Ropivacaine 0.1% versus 0.2% for continuous lumbar plexus nerve block infusions following total hip arthroplasty: a randomized, double blinded study.

Objective: Continuous lumbar plexus blocks provide excellent analgesia for total hip arthroplasty (THA), but their utility has been questioned as they may increase motor weakness. The aim of this study was to compare the efficacy of two different concentrations of ropivacaine on both postoperative analgesia and motor function.

Methods: Thirty patients were examined in this prospective, single center, double-blinded, parallel group, comparative, randomized controlled trial in patients undergoing primary THA.