Small bursae lie at the origins of both gastrocnemius heads at the posterior femoral condyles. The medial gastrocnemius bursa can communicate with the knee joint and represents the additional contribution to posterior knee cysts alongside the semimembranosus-gastrocnemius bursa. These bursae become relevant in posterior knee pain assessment when posterior knee cysts are evaluated.
Reduces friction between the gastrocnemius heads and the posterior femoral condyles during knee movement
The medial gastrocnemius bursa contributes to the semimembranosus-gastrocnemius bursal complex that produces Baker cysts. Distinguishing isolated gastrocnemius bursitis from a semimembranosus bursa or a joint-communicating Baker cyst requires ultrasound or MRI assessment of the bursal anatomy and joint communication.
Posterior knee bursal inflammation from gastrocnemius origin compression producing posterior knee pain managed with activity modification and targeted injection.
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