Evaluation of Utility of Ultrasound Guided iPACK Block for Knee Extension After Total Knee Arthroplasty.

Exclusion Criteria

• •ASA 4 or 5
• •Revision knee arthroplasty
• •Diagnosis of chronic pain
• •Daily chronic opioid use (over 3 months of continuous opioid use)
• •Inability to communicate pain scores or need for analgesia
• •Acute knee dislocation/fracture
• •Infection at the site of block placement
• •Age under 18 years old or greater than 75 years old
• •Pregnant women
• •Intolerance/allergy to local anesthetics
• •Weight \<50 kg
• •Suspected, or known addiction to or abuse of illicit drug(s), prescription medicine(s), or alcohol within the past 2 years.
• •Uncontrolled anxiety, schizophrenia, or other psychiatric disorder that, in the opinion of the investigator, may interfere with study assessments or compliance
• •Current or historical evidence of any clinically significant disease or condition that, in the opinion of the investigator, may increase the risk of surgery or complicate the subject's postoperative course.