Swelling right knee with fluid

by Manny Hej
(West palm Beach, FL)

I had my right knee swollen for 2 month, X-Ray and MRI show no tear, Orthopedic doctor aspirated the fluid and injected cortisone which helped a lot ( 3 times so far). I have had no injury or trauma to my knee. Last time when I hit the couch (not hard) it swelled.

Ice and therapy did not help so doctor had to drain synovial fluid and injected cortisone. Doctor have no answer.

QUSTION: How often (and what negative side effect) can synovial fluid be removed from my knee? Lab showed normal fluid result.