BackgroundTraumatic Brain Injury (TBI) is a major cause of physical disabilities worldwide. Herein, we aimed to investigate the factors contributing to post-discharge recovery in patients who were discharged with an unfavorable outcome. MethodsWe collected data on the characteristics of patients, with a focus on those who survived TBI but had an unfavorable outcome at discharge as measured by Glasgow Outcome Scale Extended; GOSE categories two, three, and four. Post-discharge recovery was defined as achieving a favorable functional status at six months (GOSE of five or more) with a minimum two-point increase in GOSE. ResultsOf 4011 TBI patients in our registry, 797 had an unfavorable discharge functional status. In severe TBI, 51% achieved recovery, while in mild to moderate TBI, 57% achieved recovery after six months. Older patients and those with shorter intensive care unit length of stay were more likely to experience post-discharge recovery in both mild to moderate and severe TBI groups. The presence of base of skull fracture was also associated with post-discharge recovery in severe TBI patients. Lastly, we showed that, after adjustment for potential confounders, GOSE at discharge is associated with post-discharge recovery in both mild to moderate and severe TBI patients. ConclusionThis study found that the majority of the patients who were discharged with an unfavorable functional status were able to achieve a favorable outcome within six months. The novel post-discharge recovery in TBI patients might be a useful toll for illuminating the factors associated with a significant improvement after discharge.