Analgesic Value of Adductor Canal vs Femoral Block After Total Knee Arthroplasty

Subjects undergoing total knee arthroplasty will receive a preoperative adductor canal block
with continuous catheter. Following a standardized general anesthetic for the procedure,
subjects will be asked to rate their pain using the NRS-11 pain scale in the recovery room.
Once the pain is reported at a 5/10 or above, a femoral nerve block will be performed using
either 2% chloroprocaine or saline placebo (randomized). Pain scores are then evaluated over
the next 30 minutes by a blinded investigator to determine if the femoral block adds any
additional analgesic benefit over an adductor canal block.

Inclusion Criteria:

- Patients scheduled for elective total knee arthroplasty

- ASA Physical Status I-III

- BMI 18-40 kg/m2

Exclusion Criteria:

- Inability to cooperate with protocol

- Inability to understand or speak English

- Allergy to any local anesthetic

- Chronic opioid consumption/abuse (30 or more morphine mg equivalents/day)

- Contraindication to adductor canal or femoral nerve block