I've used chloroprocaine for our semi-same day total joints at the ASC, but found knees in particular are pretty uncomfortable when they hit the pacu and we are playing catch up. our preop cocktail with po meds and block is similar to lakersbaby. We are often using 5-7mg of 0.5% isobaric bupiv for TKA and THA. They are wiggling toes well upon PACU arrival, leaving within 1-2h after PACU arrival (the spinal has to resolve prior to leaving the facility), and with a slower onset of pain that's easier to get ahead of. As far as I can remember, I've never had to place an LMA because of the spinal wearing off. But we have very reliable and speedy surgeons who almost all operate in a 1-1.5h timeframe.