Ardeljan AD, Polisetty TS, Palmer JR, et al. - This study was intended to ascertain whether individuals with pigmented villonodular synovitis (PVNS) of the hip undergoing primary total hip arthroplasty (THA) experience greater in-hospital lengths of stay (LOS), complications, readmission rates, and costs. A nationwide claims registry was used to distinguish individuals undergoing primary THA for PVNS of the hip between the years 2005 to 2014. They compared PVNS patients to a control cohort in a 1:5 ratio by age, gender, and various comorbidities. The data revealed that PVNS of the hip is associated with worse outcomes and higher costs following primary THA without controlling for global trends in LOS, complications, readmissions, or cost between 2005-2014. The study is beneficial as orthopaedic surgeons can use the study to educate individuals of the complications which may occur following their hip surgery.