How effective is joint aspiration for knee bursitis?

A clinician uses a needle to remove fluid from the bursa, the small cushion over or around the kneecap. This can ease tightness and make bending or kneeling more comfortable. The withdrawn fluid may be examined when infection, bleeding, or crystal inflammation is a concern. Aspiration treats the collection of fluid; it does not remove the irritation that caused it. Repeated kneeling, a blow, skin infection, or an inflammatory condition can allow swelling to return.

Tell the clinician about blood-thinning medicines, diabetes, skin problems, fever, and any recent injury. Afterward, follow the advised dressing and activity plan, keep pressure off the front of the knee, and watch whether swelling, redness, or pain changes. A compression wrap, rest from kneeling, and treatment of the underlying irritation may be recommended. Do not try to drain the bursa yourself.

Seek prompt medical assessment for a rapidly enlarging swelling, increasing warmth or redness, fever, chills, pus, severe pain, or difficulty moving the knee. These features can occur with an infected bursa and need assessment rather than relying on aspiration alone. After the procedure, worsening pain, spreading redness, drainage, or fever also warrants prompt contact with a clinician.

Could the fluid be tested for infection, blood, or crystals? What activity may have triggered the bursitis? How will we reduce the chance of the swelling returning? What symptoms after aspiration should make me call the clinic?