Final answer:
To obtain fluid from a joint, the procedure performed is Arthrocentesis, which involves using a needle to puncture a joint's capsule and withdraw synovial fluid for analysis.
Step-by-step explanation:
The procedure performed to obtain fluid from a joint is known as Arthrocentesis. This medical procedure involves using a syringe and needle to puncture a joint's capsule and withdraw synovial fluid.
This fluid can then be analyzed for diagnostic purposes, such as identifying infections, gout, or other joint disorders. The options given refer to different types of centesis: A) Paracentesis, which is the withdrawal of fluid from a body cavity, typically the abdominal cavity; B) Tympanocentesis, the puncture of the tympanic membrane in the ear to drain fluid; C) Pneumonocentesis, a rarely used term that might refer to the puncture of a lung cavity, which isn't a standard procedure. Hence, the correct answer is D) Arthrocentesis, as it specifically relates to joint fluid aspiration.