Three Different Approaches for Ultrasound Guided Femoral Nerve Block for Patients Undergoing Total Knee Arthroplasty

A Randomized, Single Blind Study of the Efficacy and Safety of Three Different Approaches for Ultrasound Guided Femoral Nerve Block for Patients Undergoing Total Knee Arthroplasty

Patients scheduled to have a surgery for Total Knee Arthroplasty will be assigned to one of three groups, each group will use a different approach using the ultrasound to guide the femoral nerve block as part of their treatment for controlling pain post-operatively.

This will be a prospective, single-blinded, randomized study. The patients will be randomly assigned to one of three groups:

Group I - single shot femoral nerve block Group II - continuous femoral nerve block - non stimulating catheter Group III - continuous femoral nerve block - stimulating catheter

Inclusion Criteria:

• 18- 90 years old
• Scheduled for total knee arthroplasty

Exclusion Criteria:

• Redo surgery on the same knee
• BMI ≥45
• Radicular pain in the same leg
• Allergy to local anesthetics
• Opioid habituation
• Pregnancy
• Contraindication to regional block
• Inability to communicate with hospital staff or investigators.
• Neuropathy of any etiology in the surgical extremity.