I’ve had liquid drained from my knee 3 times.
1st time overshot a table top snowboarding and landed on my knee, bruised up instantly and looked like and felt like shit. Drained the next day and it was like new.
2nd time, was warming up for a soccer game, took a shot and the goalie stepped on my foot, hit knee to knee and I turned my knee cap spun around to the back dislocating it. Doc popped it in and I had 2 return visits to get it drained. Yum.
It def has an initial weird feeling, but then when it gets drained mmm everything just feels great.