Factors associated with selection of total hip arthroplasty versus hemiarthroplasty for femoral neck fracture in older adults: a nationwide analysis of 99,084 cases.

BACKGROUND: Surgical management of displaced femoral neck fractures in older adults typically involves hemiarthroplasty or total hip arthroplasty (THA). Although clinical guidelines suggest that THA may be considered in selected healthier and cognitively intact patients, real-world procedure selection varies widely. This study evaluated patient factors associated with selection of THA versus hemiarthroplasty in a contemporary U.S. METHODS: A retrospective cohort study was conducted using the 2022 Nationwide Readmissions Database (NRD). Patients ≥ 65 years hospitalized with femoral neck fracture were identified using ICD-10-CM codes. Those treated with internal fixation or non-arthroplasty procedures were excluded. Weighted analyses characterized demographics, comorbidities, and hospital utilization between THA and hemiarthroplasty groups. A multivariable logistic regression model identified factors independently associated with receiving THA. All analyses accounted for NRD survey design. RESULTS: Among 142,013 operative cases, 99,084 met inclusion criteria (81.8% hemiarthroplasty; 18.2% THA). Patients receiving THA were younger (76.6 vs. 81.9 years), had shorter length of stay (6.06 vs. 7.24 days), and were more frequently discharged home (17.5% vs. 6.2%). Metabolic conditions were associated with increased odds of THA, including obesity (OR 1.17) and sleep apnea (OR 1.12). Frailty-related conditions were associated with markedly reduced THA likelihood, including Alzheimer's disease (OR 0.48), Parkinson disease (OR 0.55), chronic kidney disease (OR 0.78), chronic lung disease (OR 0.72), and congestive heart failure (OR 0.77). Each additional year of age decreased the odds of THA by approximately 9%. CONCLUSION: In this nationwide cohort, selection of THA rather than hemiarthroplasty was associated with younger age and lower prevalence of frailty- and cognition-related comorbidities, while several metabolic comorbidities showed modest positive associations with THA use. These findings describe contemporary national selection patterns but do not establish treatment appropriateness, clinical benefit, or guideline concordance, as key factors such as pre-fracture mobility, functional independence, and living situation were not available in the dataset. LEVEL OF EVIDENCE: Level III.