Menu Healthy Lifestyle Diseases & Conditions First Aid Symptoms Tests & Procedures Videos Definitions FAQs Baker's cystUpdated: 2017-06-13OverviewA 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. SymptomsSymptoms, when they occur, may include a bulge and tight feeling behind the knee. TreatmentsTreatment, if needed, involves treating the underlying condition. Other options include a cortisone injection, fluid drainage with a needle, or physical therapy. © 1998-2022 Mayo Foundation for Medical Education and Research(MFMER). All rights reserved. Terms of Use