Prognostic Factors for Mortality in Patients Aged 90 Years and Older with Proximal Femoral Fractures Undergoing Surgery: A Retrospective Study

<b>Background/Objectives:</b> Proximal femoral fractures (PFFs) among individuals aged ≥90 years are becoming more common with an aging population and are associated with high morbidity and mortality. This study analyzed the prognostic factors influencing survival in nonagenarian patients undergoing surgery for PFFs. <b>Methods:</b> We enrolled 285 patients who underwent surgery between 2016 and 2022. Patients were classified into two groups: those with postoperative survival >1 year (L) and those with postoperative survival ≤1 year (D). Factors assessed included age, sex, body mass index (BMI), cognitive impairment, fracture type, surgical timing, length of hospital stay, implant type, preoperative hemoglobin/albumin/white blood cell levels, and Geriatric Nutritional Risk Index (GNRI). <b>Results:</b> The mean age at surgery was 93.2 ± 2.8 years (mean follow-up = 18.9 months). The 12-month mortality rate was 28.8%. Intertrochanteric fractures were observed in 136/47 patients, and femoral neck fractures were observed in 67/35 patients in the L/D group, respectively (<i>p</i> = 0.13). Days from admission to surgery were not significantly associated with mortality (<i>p</i> = 0.56). The mean hospital stay was 17/22 days in the L/D group, respectively. Univariate analysis identified age, BMI, cognitive impairment, albumin level, and GNRI as statistically significant predictors. Multivariate analysis revealed length of hospital stay (odds ratio [OR] = 1.048 [95% confidence interval (CI): 1.019-1.078]; <i>p</i> = 0.001), cognitive impairment (OR = 3.082 [95% CI: 1.367-6.945]; <i>p</i> = 0.007), and GNRI (OR = 0.929 [95% CI: 0.901-0.958]; <i>p</i> < 0.001) as independent predictors of mortality. <b>Conclusions:</b> This study identified cognitive impairment, a low GNRI, and prolonged hospital stay as independent prognostic factors for 1-year mortality in nonagenarian patients with PFFs. These findings highlight the importance of addressing malnutrition and cognitive decline through tailored interventions, alongside optimizing surgical timing and hospital care. A multidisciplinary approach remains essential for improving survival outcomes in this vulnerable population.