Femoral Versus Adductor Canal Continuous Peripheral Nerve Blocks for Knee Arthroplasty

Exclusion Criteria

• •1. morbid obesity as defined by a body mass index \>40 (BMI=weight in kg/ \[height in meters\]
• •2. chronic, high-dose opioid use (greater than 20mg oxycodone-equivalent opioid use daily within the 2 weeks prior to surgery and duration of use \>4 weeks)
• •3. history of opioid abuse
• •4. allergy to study medications
• •5. known renal insufficiency (creatinine \> 1.5 mg/dL)
• •6. pregnancy
• •7. incarceration
• •8. any known neuro-muscular deficit of the ipsilateral femoral nerve, obturator nerve and/or quadriceps muscle (including diabetic peripheral neuropathy); and inability to ambulate 30 m preoperatively.