BACKGROUND: While the majority of proximal humerus fractures (PHFs) can be managed conservatively, for some, particularly complex 3- or 4-part fractures, management is controversial. The decision-making process can be challenging, especially in older patients when considering whether secondary surgery for failed nonoperative management comes with more risk than acute surgical treatment. There is limited evidence in the literature that compares the outcomes of patients having an acute reverse shoulder arthroplasty (rTSA) for trauma vs. those having an rTSA for trauma sequalae following failed previous conservative management. This study aims to use the National Joint Registry (NJR) and Hospital Episode Statistics for England to compare outcomes of rTSA for acute trauma vs. those of rTSA for trauma sequalae following failed conservative management. METHODS: NJR data from April 2012 to March 2022 were linked to Hospital Episode Statistics. All patients undergoing an rTSA for acute or trauma sequalae were included. The primary outcome was revision. Secondary outcomes were nonrevision reoperation, mortality, medical complications within 30 and 90 days of primary procedure, and length of stay. RESULTS: In the propensity-matched cohorts, there were 2,488 patients in the acute trauma group and 1,267 patients in the trauma sequalae group. rTSA for trauma sequalae had a higher cumulative revision rate at 1, 3, 5, 7, and 10 years and a statistically significant increased risk in overall revision (hazard ratio = 2.44 (1.68-3.55; P < .001) in comparison to acute trauma rTSA. There was no statistical difference in the incidence of nonrevision reoperation (P = .17). At 1 year, the mortality rate was 4.11% (3.38-5.00) for acute trauma and 3.07% (2.23-4.23) for trauma sequalae, and this was not statistically different (hazard ratio = 0.74 [0.51-1.09], P = .13). In the acute trauma group, there was a statistically significant increase in medical complications at 30 and 90 days postprocedure, as well as a longer length of stay (P < .001). CONCLUSION: Based on this NJR analysis, patients are twice as likely to require a revision surgery if they undergo rTSA after conservative management has failed, compared to those who receive the procedure immediately following a proximal humerus fracture. While this may inform decision-making and the consent process, given some of the limitations around registry analysis, the findings underline the importance of well-designed prospective trials in establishing the optimal timing of surgery.