This study or clinical trial looking to compare 2 types of freezing medications injected into the spinal fluid at the lower back between the vertebrae in patients going to have total knee replacement surgery to check for early legs movement, early discharge from recovery room, walking and hospital discharge. This could save hospital cost of such procedures.
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Time to complete recovery of motor block
Timeframe: Time from the intrathecal drug injection to the first documented instance of complete motor block recovery Bromage 0. Within approximately 2 hours for the Chloroprocaine group and 4 hours for the Mepivacaine group.
Time to complete motor block recovery of lower limbs after spinal anesthesia
Timeframe: From the time of intrathecal drug injection to PACU discharge. Within approximately 3 hours for the Chloroprocaine group and 5 hours for the Mepivacaine group.