Functional status and readmissions in unilateral hip fractures

Area of Science:

• Rehabilitation Medicine
• Geriatric Medicine
• Health Services Research

Background:

• Hip fractures are a common cause of disability in older adults, often requiring inpatient rehabilitation.
• Predicting acute care readmission risk after inpatient rehabilitation facility (IRF) discharge is crucial for patient outcomes and healthcare resource management.

Purpose of the Study:

• To determine if functional status is a reliable predictor of acute care readmission risk in patients discharged from an IRF after a unilateral hip fracture.
• To compare the predictive performance of functional status-based models with models incorporating medical comorbidities.

Main Methods:

• Retrospective analysis of a large administrative dataset (Uniform Data System for Medical Rehabilitation) from 2002-2011.
• Inclusion of patients with unilateral hip fractures discharged to an IRF.
• Comparison of a basic prediction model (functional status) against models including comorbidities using C statistics.

Main Results:

• Analysis of 433,154 patients revealed a 7.87% readmission rate to acute care.
• The basic model predicting readmission based on functional status showed moderate performance (C statistics ranging from 0.667 to 0.710).
• Models incorporating comorbidities, particularly the Age+Elixhauser Model, demonstrated improved predictive accuracy compared to the basic model.

Conclusions:

• Functional status is a significant and potentially modifiable risk factor for acute care readmission in hip fracture patients discharged to IRFs.
• While functional status is important, integrating comorbidity data enhances the prediction of readmission risk.
• These findings can inform targeted interventions to reduce readmissions in this patient population.