 This study found that the combination of ropivocaine and fentanyl did not provide any additional benefit over ropivocaine alone when administered during a femoral nerve block for total nearthroplasty. However, the use of this combination resulted in less hydromorphone consumption and fewer side effects than using ropivocaine alone. This article was authored by Gunny Kim, Joon Woo Lee, Go Won Kim and others.