Peters RM, van Steenbergen LN, Stewart RE, et al. - Given that patient characteristics can impact outcome and survival following primary total hip arthroplasty (THA), researchers used the Dutch Arthroplasty Register and assessed the impact of case-mix on revision following primary THA. This study included a cohort of 218,214 primary THAs performed in patients with osteoarthritis in the Netherlands between 2007 and 2018. Age, gender, American Society of Anesthesiologists [ASA] score, body mass index [BMI], Charnley score, smoking, and previous operations to the hip were different patient features that were taken into account. Findings revealed an influence of case-mix factors on short-term risk for revision following primary THA. One-year revision post-primary THA was most strongly predicted by ASA score and BMI (especially > 40). Following 3 years, BMI and past hip surgery were identified as independent risk factors for revision.