A Comparison of Open Carpal Tunnel Release Outcomes Between Procedure Room and Operating Room Settings

PURPOSE: Carpal tunnel release (CTR) surgical costs are minimized when performed in the procedure room (PR) setting, compared with the operating room. However, it remains unclear whether outcomes differ between surgical settings. Our purpose was to compare outcomes at 1 year or greater follow-up after open CTR between patients treated in PR versus operating room settings using the Boston Carpal Tunnel Questionnaire (BCTQ). METHODS: A change in clinical care protocols at our institution occurred in 2014. Before this, all CTRs were performed in the operating room; thereafter, these were transitioned to the PR. Adult patients who underwent isolated unilateral or bilateral open CTR in either surgical setting were considered for inclusion, in which procedures were conducted between January 2014 and October 2018 for the PR group and January 2009 and March 2014 for the operating room group. The Functional Status Scale (FSS) and the Symptom Severity Scale (SSS) components of the BCTQ were collected for all eligible patients at a minimum of 1 year after surgery. We used univariate and multivariable linear regression to determine whether postoperative BCTQ scores were equivalent between PR and operating room groups within a threshold of one-fourth of the lowest estimates of the minimal clinically important difference. RESULTS: No differences in demographics, comorbidities, or insurance type were observed between the 104 PR and 112 operating room patients. Survey response rate was 25% and 25% for the PR and operating room patients, respectively. At a mean follow-up of 3 ± 1 years, FSS and SSS scores were equivalent between PR and operating room groups on bivariate analysis. The multivariable equivalence test also demonstrated equivalent FSS and SSS scores between PR and operating room groups within a one-fourth minimal clinically important difference threshold while controlling for age, sex, presence of diabetes or thyroid disease, unilateral versus bilateral CTR, and surgeon. CONCLUSIONS: Clinical outcomes did not differ between PR and operating room settings after open CTR. TYPE OF STUDY/LEVEL OF EVIDENCE: Therapeutic III.