Inflammatory Indices, Early Mortality, and ICU Stay in Geriatric PFN Patients (PFN-RAR)

Hip fractures are associated with substantial morbidity and mortality in the geriatric population. Intertrochanteric femur fractures, in particular, frequently require surgical stabilization with proximal femoral nailing (PFN). Despite advances in perioperative care, early postoperative mortality rates and intensive care utilization remain high in elderly patients undergoing PFN surgery. Identifying reliable biomarkers that reflect the acute systemic inflammatory response to surgical trauma may improve perioperative risk stratification and postoperative management.

In recent years, several hematologic inflammatory indices derived from routine laboratory parameters have emerged as potential prognostic markers in different clinical settings. These include neutrophil-to-lymphocyte ratio (NLR), platelet-to-lymphocyte ratio (PLR), monocyte-to-lymphocyte ratio (MLR), systemic immune-inflammation index (SII), systemic inflammation response index (SIRI), aggregate index of systemic inflammation (AIS), immune-inflammatory prognostic index (IPI), and red cell distribution width-to-albumin ratio (RAR). However, data regarding the prognostic significance of these inflammatory indices in geriatric orthopedic trauma patients remain limited.

This retrospective observational cohort study evaluates the association between preoperative and postoperative inflammatory indices and early postoperative outcomes in geriatric patients undergoing PFN surgery for intertrochanteric femur fractures. Electronic medical records of eligible patients aged 65 years and older will be reviewed retrospectively. Demographic characteristics, comorbidities, perioperative laboratory findings, inflammatory indices, 30-day mortality, and intensive care unit (ICU) length of stay will be analyzed.

The primary outcome of the study is 30-day mortality. The secondary outcome is ICU length of stay. The study aims to determine whether inflammatory indices, particularly RDW-to-albumin ratio (RAR), are independently associated with early mortality and prolonged ICU stay in the acute postoperative period. The findings may contribute to the identification of simple and cost-effective biomarkers for early risk assessment in geriatric hip fracture patients.