Muscles Acting on the Knee Joint
Flexors (posteriorly) - biceps femoris, semitendinosus, semimembranosus, sartorius, gracilis, popliteus, gastrocnemius
Extensors (anteriorly) - rectus femoris, vastus medialis, vastus lateralis, vastus intermedius
Internal rotators - popliteus, semimembranosus, semitendinosus
External rotators - biceps femoris, sartorius
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