The purpose of this study is to determine the feasibility of administering a predetermined amount of normal saline into the intrathecal or subarachnoid space via a small spinal catheter to reduce or eliminate the effects of previously injected spinal anesthetic following lower extremity orthopedic surgery.
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Time to residual motor blockade reversal
Timeframe: Initiation of spinal anesthetic to reversal, up to sixty minutes after removal of catheter.