The orthogeriatric concept. (A) Increasing risk related to anesthesia/surgery versus comorbidities in young patients, elderly healthy patients (i.e., elderly patients with harmonious aging process without significant comorbidities), and “geriatric patients (i.e., elderly patients with several comorbidities). (B) Four designs of orthogeriatric cooperation have been proposed in the literature with increasing participation of the geriatrician and decreasing participation of the surgeon (from 1 to 4). The Unit for PostOperative Geriatric (UPOG) care belongs to the last one.