Public Insurance Is Associated With Decreased Rates of Surgical Management for Glenohumeral Instability: An Analysis of the Rhode Island All-Payers Claims Database.

BACKGROUND: Socioeconomic status has been shown to influence patients' ability to access health care.

PURPOSE: To evaluate the socioeconomic status and/or insurance provider of patients and to determine whether these differences influence the management of shoulder instability.

STUDY DESIGN: Descriptive epidemiology study.

METHODS: The Rhode Island All-Payers Claims Database (APCD) was used to identify all patients between the ages of 5 and 64 years who made an insurance claim related to a shoulder instability event between January 1, 2011, and December 31, 2019. Chi-square analysis and multivariate logistic regression were utilized to determine whether insurance status, social deprivation index (SDI), or median income by zip code were significant predictors of treatment methodology and recurrent instability. Kaplan-Meier failure analysis and Cox regression were used to assess for variation in the cumulative rates of surgical intervention and recurrent instability over 20-year age groups (5-24, 25-44, and 45-64 years).

RESULTS: There were 3310 patients from the APCD query included in the analysis. Bivariate analysis demonstrated significant variation in the rates of surgical stabilization between patients with public and commercial insurance providers ( P < .001). Patients with public insurance received surgery 1.8% of the time compared with 5.8% of the time in patients with commercial insurance. After controlling for recurrent instability, age, instability type (subluxation or dislocation) and directionality, and sex, patients with public insurance were 79% less likely to receive surgery within 30 days ( P = .035) and 64% less likely to receive surgery within 1 year ( P = .002). This disparity was most notable in the 5- to 24-year (hazard ratio [HR] = 0.28; 95% CI, 0.13-0.61) and 25- to 44-year (HR = 0.26; 95% CI, 0.08-0.89) age groups. Neither SDI quartile nor income quartile based on patient primary zip code had a clinically significant influence on rates of surgery or recurrent instability.

CONCLUSION: These data demonstrate that patients with public insurance have a decreased likelihood of undergoing surgical stabilization to address glenohumeral instability compared with patients with commercial insurance.