Partridge TCJ, Charity JAF, Sandiford NA, et al. - Patients undergoing simultaneous bilateral total hip arthroplasty (SimBTHA) were compared with those undergoing staged bilateral total hip arthroplasties (StBTHAs) in terms of morbidity and mortality. Using Hospital Episode Statistics data, researchers assessed a total of 2,507 patients who underwent SimBTHAs and 9,915 patients who underwent StBTHAs. Patients undergoing SimBTHA were significantly younger (60.6 vs 65.5 years) and more frequently male, but had similar Charlson comorbidity scores. Data suggest a greater risk of pulmonary embolism, myocardial infarction, renal failure, chest infection, and in-hospital death among patients undergoing SimBTHAs vs StBTHAs. Patients undergoing SimBTHAs had a significantly shorter overall hospital stay (8.9 vs 10.4 days) and undergoing SimBTHA at high-volume units vs low-volume units was related with a lower average Charlson score and subsequent complication rate. These findings suggest that in England, SimBTHA in patients with Charlson score greater than 0 performed at lower-volume centers is associated with greater risks.