popliteus

/pɑpˈlɪtiəs/
noun
  1. A small muscle at the back of the knee that helps bend the knee and rotate the lower leg.
    • The popliteus muscle is important for unlocking the knee when you start to walk.
    • Physical therapy exercises can strengthen the popliteus after a knee injury.
    • Runners sometimes strain their popliteus if they run on uneven ground.
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