The duration of motor block for infragluteal parabiceps sciatic nerve block following total knee replacement may vary between 12-36 hrs depending on the amount of local anesthetic given.
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
SUPPORTIVE_CARE
Masking
DOUBLE
Enrollment
142
Varying doses to determine the duration of analgesia
Varying doses to determine the duration of analgesia
Northwestern University, Feingberg School of Medicine
Chicago, Illinois, United States
Duration of Motor and Sensory Block of the Sciatic With 0.5% Bupivacaine and Ropivacaine After Ultrasound-guided Nerve-stimulator-Assisted Needle Positioning Beneath the CIEL
Subject reported and investigator measured motor and sensory blockade of the sciatic nerve with less than 10ml of 0.5% bupivacaine and ropivacaine after ultrasound-guided nerve-stimulator-assisted needle positioning beneath the common investing external layer (CIEL).
Time frame: 3 days
Cumulative Probabilities for Needle Positioning Above and Below CIEL.
The cumulative probability distributions for the minimal current to evoke a motor response with the needle tip positioned external (above) to the common investing extraneural layer (CIEL) and the cumulative probability distribution for the needle tip postioned internal (below) to the CIEL were sought. The difference in the mean minimum threshold current (mA) for the external (above) and internal (below) CIEL positioning were calculated.
Time frame: 1 Day
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