An observational study of the effect of femoral nerve block in addition to an adductor canal block for pain following 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.
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
TREATMENT
Masking
TRIPLE
Enrollment
16
15 ml of 2% chloroprocaine was placed under ultrasound guidance adjacent to the femoral nerve in the operative limb.
15 ml of normal saline was placed under ultrasound guidance adjacent to the femoral nerve in the operative limb.
Duke University Hospital
Durham, North Carolina, United States
Pain Intensity as Measured by 11-point Verbal Numeric Rating Scale (NRS-11) for Pain.
Pain intensity prior to intervention and at 5 minute intervals after intervention. The 11-point Numeric Rating Scale quantifies a subject's pain experience from 0/10 (no pain) to 10/10 (worst pain imaginable).
Time frame: Baseline, up to 30 minutes.
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