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Effect of Early Weight Bearing on Outcomes After Open Reduction and Internal Fixation of Trimalleolar Ankle Fractures.

Current practice allows early weight bearing of unstable ankle fractures after fixation. This study offers a unique comparison of early weight bearing (EWB) vs late weight bearing (LWB) in operatively stabilized trimalleolar ankle fractures. The goal of this study was to evaluate union rates, clinical outcomes, and complications for patients who were managed with EWB vs LWB. The authors performed a retrospective review of 185 patients who underwent surgical stabilization for trimalleolar ankle fracture. Fixation of the posterior malleolus and weight bearing status were determined by surgeon preference. For this study, EWB was defined as 3 weeks or less and LWB was defined as greater than 3 weeks. Patients were evaluated for fracture union and implant failure. Complications and clinical outcomes included ambulatory status, infection rate, and return to surgery. The EWB group included 47 (25.4%) patients, and the LWB group included 138 (74.6%) patients. Of the 7 non-unions, 1 (14.3%) occurred in the EWB group and 6 (85.7%) in the LWB group. A total of 72 (38.9%) posterior malleolar fractures were operatively stabilized, and stabilization did not affect union rates. Syndesmotic fixation was required for 12.5% of patients, despite posterior malleolar stabilization. Syndesmotic fixation increased the union rate 2.5 times. Deep infection and open fracture decreased union. No difference was seen between groups in implant failure, union rate, infection, or return to the operating room. No deleterious effect of EWB in operatively treated trimalleolar ankle fractures was found for union, implant failure, infection, or reoperation. Syndesmotic fixation may offer an advantage over posterior malleolar fixation, with improved union rates. [Orthopedics. 2021;44(x):xx-xx.].