The investigators will be comparing the efficacy of two different techniques for performing
an adductor canal block to the saphenous nerve as a part of the multimodal pain control
regimen for total knee arthroplasty. The investigators will be comparing a "low adductor
canal block" in which the surgeon administers local anesthetic to the distal aspect of the
nerve from the operative site to a "high adductor canal block" in which the anesthesiologist
administers the local anesthetic more proximally along the thigh using ultrasound guidance.
The investigators will power the study for non-inferiority to compare the newer "low" block
to the more commonly performed and more widely studied "high" block.