God is Great! This morning, Christy was able to remove the BI-PAP breathing apparatus! Her O2 levels are holding at 96-100% w/o the breathing help. What a blessing! She is mostly responsive, even though she's still a little loopy! We haven't talked to any docs yet this morning, so we don't know any further prognoses regarding the infection or the knee. I'll keep you updated throughout the day.
Thank everyone for your prayers and thoughts! They're working!