Management of complex proximal humerus fractures in older adults remains controversial because bone quality, tuberosity involvement and rotator-cuff function all influence the result. In this prospective randomized trial, adults aged 80 years or older with displaced three- or four-part proximal humeral fractures were assigned to reverse shoulder arthroplasty or nonoperative treatment. The study directly addressed a clinically important question: whether replacing the joint can provide better pain relief and function than accepting fracture healing without surgery. The trial supports reverse arthroplasty as a reasonable option for carefully selected very elderly patients, particularly when fracture complexity and cuff dysfunction make fixation or reliable tuberosity healing difficult. At the same time, treatment should not be reduced to age alone. Surgical risk, pre-injury function, frailty, expectations and the feasibility of rehabilitation remain central to decision-making. The study is useful because it places reverse arthroplasty within a comparative framework rather than relying only on case series. For an orthopaedic surgeon, the practical takeaway is to consider reverse arthroplasty when the fracture pattern is unlikely to deliver predictable function with conservative care, while still individualising the decision according to patient biology and goals.