Enhanced Predictive Accuracy of the Revised Risk Analysis Index Over the 5-Factor Modified Frailty Index for Postoperative Outcomes in Olecranon Fractures

Objective To compare the predictive accuracy of the Risk Analysis Index (RAI) versus the 5-factor Modified Frailty Index (mFI-5) for postoperative outcomes in olecranon fracture open reduction internal fixation (ORIF).

This retrospective study analyzed 3,987 patients from the ACS-NSQIP database who underwent olecranon ORIF between 2015-2020. Outcomes included 30-day mortality, non-home discharge (NHD), complications, readmission, and extended length of stay. Predictive accuracy was assessed using area under ROC curves (AUROC).

RAI demonstrated superior predictive accuracy for NHD (AUROC: 0.81 vs 0.68, p<0.001), major complications (AUROC: 0.72 vs 0.65, p=0.05), and reoperation (AUROC: 0.63 vs 0.57, p=0.03) compared to mFI-5. Severely frail patients identified by RAI showed significantly increased odds for NHD (OR: 4.78, p=0.005), extended length of stay (OR: 2.83, p=0.008), and major complications (OR: 9.23, p=0.03). No significant differences were found between indices for mortality, minor complications, or readmission rates.

The RAI demonstrates superior discriminatory accuracy compared to mFI-5 for predicting adverse outcomes after olecranon ORIF, particularly for NHD and major complications. Implementation of RAI in preoperative assessment may improve risk stratification and resource allocation for olecranon fracture patients. Competing Interest Statement The authors have declared no competing interest. Funding Statement The author(s) received no specific funding for this work. Author Declarations I confirm all relevant ethical guidelines have been followed, and any necessary IRB and/or ethics committee approvals have been obtained. Yes The details of the IRB/oversight body that provided approval or exemption for the research described are given below: Ethics Statement: This study utilized the American College of Surgeons National Surgical Quality Improvement Program (ACS-NSQIP) database, which is a de-identified, publicly available dataset. As such, this study did not involve direct interaction with human participants and did not require Institutional Review Board (IRB) approval. Participant consent was not required, and the need for informed consent was waived by the data provider due to the de-identified nature of the dataset, in accordance with institutional and national guidelines. I confirm that all necessary patient/participant consent has been obtained and the appropriate institutional forms have been archived, and that any patient/participant/sample identifiers included were not known to anyone (e.g., hospital staff, patients or participants themselves) outside the research group so cannot be used to identify individuals. Yes I understand that all clinical trials and any other prospective interventional studies must be registered with an ICMJE-approved registry, such as ClinicalTrials.gov. I confirm that any such study reported in the manuscript has been registered and the trial registration ID is provided (note: if posting a prospective study registered retrospectively, please provide a statement in the trial ID field explaining why the study was not registered in advance). Yes I have followed all appropriate research reporting guidelines, such as any relevant EQUATOR Network research reporting checklist(s) and other pertinent material, if applicable. Yes Data Availability The data underlying the results presented in this study are available from the American College of Surgeons National Surgical Quality Improvement Program (ACS-NSQIP). The dataset is available to researchers through a formal application process at https://www.facs.org/quality-programs/data-and-registries/acs-nsqip/participant-use-data-file/. The authors do not have permission to share the dataset directly.