RT Journal Article SR Electronic T1 Alternative clinical trial designs JF Trauma Surgery & Acute Care Open JO Trauma Surg Acute Care Open FD BMJ Publishing Group Ltd SP e000420 DO 10.1136/tsaco-2019-000420 VO 5 IS 1 A1 John A Harvin A1 Ben L Zarzaur A1 Raminder Nirula A1 Benjamin T King A1 Ajai K Malhotra A1 , YR 2020 UL http://tsaco.bmj.com/content/5/1/e000420.abstract AB High-quality clinical trials are needed to advance the care of injured patients. Traditional randomized clinical trials in trauma have challenges in generating new knowledge due to many issues, including logistical difficulties performing individual randomization, unclear pretrial estimates of treatment effect leading to often unpowered studies, and difficulty assessing the generalizability of an intervention given the heterogeneity of both patients and trauma centers. In this review, we discuss alternative clinical trial designs that can address some of these difficulties. These include pragmatic trials, cluster randomization, cluster randomized stepped wedge designs, factorial trials, and adaptive designs. Additionally, we discuss how Bayesian methods of inference may provide more knowledge to trauma and acute care surgeons compared with traditional, frequentist methods.