RETRACTED: A New Rule for Femoral Nerve Blocks

Reason: This article has been retracted at the request of the Editor-in-Chief and the primary author Dr. Schulz-Stubner, because the Editorial Board of Regional Anesthesia and Pain Medicine believes the authors have committed scientific misconduct that affects the validity of the study's results and conclusions. The details of the study's experimental design, as presented to peer reviewers and readers of the published article, were misrepresented. Specifically: (1) The authors describe a prospective, randomized trial, but the authors did not concurrently recruit and randomize three distinct groups of patients. Rather, a third group was added after an original two-group trial was complete and this potentially confounding change was not described in the manuscript. (2) The specific definition of the control groups appears to have changed in a manner that suggests group overlap. This change and the true composition of each group were not precisely described in the manuscript. The published manuscript does not describe these significant deviations from sound experimental design and conduct. Any conclusions that might be derived from this work are therefore questionable. For these reasons, the article is retracted; readers are advised not to make clinical decisions based on its content.