In-hospital outcomes of fibromyalgia patients undergoing primary total hip arthroplasty: a seven-year United States National Inpatient Sample propensity-matched analysis.

Exclusions included fracture, revision arthroplasty, infection, malignancy, inflammatory arthritis, COVID-19, and non-elective admissions.

A 1:1 nearest-neighbor propensity score match without replacement (caliper 0.2 SD of logit) balanced demographics, comorbidities, and hospital characteristics.

From 1,957,284 total hip arthroplasty patients, 40,825 (2.1%) had fibromyalgia.

Post-match (n = 81,650), groups were well balanced (all standardized differences < 0.10).