10/20/2026
That bulge behind her knee? 55 cc of fluid.
This is a Baker cyst, a fluid-filled sac behind the knee that forms when the joint overproduces fluid, often from arthritis or a meniscus tear. Her left knee is shown for comparison.
Under ultrasound guidance, we placed a needle directly into the cyst and drained 55 cc of straw-colored fluid. In-office, no incision.
Right after: full knee bend, minimal to no pain.
Draining relieves the pressure. Treating the cause is what keeps it from coming back, and that’s the next step in her plan.
Swelling or tightness behind your knee?
Loop Medical Center, South Loop, Chicago.
Book via link in bio or [email protected]
