Risk factors associated with subtalar fusion within 5 years following calcaneal ORIF.

Background: Although most calcaneal fractures are managed with open reduction internal fixation (ORIF), they can ultimately lead to subtalar arthritis and pain requiring subtalar fusion when conservative treatments prove ineffective. Understanding the risk factors associated with subtalar fusion (STF) after calcaneal ORIF is crucial for optimizing patient outcomes and treatment strategies. This study aimed to comprehensively evaluate these risk factors and their association with the incidence of STF, including patient demographics, medical comorbidities, same day and 90-day reimbursement data.

Methods: A retrospective analysis was performed using the PearlDiver Mariner 157 national claims database from January 1st, 2010 to October 31st, 2021. Patients who underwent calcaneal ORIF, identified using Current Procedural Terminology (CPT) and ICD Procedure Codes were queried for 5-year rates of STF and reimbursement data. Patient demographics and comorbidities were recorded, and multivariate logistic regression was employed to determine the association of risk factors with STF.

Results: Patients with STF had a higher proportion of alcohol abuse (21.3 % vs. 16.2 %), depression (58.1 % vs. 43.1 %), drug abuse (29.1 % vs. 19.7 %), obesity (40.3 % vs. 28 %) and tobacco use (62.2 % vs. 50.3 %), all exhibiting a p-value of less than 0.001. Those with depression (OR: 1.54; 99 % CI:1.29-1.84; P < 0.001) and obesity (OR:1.58; 99 % CI: 1.32-1.88; P < 0.001) as comorbidities had a higher odds ratio of association with STF following calcaneal ORIF.

Conclusion: Patients who ultimately require STF within 5 years of calcaneal ORIF had higher rates of alcohol abuse, tobacco use, drug use, obesity, and depression. There was no significant difference observed between those with and without STF in average same-day and 90-day reimbursements and demographics.