Popliteal (Baker’s) Cyst: Pathogenesis and clinical findings

Popliteal (Baker’s) Cyst: Pathogenesis and clinical findings
Idiopathic
Meniscal Lesions Osteoarthritis
Rheumatoid Arthritis
Cyst between medial head of gastrocnemius and semimembranosus tendon
Popliteal (Baker’s) Cyst 1` fluid in popliteal bursa
Authors: Megan Ure Reviewers: Reza Ojaghi Usama Malik Dr. Carol Hutchison* * MD at time of publication
Cysts with joint communication flow of fluid between knee joint and bursa “valve” opens “valve” closes Negative during flexion. during extension. during t flow into joint 4, flow out of bursa /j` flow into Cysts without joint Variable intra-articular knee pressure pressure Positive pressure Repeated small flexion. during extension. to bursa resulting joint 1` flow into bursa muscle contraction communication Notes: • Popliteal cysts are rare in children and are often • idiopathic and asymptomatic trauma with no communication with from the joint, therefore sometimes we consider aspiration. • Popliteal cysts in adults are often associated with intra-articular knee lesions. Therefore, we manage the pain) underlying joint disease. We never aspirate/ excise the Baker’s cyst with underlying joint disease as it will just come back. Rupture intense Volume Mass in Posterior Knee (abrupt and 1` Calf Posterior Knee Pain/Pressure worse with extension or physical activity