Knee joint: Extracapsular ligaments and popliteus muscle (posterior view) (English)

Right knee, capsule in situ. The articular capsule extends posteriorly between the intercondylar line of the femur to the posterior border of the tibial plateau. It strengthened posteriorly by the arcuate and oblique popliteal ligaments, medially by the tibial collateral ligament and laterally by the fibular collateral ligament. The popliteus muscle provides additional stabilization to the knee joint as it ascends superolaterally across its posterior aspect. Its tendon enters the lateral part of the articular capsule, deep to the arcuate popliteal ligament, therefore making it an intracapsular structure.