Many docs do so..
I agree with dr. Namey that rheumatologists and orthopedists do joint aspirations, but also i would like to add that many other docs do so as well-family and internal medicine
, for examples.
I do this all the time, something I am well trained to do and enjoy doing the procedure--aspirations and injections!
consult your doc..If he/she does not do it, u will be referred to one who does. Good luck.