Baker's cyst

Overview

A Baker's cyst is usually the result of knee-joint conditions, such as arthritis or torn cartilage, that cause the knee to produce too much lubricating fluid.

Symptoms

Symptoms, when they occur, may include a bulge and tight feeling behind the knee.

Treatments

Treatment, if needed, involves treating the underlying condition. Other options include a cortisone injection, fluid drainage with a needle, or physical therapy.