Overview: When most people think of a shoulder, more than likely they think of the part of the human body where the arm attaches to the torso. While this is not inaccurate, it doesn’t even begin to describe the intricate complex of muscles, bones, ligaments and tendons that come together to create not only the most mobile, but also the most commonly injured joints in our body, and that work together to make it possible for us to do everything from pushing and pulling to lifting, reaching, shrugging, throwing and hugging, not to mention keeping ourselves balanced whenever we walk or run.