanders. The authors found no significant difference in complications such as seroma, hematoma, and marginal skin necrosis. However, they did find an increased risk of explantation for smooth tissue expanders, with an odds ratio of 1.53. The authors conclude that textured expanders are safe and "may lower the risk of early complications requiring explantation." Fijany et al 1 recommend that surgeons counsel their patients preoperatively that smooth expanders have an increased risk of explantation, whereas the risk of breast implant-associated anaplastic large-cell lymphoma (BIA-ALCL) is minimal when using textured expanders. They recommend further studies to define the relationship between tissue expanders and BIA-ALCL. These are important conclusions. Should plastic surgeons resume using textured tissue expanders?The authors selected 5 studies for inclusion in their meta-analysis. Four studies contained explantation data. 2-5 One of these studies, by Nelson et al, 5 reported a large experience at Memorial Sloan Kettering Cancer Center. This single study accounted for 67.7% of the expanders in the explantation meta-analysis. 1 Surprisingly, Fijany et al 1 included the raw data, as opposed to the propensity-matched data, from this study. 5 The authors of this large contributing study emphasized the importance of confounders in their comparison. 5 Tissue expanders inserted before the July 24, 2019, recall of Allergan Biocell textured devices (AbbVie, North Chicago, IL) were primarily textured (75.4% textured vs 24.6% smooth). Expanders inserted after the recall were almost exclusively smooth (0.7% textured vs 99.3% smooth). Significantly more patients who received smooth expanders had prior radiation (3.16% vs 1.35%, P = 0.007). A greater percentage of patients with smooth expanders underwent chemotherapy before surgery (36.7% vs 29.9%, P = 0.001), as opposed to postoperative chemotherapy. Smooth expanders were slightly larger (436 vs 406 mL, P < 0.001) and had higher initial fill volumes (215 vs 182 mL, P < 0.001). Prepectoral placement (32.8% vs 18.9%, P < 0.001) and acellular dermal matrix (46.2% vs 28.4%, P < 0.001) were used more frequently in the more recent group who received smooth expanders. 5 When considering explantation risk, all of these factors may be relevant 5 and favor patients treated with textured devices. Moreover, in any comparison using a historical control group, there is chronology bias. More recently treated patients are likely to have better outcomes for reasons that may be unrelated to the type of expander used. This is the reason the MINORS (Methodological Index for Non-Randomized Studies) scale favors concurrent rather than historical control groups in assigning point values. 6 In fact, a MINORS assessment would have been an asset for this review.Nelson et al 5 sought to account for these group differences by performing a propensity-matched subgroup analysis. T...