Abstract:

Objective　To explore the possible anatomic factors on forming the popliteal cysts.　Methods　30 adult knee-specimens were dissected and measured.(1)To observe the occurrence of the gastrocnemius semimembranosus bursa (GSB), and explore the relationship of GSB and knee articular cavity; (2) To dissect and observe the channel between GSB and knee articular cavity; (3)To inject physiological saline into joint, and observe whether physiological saline reached to GSB as the result of articular cavity pressure rising.    Results　 (1) GSB was observed in all specimens, and 40% (12 specimens) GSB communicated with knee articular cavity by a channel.(2) Joint fluid appered in GSB following the increased articular cavity pressure.　Conclusions　The gastrocnemius semimembranosus bursa is anatomical basis for forming popliteal cyst.

Key words: Knee joint, Popliteal cysts, Anatomy