Yep.
I had a whole lot of blood sucked out of my knee the first of 3 times that I busted chunks of cartilage off of my femur. They just shove in a big needle. Hurts like a motherfucker but very worth it because it feels so much better afterwards.
Not really sure why they’re saying you “have” to get it done though. The other 2 times I just rocked out with a swollen knee for a couple weeks waiting for surgery. The blood just gets reabsorbed. :gotme: