воскресенье, 26 марта 2017 г.

The knee is a hinge joint that moves the lower leg forward and backward. These motions are called flexion and extension; they are caused from the contraction of several leg muscles.


The knee is a hinge joint that moves the lower leg forward and backward. These motions are called flexion and extension; they are caused from the contraction of several leg muscles.

Original article and pictures take https://livestrong.com site

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