Optimizing Local Anesthetic Concentration for Continuous Femoral Nerve Blocks

Total Knee Arthroplasty Clinical Trial

Official title: Optimizing Local Anesthetic Concentration for Continuous Femoral Nerve Blocks

Status Completed

Clinical Trial Summary

This is a randomized, observer-masked, controlled study. Subjects will be patients undergoing bilateral total knee arthroplasty (TKA). One side (left or right) will be randomized to one of two treatment groups: a postoperative ropivacaine concentration of 0.1% or 0.4%. The contralateral side will receive the other possible ropivacaine concentration of 0.1% or 0.4%. The basal rate and patient-controlled bolus volume will depend upon the treatment group, but the total dose of local anesthetic is the same for each. For the duration of the study, all patients will receive the current usual and customary analgesics for bilateral TKA patients. All patients will receive a ropivacaine perineural infusions initiated in the operating room and continued until at least the afternoon of postoperative day (POD) 2, as well as oral acetaminophen, a sustained-release oral opioid; and celecoxib. Rescue opioid and route of administration will be determined by pain severity using a Numeric Rating Scale of 0-10, with 0 equal to no pain and 10 being the worst imaginable pain.

Clinical Trial Description

The investigators propose to test the null hypothesis that differing concentrations of ropivacaine (0.1% vs. 0.4%) at an equal total dose has no impact on quadriceps muscle strength during a continuous femoral nerve block following total knee arthroplasty (TKA). These results will help define the optimal concentration of local anesthetic used for continuous peripheral nerve blocks. ;

Related Conditions & MeSH terms

• Knee Pain
• Total Knee Arthroplasty

• NCT number: NCT00923598
• Study type: Interventional
• Source: University of California, San Diego
• Status: Completed
• Phase: Phase 4
• Start date: June 2009
• Completion date: April 2011